Updating N Rows At Once - Best Practice (again)
Aug 14, 2006
I have put this thread on as a follow up discussion to some concepts that surfaced here:
http://www.dbforums.com/showthread.php?t=1208316
here:
http://www.dbforums.com/showthread.php?t=1604936
and also here:
http://www.dbforums.com/showthread.php?t=1606555
The gist is: Is it ever correct excusable advisable to pass a non-normalised csv list of data to a stored procedure? When I first asked this I thought it was simply an implementation issue. Pat thinks it is but he also holds an ideological objection too.
If I seem a little obsessed with this topic it is simply that
a) I don't want to hijack yet another thread
b) I am
Anyway - I PMed Pat about this and he (quite rightly) suggested I post publicly. So here we go:
I think I have struggled a little getting my head round the concepts you are using. And here (I think) is why:
Normalisation starts with a logical model and ends with the physical implementation of the database (as I see it...). Relational theory pervades these two but extends further to SQL and database objects (views, sprocs etc). I work exclusively (with the exception of some legacy I stuff I simply must update) with the sproc database-API methodology. As such, my databases are abstracted from the other tiers. Now - I think this is the crux of it for me - I typically think of the sproc API as another tier (perhaps tier 1.5). Although the database itself and the objects that manipulate it are housed by a single application I don't actually think of the sprocs as part of the database. They are dependant upon it and inextricably intertwined with it but they are not a part of it in my eyes. As such, I don't worry about producing denormalised output and I have never (up until you got me thinking about it) worried about accepting non-normalised input. The sproc is not the database. The sproc is just a code procedure that acts upon the database. As such - if it accepts a typless, denormalised input but subsequently types (validates) it and normalises it before it makes any changes to the data within the database then I struggle to see the scale of the problem. I am writing as something of a stickler for normalisation myself - I think that rather than querying how closely one should adhere to normalisation principles I am pondering at what point these principles come into play.
As a follow up question - if SQL Server sprocs were to accept (for example) a table variable as an argument would this meet your requirement (since the data is verified and normalised before it gets to the sproc) or would you require a solution like this to be an ANSI Standard too?
So - that's the nub of it - comments welcome on
a) The practicality of passing csv lists to sprocs and subsequently parsing them
and
b) How "correct" or "incorrect" this is.
Blindman and Pat both object on both counts (I think).
Thrasmachus didn't have a problem with it (however to be fair that was a very early response to a specific question I asked).
I don't hold a particularly strong opinion either way – in fact the “loop through the changes at the client and fire the sproc n times” route is probably much easier to code in any case - I'm just interested in the idea that it violates relational theory in some way.
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Jan 16, 2006
Hi I haven't included DDL etc as this is theoretical at this time. I can rustle up an illustrative example if required.Following applies to disconnected environment. In general, most edits are broad (i.e. n fields affected) against a single record. However, there are certain circumstances where a single field will be edited against a deep (n) set of records. So business request:User needs to access and edit n records at a time (for arguments sake n is unlikely to be enourmous - say 50 max) but only editing one single field, and always the same field. The values for this edited field will differ for each record. Initially retrieving data for the app is no problem, nor is identifying those records that have been edited. What is the best means of updating the table? There are, to my mind, three ways of dealing with the latter senario - 1) Client calls the server n times editing a record at the time.2) Client creates a csv string and passes to sproc. Sproc parses string using some UDF split function (probably chucking into table variable) and updates using a single set set based operation.3) Client creates some flat file or other that is BULK inserted (or similar) by SQL Server. 3 - I think would only be an option if n was a very large number and or having the changes immediately reflected in the data is not priority.1 - would create a chatty app and presumably put the most load on the server. So I am left thinking 2 is (depending on circumstances) the best method. Is this fair? Are there any particular considerations gotchas I should be aware of? I know where to get hold of as many TSQL split functions as I could want so I'm not looking for code just opinions. OR - am I just plain wrong? Is there a better alternative or am I dismissing the other two methods prematurely? Thanks in advance
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Jan 9, 2007
I have a need to filter out certain rows from my data stream. I cannot apply the filter against the source data using my DataReader component, due to some constraints in the source system. Therefore, I must filter the data out after it enters my datastream (trust me on this part).
I have created a data flow that uses the Conditional Split transformation to do this. I created one condition that matches the rows I want to discard. I then connected the Default output stream to my target table. I have simply left the "discard" output disconnected. This appear to do what I want.
My question is: is it OK to leave outputs disconnected in this fashion? It isn't really apparent when viewing the package that the conditional split is discarding rows. Is there a better way to handle this situation? For now I've just added an annotation to the package that describes what is happening.
