row_number replacement

Question

row_number replacement

komal145

SSCrazy Eights

Points: 9915
More actions
September 26, 2012 at 2:14 pm

#282306

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_STEPMAX_STEP WITH (NOLOCK)
JOIN TablebB 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

Viewing 4 posts - 1 through 3 (of 3 total)

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Sean Lange SSC Guru Points: 286590 More actions · Answer 1

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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brendan woulfe Hall of Fame Points: 3888 More actions · Answer 2

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.

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 3

komal145 (9/26/2012)
...
UPDATE TableC
SET step_desc= Tableb.StepDescription
FROM #MAX_STEPMAX_STEP WITH (NOLOCK)
JOIN TablebB 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}

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