T-SQL (SS2K8) :: Selecting The Top Record With Certain Conditions?
May 14, 2014
The situation is that we have resources (trucks) that perform shifts. Shifts consists of actions. A resource can perform multiple shifts.
For every resource we want to find the record that:
- Is 'younger' than the last realized action.
- Has actionkind pickup, deliver or clean
I have constructed a solution with CTE and row_number but I was curious if there would be other alternatives. The fact that I'm joining a CTE onto itself and subject the outcome to a partition makes me think there are sharper ways.
Note that the action id in the data below is also sorted but in practice this need not be the case. The sorting key is prevalent.
output of the query is
id_action id_resource actionKindCode
4665 4 clean
34540 96 pickup
24000 901 clean
declare @mytable table (
id_action int,
id_shift int,
[code]....
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Apr 15, 2014
I am facing a problem in writing the stored procedure for multiple search criteria.
I am trying to write the query in the Procedure as follows
Select * from Car
where Price=@Price1 or Price=@price2 or Price=@price=3
and
where Manufacture=@Manufacture1 or Manufacture=@Manufacture2 or Manufacture=@Manufacture3
and
where Model=@Model1 or Model=@Model2 or Model=@Model3
and
where City=@City1 or City=@City2 or City=@City3
I am Not sure of the query but am trying to get the list of cars that are to be filtered based on the user input.
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Aug 27, 2014
I have created the following SQL snippet that is a very simple mock-up illustrating the problem (I hope!) that I am facing:
-- create table
if object_id('tempdb..#tmpdelnotes') is not null
drop table #tmpdelnotes
create table #tmpdelnotes(
DelNote int identity (1,1) ,
DelDate date not null,
Item int not null,
Customer int not null)
[code]...
What I need to retrieve is a unique list of item numbers with information about the latest (DelDate) delivery note. The "Clumsy workaround" works, but is not very pretty when doing multiple table joins. Is it really necessary to use a derived table for this kind of query? Window functions can only exist in the SELECT and ORDER BY clauses, which is understandable since the calculations take place (I would guess) after the aggregations in the HAVING clause.
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Oct 25, 2007
Hi! I have a table Tbl1 has to columns:
A B
_________
Ibm Me
Sony Me
Me Bob
Me Frank
I'd like to select all rows where B=ME and A=Me Thanks for the help
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Aug 18, 2004
We have three fields in a table: firstname, Surname & Organisation. Firstname & surname will always be filled but in most cases organisation is NULL.
Part of what these fields will be used for is a mailshot. If there is no organisation data then the mailshot will open with 'Dear Firstname Surname, ' but if the organisation is present they would like 'Dear Organisation'.
Is it possible to create a select state that checks the organisation field, and if a value is present return that value else return the firstname, surname combination? I have tried various things but I cannot get it to work.
I know the ideal situation would be to do this type of condition check at scripting level (PHP, ASP, Visual Basic) but my bosses would like to try it at SQL level.
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Dec 6, 2012
ID (PK), userID (FK), from [Datetime], to[datetime], type [int] , value [nvarchar]
Conditions
I want to select the column "to" which is a datetime-column for all users within the table.
One user can have multiple registered rows in "mytable", so I want to select the row that contains the newest "from" date.The newest "from"-column for a specific user is where I am struggling... Because if the "to"-column of any of the registered rows by the current user is equal to the newest "from -1 day" column for the user, I want to select the second newest from-date.
Code:
//Handwritten
DECLARE @from DATETIME //Current Selected datetime [the newest of the current user doing the query]
DECLARE @id INT //userID
DECLARE @tbl TABLE (from datetime, userid int)
[code]....
But for user ID 201 [all users with Type = 1], I need to run through some more code, to figure out which date we want... Which date do I want? The "from"-date that is the newest, but if "to" is just 1 day before "from", I want to select the "from" at that row instead... Example with numbers [integers] instead of Date:
Code:
From - To
5 8
10 15
16 20
I want to select "10" in the from column as the maximum "from"-integer, and not 16. Because in the "To" column we have a match in the "from" column on the condition "To + 1" [15+ 1 == 16], so then I want the "from" value where "To" equals 15, which is 10. The top row I do not want, because the difference between From and To [10 - 8 is larger than 1]...
This means that the Image shown... I am first selecting the "1", then I do some checks, if the "to" for the user is 1 day earlier than the MAX(from) I grab a new "from" value...