Thanks for any help
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Mar 17, 2008
How would I update a table where id = a list of ids?Do I need to parse the string idList? I am being passed a comma seperated string of int values from a flex application.example: 1,4,7,8 Any help much appreciatedBarry 1 [WebMethod]
2 public int updateFirstName(String toUpdate, String idList)
3 {
4 SqlConnection con = new SqlConnection(connString);
5
6 try
7 {
8 con.Open();
9 SqlCommand cmd = new SqlCommand();
10 cmd.Connection = con;
11 cmd.CommandText = "UPDATE tb_staff SET firstName = @firstName, WHERE id = @listOfIDs";
12
13
14
15 SqlParameter firstName = new SqlParameter("@firstName", toUpdate);
16 SqlParameter listOfIDs= new SqlParameter("@listOfIDs", idList);
17
18
19
20 cmd.Parameters.Add(firstName);
21 cmd.Parameters.Add(listOfIDs);
22
23 int i = cmd.ExecuteNonQuery();
24 con.Close();
25 return 1;
26
27 }
28 catch
29 {
30 return 0;
31 }
32 }
33
34
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Jul 23, 2004
Hi,
I am working on a SQL Server table designed by a partner company and cannot change the data structures. There is a table with a list of people available for calling out to a security system (keyholders).
From a web form, I need to allow my users to change the telephone calling order of the keyholders in the table.
The two important fields are AccountCode nVarChar and CallOrder nVarChar - where AccountCode + CallOrder must be unique.
As an example, the table may contain records with the following data..
1234, 1, Fred
1234, 2, Bert
1234, 3, Bob
If the user wants to make Bob the number 1 keyholder, Fred number 2 and Bert number 3 - what is the best practice for me to approach the update ?
Is this a job for ADO.Net or T-SQL ?
Thanks in advance.
Steve.
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Jul 16, 2002
Does anybody have a sample SQL script that will select table A and compare it to table B. If a row exists in both table A and table B, it will update the columns in table B with the columns in table A. If the row does not exist in table B, it will insert a row in table B using the row in table A. Is this possible?
Thanks Mitch
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Jul 9, 2004
I am new here, and I am sure this is a simple query, but im being forcefed database chores from my job, so i have to teach this stuff to myself/get help from places like this,
I need help with a query,
lets say that there are columns a,b,c,d,e,f,g
if columns c,d,e are the same, than I want the info in column g changed to the info in column b in the first record of that group
the reason I am doing this is,
I have like items (sku's) grouped in my database, and i want to create a blanket part number for skus that have matching descriptions which is the information in colums c,d,e,
I want to link them to the part number of the first product with that description, and add that part number in a new column at the end of the grouped SKU's record
this is what i start out with
a b c d e f g
2 4 5 6 9 8
2 5 5 6 9 9
2 7 5 6 0 5
1 2 3 4 5 6
1 3 3 4 5 7
1 4 3 4 5 8
1 5 3 4 5 9
i want to end up with
a b c d e f g
2 4 5 6 9 8 4
2 5 5 6 9 9 4
2 7 5 6 0 5 7
1 2 3 4 5 6 2
1 3 3 4 5 7 2
1 4 3 4 5 8 2
1 5 3 4 5 9 2
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Apr 10, 2008
Hi, I need to update column week14 in table PastWeeks with data from Eng_Goal and then result of some calculation from table AverageEngTime in the row Goal and Used respectively. I used the following and was not successful. Please advice. Thank you.
Update Pastweeks
set
week14 = (SELECT Eng_Goal,((Mon_Day + Mon_Night + Tue_Day + Tue_Night + Wed_Day + Wed_Night + Thu_Day + Thu_Night + Fri_Day + Fri_Night + Sat_Day + Sat_Night + Sun_Day + Sun_night)* 100/168) FROM AverageEngTime where Shifts = 'Average')
where Weeks = ('Goal','Used' )
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Jul 23, 2005
Hi,New to writing sql scriptI get this error in my sql scriptServer: Msg 512, Level 16, State 1, Line 1Subquery returned more than 1 value. This is not permitted when thesubquery follows =, !=, <, <= , >, >= or when the subquery is used asan expression.The statement has been terminated.I want to write a single sql script which will update column 1 (FK)in table A with column 1 (PK) in table BHere's an example of what I need to doTable DATA_A-------------column C1 (Foreign Key)111111222222333333334455Table DATA_B------------column C1 (Primary Key) Column C2 Column C311 ABC NULL12 ABC 2004-12-1222 EFG NULL23 EFG 2003-12-1233 HIJ NULL34 HIJ 2003-12-1244 KLM 2005-02-0255 JJJ NULLI need to update Table DATA_A set column C1 with 11 data to point toTable DATA_B column C1 with 12 data. Currently, the problem is theTable DATA_A Column C1 is pointing to the wrong primary key which hasNULL data in COLUMN C3. I need to point to the correct Primary Key withDate filled in Column 3. The two primary key is tied together bycolumn C3.Here's my SQl scriptUPDATE DATA_A SET C1 =(SELECT C1 FROM DATA_BWHERE C2 in(SELECT B1.C2 FROM DATA_B B1WHERE EXISTS(SELECT * FROM TABLE_B B2 WHERE B2.C3 is NOT NULL)AND EXISTS(SELECT * from TABLE_B B2 WHERE B2.C3 is NULL)AND B2.C2 = B1.C2GROUP BY B1.C2HAVING COUNT(B1.C2) = 2)AND C3 IS NOT NULL)WHERE(SELECT C1 FROM DATA_BWHERE C2 in(SELECT B1.C2 FROM DATA_B B1WHERE EXISTS(SELECT * FROM TABLE_B B2 WHERE B2.C3 is NOT NULL)AND EXISTS(SELECT * from TABLE_B B2 WHERE B2.C3 is NULL)AND B2.C2 = B1.C2GROUP BY B1.C2HAVING COUNT(B1.C2) = 2)AND C3 IS NULL)Thanks - Been struggle at this for a whileMLR
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Jan 28, 2008
Hi,
I am preparing a project that contains multiple tables, because of huge operations to be performed, so i split these into two forms. I used one form for "Inserting Data in the multiple tables" and another form used for "Updating and Deleting Data from the multiple tables". I used a common identification number in all the tables are "License_Number" for inserting, retreving, updating and deleting the data. I used tabcontrol to place lot of controls on it.
