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Editorial Team
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Asked: 2026-06-08T17:45:26+00:00

Am updating my sql table using while loops , In my table records id

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Am updating my sql table using while loops , In my table records “id” are in this order 27,28,29,30 upto 45. am trying to update thise “id” into 2,3,4,5 upto 16 i used this loop but am getting error only 

DECLARE @a INT 
DECLARE @b INT
SET @a = 2
SET @b = 27
WHILE @b < 42
BEGIN
exec sp_executesql 'UPDATE Cpart2_TEST_2 SET id = @a where id = @b   

SET @a = @a + 1
SET @b = @b + 1
END

This is the error message

1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to
use near ‘DECLARE @a INT

DECLARE @b INT
SET @a = 2
SET @b = 27
WHILE @b < 42
BEGIN
' at line 1
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1 Answer

  1. Editorial Team

    Change your exec line to:

    exec sp_executesql 'UPDATE Cpart2_TEST_2 SET id = ' + CAST(@a AS nvarchar(3)) + ' where id = + ' CAST(@b AS nvarchar(3))

    I haven’t parsed this so it may have syntax errors. But get that working, and you should be good.

    One thing to consider… if ‘id’ is an IDENTITY column, you will probably not be able to alter it.

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