Code:
SELECT MIN (t1.from) FROM table as t1
WHERE
t1.from IN
(
SELECT t2.to+ 1 FROM table as t2
WHERE t2.userID = @id
)
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Aug 27, 2015
I have a table where when an employee works LEAVE1 and LEAVE2 paycodes on the same day then in the new column called 'FLAG' we need to put a 1 for LEAVE1 and a 2 for LEAVE2, when these paycodes are not there on the same day then flag will be NULL as for other paycodes.
Tried using the CASE statements but it always puts a 1 or 2 for the respective paycodes regardless of the fact whether they were together on the same day or not.
WITH SampleData (PERSON,TRANSACTDATE, STARTDATE, END_DATE, IN_PUNCH,OUT_PUNCH,HOURS, PAYCODE) AS
(
SELECT 1234,'08/03/2015','08/03/2015','08/03/2015', '06:00','09:00','3', 'REG1' UNION ALL
SELECT 1234,'08/03/2015','08/03/2015','08/03/2015', '09:00','13:00','4','REG2' UNION ALL
SELECT 1234,'08/04/2015','08/04/2015','08/04/2015', '09:00','13:00','4','LEAVE1' UNION ALL
SELECT 1234,'08/04/2015','08/04/2015','08/04/2015', '14:00','16:00','2', 'LEAVE2'UNION ALL
SELECT 1234,'08/05/2015','08/05/2015','08/05/2015', '08:00','09:00','1', 'LEAVE1'UNION ALL
SELECT 4553,'08/05/2015','08/05/2015','08/05/2015', '08:00','09:00','1', 'REG1'UNION ALL
SELECT 4553,'08/05/2015','08/05/2015','08/05/2015', '10:00','12:00','2','LEAVE2'
)
[code].....
Current Results
PersonTransactDate STARTDATEEND_DATEIN_PUNCH OUT_PUNCH HOURS PAYCODE
123408/03/2015 08/03/201508/03/201506:00 13:00 3 REG1
123408/03/2015 08/03/201508/03/201506:00 13:00 4 REG2
123408/04/2015 08/04/201508/04/201509:00 16:00 4 LEAVE1
123408/04/2015 08/04/201508/04/201509:00 16:00 2 LEAVE2
123408/05/2015 08/05/201508/05/201508:00 09:00 1 LEAVE1
455308/05/2015 08/05/201508/05/201508:00 12:00 2 LEAVE2
455308/05/2015 08/05/201508/05/201508:00 12:00 1 REG1
Desired Results
PersonTransactDate STARTDATEEND_DATEIN_PUNCH OUT_PUNCH HOURS PAYCODE FLAG
123408/03/2015 08/03/201508/03/201506:00 13:00 3 REG1 NULL
123408/03/2015 08/03/201508/03/201506:00 13:00 4 REG2 NULL
123408/04/2015 08/04/201508/04/201509:00 16:00 4 LEAVE1 1
123408/04/2015 08/04/201508/04/201509:00 16:00 2 LEAVE2 2
123408/05/2015 08/05/201508/05/201508:00 09:00 1 LEAVE1 NULL
455308/05/2015 08/05/201508/05/201508:00 12:00 2 LEAVE2 NULL
455308/05/2015 08/05/201508/05/201508:00 12:00 1 REG1 NULL
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May 18, 2006
I have a table that has records layed out as so:Table:fd_Id INT IDENTITY (1, 1)fd_User VARCHAR(30)fd_Effective DATETIMEData could be as follows:1 | "user1" | 6/20/20012 | "user2" | 6/1/20023 | "user2" | 6/5/20024 | "user2" | 6/5/20025 | "user2" | 2/1/20026 | "user3" | 9/1/20037 | "user3" | 10/2/20028 | "user4" | 1/1/2005What I need to retrieve from that table is the SINGLE LATEST item ofeach fd_User.Results:1 | "user1" | 6/20/20013 | "user2" | 6/5/2002 (or 4 | "user2" | 6/5/2002) since the dates arethe same but only 1 of them6 | "user3" | 9/1/20038 | "user4" | 1/1/2005
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Feb 6, 2015
I have the got below T SQL query to fetch the matching record
DECLARE @MappingTable TABLE
(
Productname nvarchar(10),
identification_key1 int,
identification_key2 int,
identification_key3 int
[Code] .....