The form-1 which is used for Inserting, works fine.
The problem occuring in the second form which i used for updating.
The following code fill the data into the Textboxes and as well as in the datagridview. Below two tables "SetBack_Details" and "Far_Details" are fill the data in datagridview.
Private Sub FillDataFromAllTables(ByVal LicenseNumber As Long)
Try
'Fill Owner Personal Details Data
CheckOwnerID = RetrieveOwnerIDFromPD(LicenseNumber)
Me.Owner_Personal_DetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.Owner_Personal_Details, CheckOwnerID)
'-------------------------------------------------------------------
'Fill Project Details Data
Me.ProjectDetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.ProjectDetails, LicenseNumber)
'-------------------------------------------------------------------
'Fill Consultant Details Data
Me.Consultant_DetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.Consultant_Details, LicenseNumber)
'Fill Applicant Details Data
Me.Applicant_DetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.Applicant_Details, LicenseNumber)
'-------------------------------------------------------------------
'Fill Property Details Data
Me.Property_DetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.Property_Details, LicenseNumber)
'-------------------------------------------------------------------
Me.SetBack_DetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.SetBack_Details, LicenseNumber)
'-------------------------------------------------------------------
Me.FAR_DetailsTableAdapter.Fill(Me.LicenseFARModifyDataSet.FAR_Details, LicenseNumber)
Catch ex As Exception
MessageBox.Show(ex.Message.ToString, "Project Details")
End Try
End
The data which i retrieves in a single record easily updated but problem occurs in DataGridView.
The data which binds to textboxes is easily updating because of a single record. Example is below
UPDATE PROJECTdETAILS SET PNAME=@PNAME, ZONE=@ZONE, ZONEAREA=@ZONEAREA WHERE LicenseNumber=@LicenseNumber
The data which binds to datagridview is problem. I know the following statement is not appropriate to update the data rows in datagridview.
UPDATE SETBACK_DETAILS SET DIRECTION=@DIRECTION, BORDERS=@BORDERS, DIMENSION=@DIMENSION WHERE LICENSENUMBER=@LICENSENUMBER
What happening to the above statement is , all rows with this LICENSENUMBER contains same data. Before updating data contains in different information but after updating which ever last row is updating, it contains the last row values to all records.
Example :
101 xyzcompany X-Road X-Area
101 xyzcompany X-Road X-Area
101 xyzcompany X-Road X-Area
101 xyzcompany X-Road X-Area
101 xyzcompany X-Road X-Area
.
.
The following code i used to save the data
Private Sub SaveData()
Me.ValidateChildren()
Me.ProjectDetailsBindingSource.EndEdit() 'EndEdit for Project Details
Me.Consultant_DetailsBindingSource.EndEdit() 'EndEdit for Consultant Details
Me.Applicant_DetailsBindingSource.EndEdit() 'EndEdit for Applicant Details
Me.Property_DetailsBindingSource.EndEdit() 'EndEdit for Property Details
'Me.SetBack_DetailsBindingSource.EndEdit() 'Endedit for SetBack_Details
Me.ProjectDetailsTableAdapter.Update(Me.LicenseFARModifyDataSet.ProjectDetails) 'Update Project Details
Me.Consultant_DetailsTableAdapter.Update(Me.LicenseFARModifyDataSet.Consultant_Details) 'Update Consultant Details
Me.Applicant_DetailsTableAdapter.Update(Me.LicenseFARModifyDataSet.Applicant_Details) 'Update Applicant Details
Me.Property_DetailsTableAdapter.Update(Me.LicenseFARModifyDataSet.Property_Details)
'Me.SetBack_DetailsTableAdapter.Update(Me.LicenseFARModifyDataSet.SetBack_Details)
End Sub
Please help me in the regard how to update the data in DataGridView which contains multiple recrods with different information for a single LicenseNumber. I try so many times with different sort of techniques but i fails, sometimes i get concurrency violation error and many more.
