Need Help Selecting Primary Key!
Mar 10, 2008
Hello!
I´m having some trouble choosing my primary key for a database I´m currently developing. I´m not that experienced with developing databases, although this is not my first.
I have an OrderLookup table, where the PK is the PurchaseOrderID.
I also have an OrderInput table, where the user input will be stored.
The PurchaseOrderID will exist in this table also, and all records
must have a corresponding PurchaseOrderID in the OrderLookup table.
My issue here is that in the OrderInput table, one PurchaseOrderID
can exist many times, so I´m not really sure how to set up my PK for this table.
I´m thinking maybe I should just create an identity column and use as PK,
and have PurchaseOrderID be a FK referencing OrderLookup.
Would that be a good idea? Since like 98% of all queries will have a "where PurchaseOrderID = xxxx", would it be a good idea to move the clustered index from the PK to the FK?
Other thoughts?
Thanks in advance!
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Apr 11, 2008
I have table A with Primarykey column, AId, Identity field.
I have table B with foriegn key column , AId,
I have same number of rows in both tables (over million), but in Table B, column AId is null at present, as it was added later.
Now I need to select all AId values and update them in existing rows.
Any idea, how would my T-SQL look like???
Many Thanks,
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Sep 20, 2007
I've got a big problem that I'm trying to figure out:
I have an address table out-of-which I am trying to select mailing addresses for companies UNLESS a mailing address doesn't exist; then I want to select the physical addresses for that company. If I get multiple mailing or physical addresses returned I only want the most recently edited out of those.
I don't need this for an individual ID select, I need it applied to every record from the table.
My address table has some columns that look like:
[AddressID] [int]
[LocationID] [int]
[Type] [nvarchar](10)
[Address] [varchar](50)
[City] [varchar](50)
[State] [char](2)
[Zip] [varchar](5)
[AddDate] [datetime]
[EditDate] [datetime]
AddressID is a primary-key non-null column to the address table and the LocationID is a foreign key value from a seperate Companies table.
So there will be multiple addresses to one LocationID, but each address will have it's own AddressID.
How can I do this efficiently with perfomance in mind???
Thank you in advance for any and all replies...
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Jan 11, 2007
Uma writes "Hi Dear,
I have A Table , Which Primary key consists of 6 columns.
total Number of Columns in the table are 16. Now i Want to Convert my Composite Primary key into simple primary key.there are already 2200 records in the table and no referential integrity (foriegn key ) exist.
may i convert Composite Primary key into simple primary key in thr table like this.
Thanks,
Uma"
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Aug 28, 2002
Hi all,
Can anyone suggest me on Adding primary key to a table which has already a primary key.
Thanks,
Jeyam
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Aug 13, 2007
Hi,
I have recently been looking at a database and wondered if anyone can tell me what the advantages are supporting a unique collumn, which can essentially be seen as the primary key, with an identity seed integer primary key.
For example:
id [unique integer auto incremented primary key - not null],
ClientCode [unique index varchar - not null],
name [varchar null],
surname [varchar null]
isn't it just better to use ClientCode as the primary key straight of because when one references the above table, it can be done easier with the ClientCode since you dont have to do a lookup on the ClientCode everytime.
Regards
Mike
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Feb 4, 2015
We have a table, which has one clustered index and one non clustered index(primary key). I want to drop the existing clustered index and make the primary key as clustered. Is there any easy way to do that. Will Drop_Existing support on this matter?
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Feb 21, 2006
A colleague of mine has a view that returns approx 100000 rows in about 60 seconds.
He wants to use the data returned from that view in an OLE DB Source component.
When he selects the view from the drop-down list of available tables then SSIS seems to hang without any data being returned (he waited for about 15 mins).
He then changed the OLE DB Source component to use a SQL statement and the SQL statement was: SELECT * FROM <viewname>
In this instance all the data was returned in approx 60 seconds (as expected).
This makes no sense. One would think that selecting a view from the drop-down and doing a SELECT *... from that view would be exactly the same. Evidently that isn't the case.
Can anyone explain why?