-- result - 'Orange'
This is an exact matching record and straight forward
Is it possible to identify the record using T SQL query based on the following scenarios
1) return the record - If all the three where conditions match
2) if record not found check and return the record where 2 columns values in the where condition match
-- Expected Result for below query: 'Orange', because 2 of the columns in where condition have matching values
SELECT Productname
FROM @MappingTable where identification_key1=1 or identification_key2 =2 or identification_key3 =1
-- result - 'Orange'
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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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Mar 28, 2014
I have data like the following:
ID COUNTER DATA
1 10 BLAH
1 20 BLAH
2 10 BLAH
3 10 BLAH
2 20 BLAH
2 30 BLAH
What I want to return is:
1 20 BLAH
2 30 BLAH
3 10 BLAH
I want the top 1, having the highest counter from each ID. This is a highly simplified version of that I am pulling which also is between a date range, but same principle.
IE: SELECT * FROM Table WHERE ID in (SELECT DISTINCT ID FROM Table WHERE Date BETWEEN <date> AND <date>
I'd rather keep it in one statement if possible, but if I have to do it in multiple passes then so be it.
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Jun 11, 2014
I'm trying to run this code, which worked on SQL 2000, on 2K8:
SELECT [Business Unit]
,[Department]
,[Ext :]
,[F9]
,[First Name :]
,[Last Name :]
,[Mobex :]
,[Mobile :]
,[Sub Department]
FROM MyCompanyStaffPhoneList...Sheet1$
However it just returns this message..Msg 7308, Level 16, State 1, Line 1 OLE DB provider 'Microsoft.Jet.OLEDB.4.0' cannot be used for distributed queries because the provider is configured to run in single-threaded apartment mode.
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Nov 2, 2015
I have a table of data with lines of various lengths. An example is
A Smith - Give #12345# Sydney City
B Jones and S Jones - Give #876543# Washington
I am trying to work out how to create a new column with just the number between the # symbols. The number would be between 5 and 9 numbers.
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Jun 25, 2004
I'm trying to add a next and previous button to a popup window I have on a photo gallery -
Having trouble with the sql
I know I would have 2 select statements that would each return 1 result set.
I know how to get the top ( and bottom by ordering descending and doing Select Top 1)
But how would I get the next one up!
I would hate returning the entire image section and perform the calcuation in the business tier :(
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Mar 1, 2012
I have one table like this:
Code:
CREATE TABLE DlIndexTable
(SessionStartTime DATETIME NOT NULL PRIMARY KEY, SchemaID INTEGER NOT NULL,
DLBaseRate REAL NOT NULL)
and one like so:
Code:
CREATE TABLE DlTextDataTable (
SessionStartTime DATETIME NOT NULL REFERENCES DlIndexTable,
ChTimestamp FLOAT NOT NULL, Channel01data VARCHAR (255),
Channel02data VARCHAR (255), ... , Channel16data VARCHAR (255),
CONSTRAINT TxtDatPriKey PRIMARY KEY (SessionStartTime, ChTimestamp))
I want to get some combined data from both tables, so right now I am joining them at the SessionStartTime column, which is a primary key in the first and a foreign key in the second table, something like this:
Code:
SELECT DlIndexTable.SessionStartTime, DlTextDataTable.Channel01data
FROM DlIndexTable
LEFT JOIN DlTextDataTable
ON DlIndexTable.SessionStartTime = DlTextDataTable.SessionStartTime
WHERE DlIndexTable.SessionStartTime BETWEEN '2006-10-13 16:40:08.790' AND '2012-03-01 17:54:30.930'
ORDER BY DlIndexTable.SessionStartTime, DlTextDataTable.ChTimestamp
The trouble is that this query, exactly as requested, gives me all the entries from the second table matching the first, while I really would like to pick just one row (preferably, the first chronologically - by ChTimestamp) so that the first column (SessionStartTime) has distinct entries in the resulting table. What would be the simplest way of doing that? Performance is not a big priority over simplicity since the first table could have only a few hundred rows (maybe a couple of thousand), while the second will be real tiny.
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Mar 18, 2015
I’m writing a document management system. The documents themselves are created from the contents of a database. The database is SQL Server.