Hope anybody understand my problem. Please help me in this regard.
Thanks.
Best Regards,
Kashif Chotu
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Jan 9, 2006
I am using ASP.NET 2.0 WebForms and I was trying to use a DataSet to add rows programatically without adding the actual records to the MS SQL Server Databases. Is this possible or should I be doing this another way?
DataSet myDS = new DataSet();DataTable myTable = new DataTable("table1");myTable.Columns.Add("col1", typeof(string));myDS.Tables.Add(myTable);myTable.Rows.Add("MyValue");
Thanks.
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Dec 26, 2006
OK, I am trying to update a particular column with a numerical number. Here is the query I am using.
UPDATE viewerblock SET dummycat = (?) WHERE dummyproduct = 0
I am trying to number dummycat row to a certain number for example
dummycat-----------------dummyproduct
1--------------------------0
2--------------------------0
3--------------------------0
4--------------------------0
5--------------------------0
6--------------------------0
do you see what i am trying to do? I am simply trying to number the dummycat column where ever dummyproduct = 0.
is this possible to do?
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Jul 2, 2014
I need to update a empty column in our SQL database with the login ID for employees of our company.The table is called SY01200 and were I need to put the login ID is column INET5, and the login ID is just me stripping off the company's email address(removing the @company.com), and I need to update the INET5 column only where Master_Type = 'EMP'
And here is the Query that I am using to strip the email select LEFT(convert(varchar(40),EmailToAddress),LEN(convert(varchar(40),EmailToAddress))-14) As LoginName from sy01200 where Master_Type = 'emp'And here is what I thought the Query would be to update however I got and error saying more than 1 arguement returned
UPDATE sy01200
SET INET5 = (select LEFT(convert(varchar(40),EmailToAddress),LEN(convert(varchar(40),EmailToAddress))-14) As LoginName from sy01200 where Master_Type = 'emp')
WHERE Master_Type = 'EMP'
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Nov 6, 2014
I have a production table with 400 million rows.
I have a staging table which has 48 million rows. This data is the same as the production data, except one column has a different value.
Create Table Production
(
Id Int Identity(1,1),
Code Varchar(20),
ReferenceSequence int
)
-- Staging Table
Create Table Staging
(
Code Varchar(20),
NewSequence int
)
I need to update the production table with the newSequence value from staging to replace the ReferenceSequence. I.e:
Update Production
Set ReferenceSequence = Staging.NewSequence
From Staging
where Production.Code = Staging.CodeHowever, updating 48 million rows at once will generate a lot of logging!
How can I do 1 million rows at a time, commit the changes then do the next million?
I've tried some of the examples on the following page [URL], but they look to just update the tables with the same values.
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Sep 25, 2007
Hi,
I have a table called "tblProducts" with following fields:-
ProductID(Pk, AutoIncrement), ProductCode(FK), ProdDescr.
So to the above table I have added a new field/column named "ProdLongDescr(varchar, Null)"
So, I need to populate this newly added column with specific values for each row depending on "ProductCode" which is different forevery row. The problem is that I have 25 rows.So instead of Writing 25 individual update scripts, is there a way in which single query will do the same job instead of writing one update query for each row ?. If so can some one guide me how to achieve that OR point to me a good resource.
Below are a couple of Individual update scripts I Wrote. "ProductCode" is different for all 25 rows.
Update tblValAdPackageElement SET ProdLongDescr = 'Slideshows' WHERE ProductCode = 'SLID'
And szElementDescr='Slideshow'
if @@error <> 0
begin
goto ErrPos
end
Update tblValAdPackageElement SET ProdLongDescr = 'CategorySlideshows' WHERE ProductCode = 'SLDC'
And szElementDescr='CategorySlideshow'
if @@error <> 0
begin
goto ErrPos
end
Thanks,
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Sep 20, 2007
Hi all..
First of all Thanks for all the help, I received over the years from MSDN..
Here is my new problem...
I have a SQL table like following table..
State
City
StartDt
EndDt
1
AK
ANCHORAGE
4/1/2007
12/31/2049
2
AK
ANCHORAGE
4/1/2007
12/31/2049
3
AK
ANCHORAGE
5/1/2006
3/31/2007
4
AK
ANCHORAGE
5/1/2006
3/31/2007
5
AK
ANCHORAGE
6/1/2004
4/30/2006
6
AK
ANCHORAGE
6/1/2004
4/30/2006
7
AK
COLDFOOT
10/1/2006
12/31/2049
8
AK
COLDFOOT
10/1/1999
12/31/2049
Now here is what I want to do€¦
1> Sort the table based on Start Date (the picture shown is already sorted..) for example first 6 rows for AK - Anchorage
2> select the rows with same city (rows 1-6)
3> Select the rows with distinct start date (rows 1-3-5)
4> Change the End Date of the second selected row (row 3 in this case) to I day below the start date of 1 selected row. (4/1/2007 €“ 1 day = 3/31/2007)
5> proceed till end of selected rows.. 1-3-5
6> do the same thing for rows 2 and 4.