Thanks
-Jamie
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Jan 28, 2004
Hi all
I have the following table
CREATE TABLE [dbo].[property_instance] (
[property_instance_id] [int] IDENTITY (1, 1) NOT NULL ,
[application_id] [int] NOT NULL ,
[owner_id] [nvarchar] (100) NOT NULL ,
[property_id] [int] NOT NULL ,
[owner_type_id] [int] NOT NULL ,
[property_value] [ntext] NOT NULL ,
[date_created] [datetime] NOT NULL ,
[date_modified] [datetime] NULL
)
I have created an 'artificial' primary key, property_instance_id. The 'true' primary key is application_id, owner_id, property_id and owner_type_id
In this specific instance
- property_instance_id will never be a foreign key into another table
- queries will generally use application_id, owner_id, property_id and owner_type_id in the WHERE clause when searching for a particular row
- Once inserted, none of the application_id, owner_id, property_id or owner_type_id columns will ever be modified
I generally like to create artificial primary keys whenever the primary key would otherwise consist of more than 2 columns.
What do people think the advantages and disadvantages of each technique are? Do you recommend I go with the existing model, or should I remove the artificial primary key column and just go with a 4 column primary key for this table?
Thanks Matt
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Jun 10, 2004
Hi,
I am trying to select all entries from a database apart from the top/latest entry, via a stored procedure.
Below is the code that i have but i am doing it wrong somehow.
Any ideas?
Thanks
CREATE PROCEDURE spNEWSARCHIVE AS
SELECT *
FROM tblNEWS
WHERE NewsID NOT TOP 1
ORDER BY NewsID DESC
GO
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Apr 14, 2006
Hi,I have the following set and would like to select all rows that havemin value of column 4 for a given column 1 and 2 group, irrespective ofcolumn 3, as below:C1 C2 C3 C4---------------------A B x 5A B y 10A BB XX 55A BB YY 11AA CC z 1AA CC zz 11Need---A B x 5A BB YY 11AA CC z 1using sql server 2000 (which does not provide rank or partition by)Thanks in advance,Tamas
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Sep 5, 2006
Hello,I have a gridview bound to a sqldatasource control. I have an emptydatatemplate setup. In the selecting event, I make sure that an actual select has been performed (and not on null data); however, I have cancelselectonnullparameters set to true to stop it, because initially it will be null.However, the selecting event runs, even when I cancel it, the emptydatatemplate shows up. How do I prevent that from occuring?
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Jan 7, 2007
Hi Folks,
You can select all fields with:SELECT * FROM [TableName]
How do you select NOTHING or NONE with a SELECT statement?
Thanks
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Feb 19, 2007
Dear All,
I need to select records between two datetimes.
My Database Structure and sample values are as below
Fromdate ToDate
2007-02-20 09:00:00.000 2007-02-20 12:00:00.0002007-02-20 08:00:00.000 2007-02-20 12:00:00.0002007-02-20 06:00:00.000 2007-02-20 13:00:00.000
Query i used
select * from tablename where ((fromdate between Convert(datetime,'2007-19-2 10:00',103) and Convert(datetime,'2007-19-2 11:00',103)) or (todate between Convert(datetime,'2007-19-2 10:00',103) and Convert(datetime,'2007-19-2 11:00',103)))
My query is not returning values when i am querying between '2007-19-2 10:00' and '2007-19-2 11:00'
Please help
Thanks
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Jul 18, 2007
Hi, This is quite an obvious problem, but for some reason I can't think through the solution. I have two columns, a datetime (datecreated) and an id (FK) othertableid (id)what I would like to be able to do is select a list of id and datecreated, but only chose the latest row for each id.So I guess it's a bit like a distinct on the id column, but ensuring the date returned is the top date. Please help
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Sep 4, 2007
Hi i was wanting to know how to select a record in a gridview. I have a gridview with firsname and lastname. I currently have select command on it but don't want it. I want to be able to select first name or last name and have it take me to that record on the database.
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Apr 21, 2008
hello all,
i have a nested gridview. how do i add a SELECTING event for this datasource for my inner gridview? because i need to increase the commandtimeout. thnx.
private SqlDataSource ChildDataSource(string strCustno) { string strQRY = "Select ..."; SqlDataSource dsTemp = new SqlDataSource(); dsTemp.ConnectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString ; dsTemp.SelectCommand = strQRY; return dsTemp; }
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Jun 15, 2008
How can I select data between Mth row and Nth row from a specific search condition? for example , I want to get the 5th to 10th employee who is born in March and ordered by their name.