The database contains a table, like so:
ClientID, ProjectID, DocumentID, MinorVersion, MajorVersion, Name
Initially, the user will create a “V0.1” document. So the data would look something like
ClientID = 1
ProjectID = 1
DocumentID = 1
MajorVersion = 0
MinorVersion = 1
Name = “My Document”
Thereafter, the user can create new versions as “0.2”, “0.3”, etc., or “1.0”, “1.1”, “2.0”, etc.
For example, a “2.1” document would be stored as:
ClientID = 1
ProjectID = 1
DocumentID = 1
MajorVersion = 2
MinorVersion = 1
Name = “My Document”
The earlier versions will still exist on the database, but the latest version will be 2.1.
There may be several different documents, with different DocumentID’s (e.g. DocumentID = “1”, DocumentID = “2”), etc., and each of these documents may have many versions.
I’m trying to write a query to display a list of documents showing ClientID, ProjectID, DocumentID, MinorVersion, MajorVersion, Name… but the list should only display the latest version of each document.
So, if the database contained the following records:
ClientID, ProjectID, DocumentID, MajorVersion, MinorVersion, Name
1,1,1,0,1,My Document
1,1,1,0,2,My Document
1,1,1,0,3,My Document
1,1,1,1,0,My Document
1,1,1,2,0,My Document
1,1,1,2,1,My Document
1,1,2,0,1,My Second Document
1,1,2,0,2,My Second Document
1,1,2,0,3,My Second Document
My query should return:
ClientID, ProjectID, DocumentID, MajorVersion, MinorVersion, Name
1,1,1,2,1,My Document
1,1,2,0,3,My Document
… where 2.1 is the latest version of Document 1 and 0.3 is the latest version of Document 2.how to do it.
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Jul 20, 2005
MSSQL2000I have a table that contains customer transactionsCustomerIDTransactionTransactionDate....I need to select the most recent record that matches a specific CustomerID.I am fairly new to SQL, could someone provide a sample select statement.TIATim Morrison-- Tim Morrison--------------------------------------------------------------------------------Vehicle Web Studio - The easiest way to create and maintain your vehicle related website.http://www.vehiclewebstudio.com
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Jul 20, 2005
I have a stored procedure (below), that is supposeto get a Reg Number from a table, (Reg_Number), insuch a way that every time the stored procedure is called,it will get a different reg number, even if the storedprocedure is called simultaneously from two differentplaces,However it is not working that way.If two different users access a function in thereVB program at the same time, the two different userswill get the same reg number.I have looked at the stored procedure, it looks foolproof,yet it is not working that way.Thanks in Advance,Laurence NuttallProgrammer Analyst IIIUCLA - Division of Continuing Education'---------------------------------------------------------------------------Here it is:CREATE PROCEDURE sp_GetNextRegNum@newRegNum char(6) = NULL OUTPUTASLABEL_GET_ANOTHER_REG:Select @newRegNum =(select min(Reg) from reg_number)IF Exists (select Reg from reg_number where reg = @newRegNum )BeginDelete from reg_number where reg = @newRegNumIF @@Error <> 0BeginGoto LABEL_GET_ANOTHER_REGEnd--EndifEndELSEGoTo LABEL_GET_ANOTHER_REG--EndifGO
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Mar 26, 2008
This is my first post so I hope I'm doing it to the right forum. I need to compare a LastUpdated time to Start and End Time fields to get the "Due" Time for a given order. Can someone give me the correct SQL? (the example below should result in 6:00:00 AM "Due" time.) All are DATETIME fields. Thank you.
LastUpdated StartTime EndTime DueTime
5/29/2007 12:04:32 AM 2:00:00 AM 11:30:00 AM 3:30:00 PM
11:30:00 AM 5:00:00 PM 9:00:00 PM 5:00:00 PM 2:00:00 AM 6:00:00 AM
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Jun 4, 2014
I have 3 tables:
News:
bigint NewId
nvarchar NewTitle
datetime NewDate
nvarchar NewBrief
--------------------------
Category:
int CatId
nvarchar CatName
--------------------------
NewsRelCategory:
bigint Id
int CategoryIdFk
bigint NewsIdFk
--------------------------
I want to select NewId, NewDate and Distinct NewTitle
I tried this but NewTitle doesn't distinct:
SELECT
FROM dbo.Category INNER JOIN
NewsRelCategory ON dbo.Category.CatId = NewsRelCategory.NrcCategoryIdFk INNER JOIN
dbo.News ON NewsRelCategory.NrcNewsIdFk = dbo.News.NewId
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Apr 24, 2001
Hello.