7> follow the same procedure for rest of the file.
The selected file should look like this when done..
State
City
StartDt
EndDt
1
AK
ANCHORAGE
4/1/2007
12/31/2049
2
AK
ANCHORAGE
4/1/2007
12/31/2049
3
AK
ANCHORAGE
5/1/2006
3/31/2007
4
AK
ANCHORAGE
5/1/2006
3/31/2007
5
AK
ANCHORAGE
6/1/2004
4/30/2006
6
AK
ANCHORAGE
6/1/2004
4/30/2006
7
AK
COLDFOOT
10/1/2006
12/31/2049
8
AK
COLDFOOT
10/1/1999
9/30/2006
Is there way to do this in SSIS? any recommened appprach>?
Any help with this is highly appreciated..
Thank You..
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Apr 9, 2008
I have a sql data source that is filtered by a date range. The results are then presented in a Gridview. What I am hoping to do is add a button that will update all the filtered rows in the sql data source. Is this possible?
The data source is shown below:
<asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:MYSTR%>"
SelectCommand="SELECT * FROM [dbo_cheques] WHERE (([chq_banked] >= @chq_banked) AND ([chq_banked] <= @chq_banked2))"
UpdateCommand="UPDATE dbo_cheques SET chq_printed = @chq_printed WHERE (chq_id = @chq_id)">
<SelectParameters>
<asp:ControlParameter ControlID="Calendar1" Name="chq_banked" PropertyName="SelectedDate"
Type="DateTime" />
<asp:ControlParameter ControlID="Calendar2" Name="chq_banked2" PropertyName="SelectedDate"
Type="DateTime" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="chq_printed" />
<asp:Parameter Name="chq_id" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
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May 4, 2000
I need to update about 1.3 million rows in a table of mine.
I am getting the data from one of the columns of the same table and
updating the new column.
I am doing this using a cursor which I have put in a stored procedure.
As this is a production table which users might be accessing.It is a
web based application and I can't slow the system down.
So I am willing to run the stored prcedure during off peak hours.
However, do I need to put this in a transaction?
If I did put it in a transaction what type of isolation level should I
opt for?
Data integrity is very important for me and I don't mind to compromise
on the performance.
I am doing this because one of the columns which has "short description"
entry is has become too small for business purposes and we want to increase it's
length from varchar(100) to varchar(150).
As this is SQL 6.5, I can't increase the lenght of the column.
So Iadded a new column and will run the stored proc.
What precautions are to be taken?
This is on a high priority basis and very important too.
Thanks in advance...
Stored procedure code:
USE DB_Registration_Dev
GO
IF EXISTS (SELECT NAME FROM SYSOBJECTS WHERE NAME='usp_update_product' AND TYPE='P')
DROP PROCEDURE usp_update_product
GO
CREATE PROC usp_update_product
AS
DECLARE @short_desc varchar(100)
DECLARE @prod_id int
DECLARE sdesc_curs CURSOR
FOR
SELECT [Product].[product_id] , [Product].[short_description]
FROM Product
OPEN sdesc_curs
FETCH NEXT FROM sdesc_curs
INTO @prod_id, @short_desc
WHILE @@FETCH_STATUS = 0
BEGIN
UPDATE Product
SET [Product].[sdesc] = @short_desc
WHERE Product_id=@prod_id
FETCH NEXT FROM sdesc_curs
INTO @prod_id, @short_desc
IF @@FETCH_STATUS <> 0
PRINT ' Finished Updating the table...go ahead and have fun ...! '
END
DEALLOCATE sdesc_curs
GO
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Sep 25, 2007
Hi,
I have a table called "tblProducts" with following fields:-
ProductID(Pk, AutoIncrement), ProductCode(FK), ProdDescr.
So to the above table I have added a new field/column named "ProdLongDescr(varchar, Null)"
So, I need to populate this newly added column with specific values for each row depending on "ProductCode" which is different forevery row. The problem is that I have 25 rows.So instead of Writing 25 individual update scripts, is there a way in which single query will do the same job instead of writing one update query for each row ?. If so can some one guide me how to achieve that OR point to me a good resource.
Below are a couple of Individual update scripts I Wrote. "ProductCode" is different for all 25 rows.