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Oct 21, 2004
Hello:
I have one table and it contains a column named ID Number, and a column named Date. I have a Do While statement that runs a SQL select statement a few times based on the number of records with the same ID Number. During the Do While statement the information is copied into another table and deleted from the old table. After I look at the results, I see that at the second Do While loop, the data was not selected and the Select statement did not run... so the old variable value from varValue is used again... Any reasons on why?
Here is a code snippet of what is going on:
Do While varCount < varRecordCount
conSqlConnect.Open()
cmdSelect = New SqlCommand ("Select * From temp_records_1 where [id number]=@idnumber and date<@date", conSqlConnect)
cmdSelect.Parameters.Add( "@accountnumber", "10000" )
cmdSelect.Parameters.Add( "@date", dtnow )
dtrdatareader = cmdSelect.ExecuteReader()
While dtrdatareader.Read()
If IsDbNull(dtrdatareader("value")) = false Then
varValue = dtrdatareader("value")
End If
End While
dtrdatareader.Close()
conSqlConnect.Close()
'#####The information above is copied to another table here
'#####The record where the information was received is deleted.
varCount = varCount + 1
LoopAny ideas?
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Jun 2, 2005
I have a tbale with maybe 30 columns and I'm selecting all where a
record number matches a parameter I've passed. That works fine,
however is there any way to do some conversions to fields when
selecting without having to list out each column? For instance
this is what it looks like now:
SELECT *
FROM Losses
WHERE @AppRecord = AppRecord
ORDER BY Record ASC
But I want to convert say one column, is there a way to keep similar syntax instead of listing out each column?
SELECT *, CONVERT(varchar(15), [Losses]) as [Losses]
FROM Losses
WHERE @AppRecord = AppRecord
ORDER BY Record ASC
And the column I'm converting is of type 'money'. I'm converting
it to get rid of the extra zeroes at the end. If you know a
better way to do it I'd be interested in knowing.
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Sep 6, 2005
CREATE PROCEDURE {databaseOwner}{objectQualifier} [PreciseData_IssueTracker_GetAllIssues]@moduleId intASSELECT PreciseData_IssueTracker_Issue.id AS 'issueId',PreciseData_IssueTracker_Status.name AS 'statusName',PreciseData_IssueTracker_Issue.subject AS 'subject',PreciseData_IssueTracker_Type.name AS 'typeName',Users.Username AS 'assignedUserName',Users.Username AS 'raiserUserName',PreciseData_IssueTracker_Issue.raiseDate AS 'raiseDate'FROMPreciseData_IssueTracker_Issue INNER JOIN PreciseData_IssueTracker_Status ON PreciseData_IssueTracker_Issue.statusId=PreciseData_IssueTracker_Status.idINNER JOIN PreciseData_IssueTracker_Type ON PreciseData_IssueTracker_Issue.typeId=PreciseData_IssueTracker_Type.idINNER JOIN Users ON Users.UserID=PreciseData_IssueTracker_Issue.assignedUserIdINNER JOIN Users ON Users.UserID=PreciseData_IssueTracker_Issue.raiserUserIdWHERE PreciseData_IssueTracker_Issue.moduleId=@moduleIdORDER BY PreciseData_IssueTracker_Issue.raiseDate DESCGOHow do i make it work?
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Sep 20, 2005
Hi
I have a content management system that I am building. My CMS has a
pages table which contains 60 fields, some are varchars, some are ntext
some are dates etc. They have field names which match their purpose
like varchar1, ntext3 etc. These fields are used up depending on which
template is applied to the page.
The templatefields table holds holds the information about each field
in a template. It's control type (rich text control, date control etc)
and the field in the pages table that the data will be stored in
(varchar1,ntext3 etc)
What I want to be able to do is loop through the templatefeilds table
for a particular template and then using the field name for the pages
table, go to the pages table and get the value to populate the control.
So to clarify, I would like to produce a stored procedure which outputs
the page field name (varchar1) from the templatefields table and
varchar1's value in the pages table. Maybe in a temporary table.
Is this possible?
Any guidance would be appreciated..
Thanks in advance
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Mar 23, 2006
Hi --
What is the proper way to select results with a date in the where statement when the datatype of the column is datetime?
select * from table where date_field = '3-23-2006' does not get any results.