I need to select a random record from TABLE. It might look easy with using RAND() function, but the tricky part is that ID's which are the PRIMARY KEY, were assigned as a random number.
So right now ID's in that TABLE look some thing like that: -18745, 45809, 129, -5890023, 487910943, -209, etc...
If any one have any ideas please respond.
Thanks in advance.
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May 19, 2004
Hi all,
I Have the following situation:
CREATE TABLE First_Table (id INTEGER IDENTITY(1,1) NOT NULL,
titre VARCHAR(50) NOT NULL,
annee INTEGER NOT NULL,
idMES INTEGER,
genre VARCHAR(20) NOT NULL,
resume TEXT,
codePays VARCHAR(4),
CONSTRAINT PKFilm PRIMARY KEY (idFilm),
FOREIGN KEY (idMES) REFERENCES Artiste,
FOREIGN KEY (codePays) REFERENCES Pays);
I'ld like fill in this tables records inserting in the column id values I got in the one other table. In Oracle it is possible to do it using sourceTable.nextval where sourceTable is created as: CREATE SEQUENCE sourceTable;
How can I do it in MS SQL or Transact-sql?
Thanx all
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May 25, 2005
I'm no SQL whizz yet but I'm learning hard, and need to get some information from our DB rather urgently so have resorted to this fantastic forum, only I can't find what I'm looking for.
Basically I'm selecting a whole load of entries that have a (admission)date field after 2001, but I only want to return the Earliest (admission) for each (patients number).
Here is the script I have created to select all the data, but how can I limit the results to just the earliest (admission date) for each (patient).
SELECT
Admission_Year, Admission_Month, Age_On_Admission, [Length of stay(continuing)], [Patient's Number], [Cons epis seq no], Sex, [Main Primary Pas Diag], [Date of Death], [Epi duration], [OP Code1], [Admission date], [Date of Death] - [Admission date] AS [days before death],[Intended Management]
FROM dbo.Admissions
WHERE (Admission_Year > 2001) AND (Age_On_Admission > '64') AND ([Intended Management] = 'inpatient') AND ([Date of Death] IS NULL)
I would really appreciate it if anyone can help with this, I'm sorry I can't really contribute to this forum as an SQL expert as .net is really my forte and I usually spend my time contributing to the asp.net forums. :)
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May 21, 2001
Hi
I'm sure this is an easy problem but my brain is fried today...however how do I do the following:
I have a two column table. One is a key field where duplicates can arise and the other is a datetime field. So you might have some records looking like this:
1231999-06-14 12:17:11.000
1231999-06-14 12:17:31.310
1231999-06-14 12:17:31.000
1231999-06-14 12:22:56.000
1231999-06-14 12:22:58.000
8901999-06-15 10:00:18.000
8901999-06-15 10:03:30.340
8901999-06-15 10:03:30.000
8901999-06-15 10:03:40.000
OK, how do I get the top 1 of each key so that I get a subset of records looking like the following:
1231999-06-14 12:17:11.000
8901999-06-15 10:00:18.000
Thanks in advance
Bazza
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Oct 10, 2006
I have the following query I am using to identify duplicate records in one of my database tables:
Code:
SELECT memberID,
COUNT(memberID) AS NumOccurrences
FROM ChapterMembers
GROUP BY memberID
HAVING ( COUNT(memberID) > 1 )
Executing the above proc returns 4079 records...
Now, I would also like to know the ChapterID for each member with a duplicate record. ChapterID is also stored in the ChapterMembers Table...
I tried running the following procedure:
Code:
SELECT memberID,
COUNT(memberID) AS NumOccurrences, chapterID
FROM ChapterMembers
GROUP BY memberID, chapterID
HAVING ( COUNT(memberID) > 1 )
But zero results are returned ...
The ultimate goal here is to identify duplicate records where one of their chapterID's = '81017' and to delete that record from the database.
Anyone have any ideas what I am doing wrong? Also, any suggestions for removing the records would be appreciated.
Thanks,
Jandrews
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Apr 20, 2007
Hi,
Is it possible to select a record by just the date part of the data type TIMESTAMP?
date_time
2007-04-20 16:27:01
For example, a query to select all records added today.