Update tblValAdPackageElement SET ProdLongDescr = 'Slideshows' WHERE ProductCode = 'SLID'
And szElementDescr='Slideshow'
if @@error <> 0
begin
goto ErrPos
end
Update tblValAdPackageElement SET ProdLongDescr = 'CategorySlideshows' WHERE ProductCode = 'SLDC'
And szElementDescr='CategorySlideshow'
if @@error <> 0
begin
goto ErrPos
end
Thanks,
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Jul 23, 2005
I'm using a stored proceedure which should update a number of rows in atable depending on a key value supplied (in this case 'JobID'). Butwhat's happening is when I call the proc from within the program, onlyone row gets updated.SoWhen I call the proc from Query Analyser, all rows get updated.When I call the proc from within the program, only one row gets updatedAny ideas as to why this is happening??JobID Description Price Status----------------------------------------------73412 Documents:Item 3 .00 073412 Documents:Item 5 .00 073412 Documents:Item 2 .00 073412 Documents:Item 4 .00 073412 Documents:Item 1 .00 0^^^^Only one record gets updated, so the table ends up being...JobID Description Price Status----------------------------------------------73412 Documents:Item 3 .00 473412 Documents:Item 5 .00 073412 Documents:Item 2 .00 073412 Documents:Item 4 .00 073412 Documents:Item 1 .00 0Public Sub UpdateAllItems() As BooleanDim objCnn As ADODB.ConnectionDim objCmd As ADODB.CommandSet objCnn = New ADODB.ConnectionWith objCnn.ConnectionString = cnConn.CursorLocation = adUseClient.OpenEnd WithSet objCmd = New ADODB.CommandSet objCmd.ActiveConnection = objCnnWith objCmd.CommandText = "sp_UpdateJobItem".CommandType = adCmdStoredProc.Parameters.Append .CreateParameter("@Status", adInteger,adParamInput, 4, Me.Status).Parameters.Append .CreateParameter("@JobID", adInteger,adParamInput, 4, Me.iJobID).ExecuteEnd WithSet objCnn = NothingSet objCmd = NothingEnd Sub-----------------------------------------------------------------SET QUOTED_IDENTIFIER ONGOSET ANSI_NULLS ONGOALTER PROCEDURE dbo.sp_UpdateJobItem@JobID As int, @Status As intAS--================================================== ===========================================SET XACT_ABORT OFF -- Allow procedure to continue aftererrorDECLARE @error integer -- Local variable to capture theerror OnHoldAction.--================================================== ===========================================BEGIN TRANSACTIONUPDATE tbl_JobItemsSET Status = @statusWHERE JobID = @JobID--================================================== ===========================================-- Check for errors--================================================== ===========================================SELECT @error = @ERRORIf @error > 0BEGINROLLBACK TRANSACTIONENDElseBEGINCOMMIT TRANSACTIONENDGOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGO
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Feb 27, 2008
I'm looking for some performance assistance on updating a column value in a table that contains approximately 50 million rows. I have a permanent table in another database that has the key column and value to be set. My query is listed below, but I'm afraid it will run quite awhile. Any suggestions would be appreciated.
update mytable
set column2 = b.column2
from mytable as a
join mytable1 as b
on a.column1 = b.column1
There is a one to one relationship between the two tables.
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Apr 12, 2007
Hello All
I am trying to figure out if what i am attempting to do is possible and whether or not my approach is wrong to begin with.
I am trying to build a custom report for our accounting system which is Traverse from Open systems. This is what i have done in the stored procedure thus far
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS ON
GO
ALTER PROCEDURE rptArFLSalesByCustItemized_sp
@custId pCustID,
@dateFrom datetime,
@dateThru datetime,
@itemIdFrom pItemId,
@itemIdThru pItemId
as
set nocount on
-- define some variables for previous year
declare @LYqty int, @LyAmt money, @LYfrom datetime, @LYthru datetime
-- set defaults
SET @itemIdFrom=ISNULL(@itemIdFrom,(SELECT MIN(itemId) FROM tblInItem))
SET @itemIdThru=ISNULL(@itemIdThru,(SELECT MAX(itemId) FROM tblInItem))
SET @LYfrom=DATEADD(YEAR,-1,@dateFrom)
SET @LYthru=DATEADD(YEAR, -1, @dateThru)
-- create small temp table to hold customer info
Create Table #tmpArCustInfo
(
custId pCustID,
custName VARCHAR (30),
)
-- populate customer temp table with info
Insert into #tmpArCustInfo
select custId, custName
from tblArCust
WHERE custId = @custId
-- create a temp table to hold the Data for each Item
Create Table #tmpArSalesItemized
(
itemId pItemId,
productLine VARCHAR (12),
pLineDesc VARCHAR (35),
descr VARCHAR (35),
LYQtySold int,
LYTDQtySold int,
QtySold int,
LYTDsales money,
totalSales money,
LastInvDate datetime,
)
-- populate the temp table with all of the inventory items
insert into #tmpArSalesItemized
select ii.itemId, ii.productLine, ip.Descr, ii.Descr, 0,0,0,0,0, NULL
from tblInItem ii, tblInProductLine ip
where ip.productLine = ii.productLine
AND ii.itemId BETWEEN @itemIdFrom AND @itemIdThru
-- update table with this years quantities
update #tmpArSalesItemized
SET QtySold = (select SUM(QtyOrdSell) from tblArHistDetail hd
where TransId IN (select TransId from tblArHistHeader where custId = @custId)
AND orderDate IN (select OrderDate from tblArHistHeader where OrderDate BETWEEN @dateFrom AND @dateThru)
AND hd.partId BETWEEN @itemIdFrom AND @itemIdThru
GROUP BY hd.partId
)
-- Return the temp tables results
select * from #tmpArSalesItemized, #tmpArCustInfo
drop table #tmpArSalesItemized, #tmpArCustInfo
return
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
My problems begin where i want to start updating all of the Qty's of the QtySold field. I have managed to get it to write the same sum in every field but i cannot figure out how to update each row based on the sum of the qty found for that item in the tblArHistDetails table, trouble is too that there is no reference to the custId in that table either. The custId resides in tblArHistHeader and is linked to the details table via the TransId column. So really i need to update many rows based on criteria from 2 other tables.
