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Cursor

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rkc01
Starting Member

43 Posts

Posted - 2003-02-02 : 19:26:06

I know cursors have been getting alot of attention here lately but this is an area where I have a hard time. I just think in terms of 1 result at a time, (as opposed to result sets). Here's the situation:

3 columns - empno, taxcode, YTDTaxbl (PK on empno, taxcode)

An employee can have multiple taxcodes, (33, 40, 60, etc...)

I want to take the higher value between tax code 33 and 60 and apply that value to both.

Example:

empno taxcode YTDTaxbl
101 33 $100.00
101 40 $70.00
101 60 $50.00

If employee number 101 has $100.00 YTDTaxbl for taxcode 33
and $50.00 for YTDTaxbl for taxcode 60, change the YTDTaxbl to $100.00 for taxcode 60. And vise versa if the higher YTDTaxbl amount is in taxcode 60. So then it would look like:

empno taxcode YTDTaxbl
101 33 $100.00
101 40 $70.00
101 60 $100.00

This is the code I used:


SET NOCOUNT ON
DECLARE @empno smallint
DECLARE ecursor CURSOR FOR 
  select distinct empno 
  from taxtable
  where taxcode in (33,60)


OPEN ecursor
FETCH NEXT FROM ecursor 
INTO @empno
WHILE @@FETCH_STATUS = 0

BEGIN
       update taxtable
       set ytdtxbl =
             (select max(ytdtxbl) from taxtable 
             where taxcode in (33,60)
             and empno = @empno)
 
      where taxcode in(33,60)
      and empno = @empno

   FETCH NEXT FROM ecursor 
   INTO @empno
END

CLOSE ecursor
DEALLOCATE ecursor
GO

How could I do the update on each employ without using the cursor?

Thx

-Rob

nr
SQLTeam MVY

12543 Posts

Posted - 2003-02-02 : 20:12:30

update taxtable
set ytdtxbl = (select max(t2.ytdtxbl) from taxtable t2
where t2.taxcode in (33,60)
and t2.empno = taxtable.empno)
where taxcode in(33,60)

==========================================
Cursors are useful if you don't know sql.
DTS can be used in a similar way.
Beer is not cold and it isn't fizzy.

rkc01
Starting Member

43 Posts

Posted - 2003-02-03 : 14:40:24

Thanks nr. Beautiful in it's simplicity.

-Rob

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