Thank-you for your help.
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Jan 7, 2002
how can I select 10 random rows from a table?
Please help
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May 8, 2001
We are developing an Access application that will be used to run adhoc reports against a SQL Server table. Selection criteria is entered on a form, a passthru query is built on the fly, and the results are formatted for output via an Access report.
There are 16 different fields on the query form. Two are date fields (from / to), the rest are text. The user is required to supply a date range for the report. They may specify any combination of the remaining query fields.
Examples:
From/To dates, part number, work order number
From/To dates, location, operation, sales order number, operator
What is the best scheme to use for the indexes? One index for each potential query field? Or, a single index that includes ALL query fields? Or, some other combination?
I should also mention that there will be no realtime updates to the table. On a weekly basis, we will import updates from a mainframe extract (dropping the indexes prior to the import, rebuilding them afterwards).
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Jan 25, 2002
I have a database which has a field called fldTimes. basically this field records the number of hits a file gets. How can I choose the most 5 popular files with the greatest hits. Thanks
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Oct 10, 2000
Can anyone help me in finding out the database name?
For example, @@SERVERNAME gives you the name of the server
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In the same way, is there any global variable which gives me the
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Thanks
Sushruth Nanduri.
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Nov 16, 2001
I have a query that returns a certain amount of results. How do I select the last row??? I know I can do the top row by doing (top 1). Basically I need the complete opposite. Please help...
I looked around and couldn't find anything on it.
thanks in advance
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Aug 21, 2001
Hello .
Sometimes when i try to select data from a table (from a selected database)
using SQL Query Analyzer (for exemple) i receive an error message : "The Object XX does not exist" . But when i prefix it by the Owner it work .
What is the problem then ?
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Sep 12, 2001
Hello,
Does anyone know how to select rows by their position in a table. I need to be able to e.g return the 2,000th - 2,200th rows as a set. I will have many concurrent clients connecting to this table so I do not want to use cursors. The table is 800,000 in length.
Any ideas people?
Thanks,
Alan
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Oct 30, 2001
I wanted to schedule a DTS package to run on the last day of the month at 11:30 PM. I noticed that when you use EM to do this I scheduled it to run monthly on the 31st. Hate to ask a dumb question, it will run tomorrow on 10/31, what happens in November on the 30th, is SQL smart enough to do it on that date?
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Sep 13, 2005
This is, I'm hoping, a simple thing that I just don't know how to do. But I've searched my books and read a lot of threads but so far, no luck in what I'm trying to do. Here's the basic layout of 2 tables from my d/b (MSDE):
tblCity
cityID (p/k)
stateID (f/k to tblState.stateID)
cityName (varchar 35)
tblStudent
studID (p/k)
cityID (f/k to tblCity.cityID)
hometownID (f/k to tblCity.cityID)
studFName (varchar 25)
studLName (varchar 35)
...
I *hope* that what I tried to do there is allowed. Basically what I'm trying to do is to tie the student to both his current City (by foreign key cityID) and his hometown city (also by foreign key cityID).
So, if New York is (127, 33, 'New York') and Birmingham is (1050, 1, 'Birmingham') (in tblCity), then in the student table (tblStudent), John Smith would be
Quote: 12150, 127, 1050, 'John', 'Smith', ...
How would I format my SQL statement to get both cityNames? I thought this would work
Code:
SELECT s.studID, c.cityID, c.hometownID,
s.studLName + ', ' + s.studFName AS studNameName,
c.cityName, c.cityName AS swapconNum
FROM tblStudent AS s INNER JOIN tblCity AS c
ON (s.cityID = c.cityID)
WHERE s.studID = 12150
Can I do this? If so, what am I doing wrong? Sorry, I'm kinda sorta new to SQL.
RudeDog
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Aug 19, 2005
Hello,
I think I have a pretty simple question,
I have a list of record IDs that I need to search on. I'm trying to create a query like this:
Select record_ID
FROM table
WHERE record_id <> (1,3,4,6,8,9,11)
In a table with 12 records, I'd like it to return 2,5,6,10,12
Background:
I have a list of .jpgs that correspond to record_ids. I want to take the list of .jpg names and compare that to the record_ids so I may delete any .jpgs that do to not have a corresponding record.
Any help would be appreicated.
-Matt
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