Can anyone please help? I dont have a clue how to make this work, and most of what i have learned about sql thus far has been from opening other stored procs etc in the accounting system and just reading to see how the developers have done things.
Thanks
Jamie
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Aug 5, 2014
It was an interview question, what's the best way to update a table with 10 billion rows.
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Jan 24, 2008
I have to write a couple scripts that will update a couple columns in two separate tables and also insert a new row with the same data except for a few calculated or provided values ...... see specs below ...
1. tGradeHist Table Script One (Needs to be run first)
a. Read tGradeHist Table and Select rows with GradeEndDate = NULL and GradeStartDate = '1/1/2007 12:00:00 A.M.'
b. Calculate New Step Amount = StepAmount * Incr% (Round To Nearest Whole Dollar)
c. Create New Row for this table using information from row read above and insert new information where indicated :
GradeCode - Same
GradeLocationCode - Same
Step - Same
GradeStartDate - '7/1/2007 12:00:00 A.M.'
GradeEndDate - NULL
GradeCurrencyCode - Same
StepAmount - Result of b (above)
GradeFrequencyCode - Same
RangeMaximumAmount - Same
RangeMidAmount - Same
RangeMinimumAmount - Same
GradeCurrentFlag - 'True'
MarketMaximumAmount - Same
MarketMidAmount - Same
MarketMinimumAmount - Same
GradeGUID - Same
TSCOL - Same
d. Update Row read in a (above) with GradeEndDate = '6/30/2007 12:00:00 A.M.' and GradeCurrentFlag = 'False'
2. tPersonBasePayHist Table Script Two (Needs to be run second)
a. Read tPersonBasePayHist Table and Select rows with PersonBasePayEndDate = NULL
b. Calculate New PersonBasePayAmount = PersonBasePayAmount * Incr% (Round To Nearest Whole Dollar)
c. Create New Row for this table using information from row read above and insert new information where indicated :
PersonGUID - Same
PersonBasePayStartDate - '7/1/2007 12:00:00 A.M.'
PersonBasePayEndDate - NULL
PersonBasePayCurrencyCode - Same
PersonBasePayAmount - Result of b (above)
PersonBasePayFrequency - Same
PersonBasePayPayrollFrequencyCode - Same
BasePayReasonCode - 'SA'
ConductedBasePayReviewDate - Same
ScheduledBasePayReviewDate - Same
PayrollCode - Same
PersonBasePayCurrentFlag - 'True'
ApprovedByPersonGUID - Same
PersonBasePayGUID - Same
TSCol - Same
d. Update Row read in a (above) with PersonBasePayEndDate = '6/30/2007 12:00:00 A.M.' and PersonBasePayCurrentFlag = 'False'
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Dec 2, 2015
This question is extension from the topic Updating table Rows with overlapping dates:Â [URL] .....
I am actually having a table as following:
Table Name: PromotionList
Note that the NULL in endDate means no end date or infinite end date.
ID PromotionID StartDate EndDate Flag
1 1 2015-04-05 2015-05-28 0
2 1 2015-04-23 NULL 0
3 2 2015-03-03 2015-05-04 0
4 1 2015-04-23 2015-05-29 0
5 1 2015-01-01 2015-02-02 0
And I would like to produce the following outcome to the same table (using update statement): As what you all observe, it merge all overlapping dates based on same promotion ID by taking the minimum start date and maximum end date. Only the first row of overlapping date is updated to the desired value and the flag value change to 1. For other overlapping value, it will be set to NULL and the flag becomes 2.
Flag = 1, success merge row. Flag = 2, fail row
ID PromotionID StartDate EndDate Flag
1 1 2015-04-05 NULL 1
2 1 NULL NULL 2
3 2 2015-03-03 2015-05-04 1
4 1 NULL NULL 2
5 1 2015-01-01 2015-02-02 1
The second part that I would like to acheive is based on the first table as well. However, this time I would like to merge the date which results in the minimum start date and End Date of the last overlapping rows. Since the End date of the last overlapping rows of promotion ID 1 is row with ID 4 with End Date 2015-05-29, the table will result as follow after update.
ID PromotionID StartDate EndDate Flag
1 1 2015-04-05 2015-05-29 1
2 1 NULL NULL 2
3 2 2015-03-03 2015-05-04 1
4 1 NULL NULL 2
5 1 2015-01-01 2015-02-02 1
Note that above is just sample Data. Actual data might contain thousands of records and hopefully it can be done in single update statement.
