row_number replacement

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row_number replacement

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komal145

Posted Wednesday, September 26, 2012 2:14 PM

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Hi friends,

I have created temp table with row_number() since i need the latest loanumber with step

Create Table #Max_step
(
Loan_number varchar(10),
FID Int,
Step int,
Modifieddate datetime,
ROW_id int
)

Create table Tableb
(loan_number varchar(10),
step int,
Description varchar(20))

Insert into #Max_step values('91746',1110,2,'2010-07-31 19:34:35.000',2)
Insert into #Max_step values('91746',1120,1,'2010-07-31 19:30:35.000',3)
Insert into #Max_step values('91746',1120,3,'2010-07-31 19:30:35.000',1)

Insert into Tableb values('91746',1,'description1')
Insert into Tableb values('91746',2,'description2')

I am trying to update a column in TableB based on the row_id =2 from max_step

but every time i check the target column value changes ..example
updating Column in tableC where max_step.row_id=2 joined with tableB on step and loanumber.

UPDATE TableC
SET step_desc= Tableb.StepDescription
FROM #MAX_STEP MAX_STEP WITH (NOLOCK)
JOIN Tableb B WITH (NOLOCK) ON MAX_STEP.LoanNumber = b.LoanNumber
and MAx_step.Step=b.step

WHERE MAX_STEP.Row_ID = 2

Can Anyone tell me whats the best way to replace row_number() while getting data into max_step table

Post #1364924

Sean Lange

Posted Wednesday, September 26, 2012 3:46 PM

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Can you ddl and sample data for TableC? Also, a clear explanation what you are trying would help. I am not sure I understand your requirements.

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Post #1364959

brendan woulfe

Posted Thursday, September 27, 2012 7:12 AM

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I don't see what's wrong with your query other than you don't have a loannumber column. It is loan_number.

Post the ddl and sample data for TableC and give expected output and someone should be able to help.

Post #1365225

ChrisM@Work

Posted Thursday, September 27, 2012 7:29 AM

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komal145 (9/26/2012)

...
UPDATE TableC
SET step_desc= Tableb.StepDescription
FROM #MAX_STEP MAX_STEP WITH (NOLOCK)
JOIN Tableb B WITH (NOLOCK) ON MAX_STEP.LoanNumber = b.LoanNumber
and MAx_step.Step=b.step

WHERE MAX_STEP.Row_ID = 2...

This is an unrestricted update. Every row in tableC will be updated to the same value of step_desc, because TableC isn't referenced in the FROM list. Since it's a trivial matter to convert a SELECT...FROM into an UPDATE...FROM, why don't you write it and post it here? What you want is a query which will return step_desc from TableC and Tableb.StepDescription.

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps

Post #1365249

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