Thanks very much,
dai.hop
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Oct 10, 2005
Hello everyone, I have a query problem.I'll put it like this. There is a 'publishers' table, and there is a'titles' table. Publishers publish titles (of course). Now I want to make aquery (in MS SQL Server) that would return the last title published by everyof the publishers. Quite clear situation. But I can't make it work.If I use inner join (which I should, because I need data from both tables)then I get a result showing all publishers and all titles. What I want toget is all publishers, and only their last title, so I don't have more thanone line for the same publisher, and this line should contain publisherdetails and last title details.I tried using DISTINCT, but it works on a whole resultant row rather then acolumn, and since rows are all distnict (because they also contain columnsfrom titles) this didn't help me.What I can do is (in my application) first get a list of publishers, andthen loop through them selecting only the last title belonging to eachpublisher. I want to see if there is a way to accomplish the same thing withan SQL query (or maybe a stored procedure, view, or whatever). Anything ispossible, as long as it stays within SQL server and doesn't rely on theclient application.Of course, both 'publishers' and 'titles' tables have a primary key('publisherID', and 'titleID'), and 'titles' has a 'publisherID' columnwhich relates titles with publishers.Help :)
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Mar 23, 2006
Good Morning,I have a person table with personID. I have a personRate table withpersonID, rateID, and effectiveDate.I need to select fields from personRate, but I want the fields from theproper record.I need the one child record that has the most current date of the largestrateID.For example a person may have many rate records. I need the record that hasthe most current date of the largest rateID they have. Does that makesense?I am making a view that has data from both tables. I need to display themost current rate info.Any ideas? TIA ~ CK
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Jan 31, 2014
I have inherited a query which currently returns multiple instances of each work order because of the joined tables. The code is here and I've detailed the criteria needed below but need the best way to accomplish this:
Select h.worknumber, h.itemcode, h.descr, h.task_descr, h.qty, h.itemised,
h.serialnum, h.manufacturer, h.model_id, h.depot, h.date_in, h.date_approved,
h.est_complete_date, h.actual_complete_date, h.meterstart, h.meterstop,
h.custnum, h.name cust_name, h.addr1, h.addr2, h.town, h.county, h.postcode,
h.country_id, h.contact, h.sitename, h.siteaddr1, h.siteaddr2, h.sitetown,
[Code] ....
Each work order should only be returned once, and with the following additional criteria:
1. i.meter - this should return only the lowest number from that file.
2. sm.next_calendar_date - this should return only the most recent date out of those selected for the certificates on this piece of equipment
3. wh.meterstop as [Last Service Hours],
wh.date_created as [Last Service] - this should return the number from wh.meterstop at the most recent wh.date_created for that piece of equipment.
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Oct 29, 2006
Hi,I have a stored procedure that has to extract the child records forparticular parent records.The issue is that in some cases I do not want to extract all the childrecords only a certain number of them.Firstly I identify all the parent records that have the requird numberof child records and insert them into the result table.insert into t_AuditQualifiedNumberExtractDetails(BatchNumber,EntryRecordID,LN,AdditionalQualCritPassed)(select t1.BatchNumber,t1.EntryRecordID,t1.LN,t1.AdditionalQualCritPassedfrom(select BatchNumber,RecordType,EntryRecordID,LN,AdditionalQualCritPassedfrom t_AuditQualifiedNumberExtractDetails_Temp) as t1inner join(select BatchNumber,RecordType,EntryRecordID,Count(*) as AssignedNumbers,max(TotalNumbers) as TotalNumbersfrom t_AuditQualifiedNumberExtractDetails_Tempgroup by BatchNumber, RecordType, EntryRecordIDhaving count(*) = max(TotalNumbers)) as t2on t1.BatchNumber = t2.BatchNumberand t1.RecordType = t2.RecordTypeand t1.EntryRecordID = t2.EntryRecordID)then insert the remaining records into a temp table where the number ofrecords required does not equal the total number of child records, andthenloop through each record manipulating the ROWNUMBER to only selectthe number of child records needed.insert into @t_QualificationMismatchedAllocs([BatchNumber],[RecordType],[EntryRecordID],[AssignedNumbers],[TotalNumbers])(select BatchNumber,RecordType,EntryRecordID,Count(*) as AssignedNumbers,max(TotalNumbers) as TotalNumbersfrom t_AuditQualifiedNumberExtractDetails_Tempgroup by BatchNumber, RecordType, EntryRecordIDhaving count(*) <max(TotalNumbers))SELECT @QualificationMismatched_RowCnt = 1SELECT @MaxQualificationMismatched = (select count(*) from@t_QualificationMismatchedAllocs)while @QualificationMismatched_RowCnt <= @MaxQualificationMismatchedbegin--## Get Prize Draw to extract numbers forselect @RecordType = RecordType,@EntryRecordID = EntryRecordID,@AssignedNumbers = AssignedNumbers,@TotalNumbers = TotalNumbersfrom @t_QualificationMismatchedAllocswhere QualMismatchedAllocsRowNum = @QualificationMismatched_RowCntSET ROWCOUNT @TotalNumbersinsert into t_AuditQualifiedNumberExtractDetails(BatchNumber,EntryRecordID,LN,AdditionalQualCritPassed)(select BatchNumber,EntryRecordID,LN,AdditionalQualCritPassedfrom t_AuditQualifiedNumberExtractDetails_Tempwhere RecordType = @RecordTypeand EntryRecordID = @EntryRecordID)SET @QualificationMismatched_RowCnt =QualificationMismatched_RowCnt + 1SET ROWCOUNT 0endIs there a better methodology for doing this .....Is the use of a table variable here incorrect ?Should I be using a temporary table or indexed table if there are alarge number of parent records where the child records required doesnot match the total number of child records ?
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Jan 30, 2008
This is a simple one, and I know that it has to be fairly common, but I just can't figure out an elegant way to do it. I have a table with the following fields:
OrderID (FK, not unique)
InstallationDate (Datetime)
CreateDtTm (Datetime)
There is no PK or Unique ID on this table, though an combo of OrderID and CreateDtTm would ostensibly be a unique identifier.
For each OrderID, I need to pull the InstallationDate that was created most recently (based on CreateDtTm). Here's what I've got so far, and it works, but man is it ugly:
SELECT a.OrderID, InstallationDate
FROM ScheduleDateLog a
INNER JOIN
(SELECT OrderID, max(convert(varchar(10),CreateDtTm,102)+'||' +convert(varchar(10), InstallationDate,102)) as TopRecord
FROM ScheduleDateLog GROUP BY OrderID) as b
ON convert(varchar(10),CreateDtTm,102)+'||' +convert(varchar(10), InstallationDate,102)=b.TopRecord
AND a.OrderID = b.OrderID
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Jan 10, 2008
My question is fairly simple. When I join between two tables, I always use the ON syntax. For example:
SELECT
*
FROM
Users
JOIN UserRoles
ON (Users.UserRoleId = UserRoles.UserRoleId)
No problems there. However, if I then decide to further filter the selection based on some trait of the UserRole, I have two options: I can add the condition as a WHERE statement, or I can add the condition within the ON block.
--Version 1:
SELECT
*
FROM
Users
JOIN UserRoles
ON (Users.UserRoleId = UserRoles.UserRoleId)
WHERE
UserRoles.Active = 'TRUE'
-- Version 2
SELECT
*
FROM
Users
JOIN UserRoles
ON (Users.UserRoleId = UserRoles.UserRoleId
AND UserRoles.Active = 'TRUE')
So, the question is, which is faster/better, if either? The Query Analyzer shows the two queries have the exact same execution plan, which makes sense, since they're both joining the same tables. However, I'm wondering if adding the condition in the ON statement results in fewer rows the JOIN statement initially needs to join up, thus reducing the overall initial size of the results table before the WHERE conditions are applied.
So is there a difference, performance wise? I imagine that if Users had a thousand records, and UserRoles had 10 records, then the JOIN would create a cartesian product of the two tables, resulting in 10,000 records in the table before the WHERE conditions are applied. However, if only three of the UserRoles is set to Active, would that mean that the resulting table, before applying WHERE conditions, would only contain 3000 records?
Thanks for whatever information you can provide.
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May 12, 2014
,I am creating a database where each record is required to have a twin record in the database.These is a type a value and a type b value and both must be present for the record to be valid.
Customer_ID, Order_Type, Product_Code
54, a, 00345
54, b, 00356
Is this something that would have to be done programmatically, or is it possible to create a constraint of some sort to ensure this?
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