Extending from the above question, now two extra columns has been added to the table, which is ShouldDelete and PromotionCategoryID respectively.
Original table:
ID PromotionID StartDate EndDate Flag ShouldDelete PromotionCategoryID
1 1 2015-04-05 2015-05-28 0 Y 1
2 1 2015-04-23 2015-05-29 0 NULL NULL
3 2 2015-03-03 2015-05-04 0 N NULL
4 1 2015-04-23 NULL 0 Y 1
5 1 2015-01-01 2015-02-02 0 NULL NULL
Should Delete can take Y, N and NULL
PromotionCategoryID can take any integer and NULL
Now it should be partition according with promotionid, shoulddelete and promotioncategoryID (these 3 should be same).
By taking the min date and max date of the same group, the following table should be achieve after the table is updated.
Final outcome:
ID PromotionID StartDate EndDate Flag ShouldDelete PromotionCategoryID
1 1 2015-04-05 NULL 1 Y 1
2 1 2015-04-23 2015-05-29 1 NULL NULL
3 2 2015-03-03 2015-05-04 1 N NULL
4 1 NULL NULL 2 Y 1
5 1 2015-01-01 2015-02-02 1 NULL NULL
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Feb 24, 2006
Hi,
I have an application where I'm filling a dataset with values from a table. This table has no primary key. Then I iterate through each row of the dataset and I compute the value of one of the columns and then update that value in the dataset row. The problem I'm having is that when the database gets updated by the SqlDataAdapter.Update() method, the same value shows up under that column for all rows. I think my Update Command is not correct since I'm not specifying a where clause and hence it is using just the value lastly computed in the dataset to update the entire database. But I do not know how to specify a where clause for an update statement when I'm actually updating every row in the dataset. Basically I do not have an update parameter since all rows are meant to be updated. Any suggestions?
SqlCommand snUpdate = conn.CreateCommand();
snUpdate.CommandType = CommandType.Text;
snUpdate.CommandText = "Update TestTable set shipdate = @shipdate";
snUpdate.Parameters.Add("@shipdate", SqlDbType.Char, 10, "shipdate");
string jdate ="";
for (int i = 0; i < ds.Tables[0].Rows.Count - 1; i++)
{
jdate = ds.Tables[0].Rows[i]["shipdate"].ToString();
ds.Tables[0].Rows[i]["shipdate"] = convertToNormalDate(jdate);
}
da.Update(ds, "Table1");
conn.Close();
-Thanks
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Oct 15, 2009
is there a way to update multiple rows in one update query in tsql? what I wanted to do is for example I got a table containing
code : desc
1 : a
2 : b
3 : c
4 : d
1 : e
3 : f
I wanted to update it to
code : desc
1 : x
2 : b
3 : y
4 : d
1 : x
3 : y
how to do it?
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Sep 21, 2006
I am very new to SQL Server 2005. I have created a package to load data from a flat delimited file to a database table. The initial load has worked. However, in the future, I will have flat files used to update the table. Some of the records will need to be inserted and some will need to update existing rows. I am trying to do this from SSIS. However, I am very lost as to how to do this.
Any suggestions?
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Jun 2, 2004
Hello, everyone:
Does any one know the good T-SQL practice topic web site? It is better to include solutions. Thanks a lot.
ZYT
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Sep 3, 2006
When setting up databases for end users, what's the best practice regarding who's the dbo for each individual database - the user itself or a sysadmin?
Does it really have any importance at all who the owner (as defined by 'dbo') is ?
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May 7, 2007
(Terms)
TermID, Term
1----- Abc
2----- Arcico
3----- Tunic
and
(RelatedTerms)
TermID, RelatedTermID
1 ------ 3
1------ 2
2------ 4
I want to get the following results
1.- a list of all the terms that start with A%
2.- a list of all the related terms … that belong to terms that start with A%
For number 1 - I am doing a select on Terms table with where term like A%.
For number 2 – I am joining both tables and then once again doing a where term like A%.
Would it be more efficient to take the first results and put them in a table variable, and then just do a join with the second table RelatedTerms.TermID = Terms .TermID
The number of records that generally comeback are between 500 to 1000 records that
What would you consider is a better approach ? or maybe there is an even better way ?
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Aug 14, 2007
Wasn't sure where to ask this question.
Was wondering what everyone is doing in regards to server/db protection?
Do you run your DB's on independent servers?
Do you run your DB's on clustered servers?
Do you run your DB's on redundant haardware w/ a 3rd party
application for bit-to-bit data replication?
Is anyone placing the DB's on a SAN's?
We're at a crossroads, and looking for a good direction to ensure the DB's are up.
Any insight welcome.
Thanks,
Kerry
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Dec 11, 2007
hello
i'm a newbie for sql , but i want to learn sql on my own , is there any way that i can learn sql , do i have to download sample database from the internet, do i need to have my own server to play with. Hopefully someone show some lights on this.
regards
sutha
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