Question

The following T-SQL code segment works but i’m wondering if there’s a cleverer and/or less verbose way to accomplish the swapping of field values between two different rows. (The code has hard-coded pkey values for simplicity.)

BEGIN TRAN;

declare @swapFormSeqA int;
declare @swapFormSeqB int;

SELECT @swapFormSeqA = DisplaySeq
FROM CustomCatalogForm
WHERE CustomCatalogFormId = 1;

SELECT @swapFormSeqB = DisplaySeq
FROM CustomCatalogForm
WHERE CustomCatalogFormId = 2;

UPDATE CustomCatalogForm
SET DisplaySeq = @swapFormSeqB
WHERE CustomCatalogFormId = 1;

UPDATE CustomCatalogForm
SET DisplaySeq = @swapFormSeqA
WHERE CustomCatalogFormId = 2;

COMMIT TRAN;

EDIT: i’m using Sql2k5 specifically so 2k8 is not an option.

Answer 1

You could do like this:

begin tran

declare @sum int

select @sum = sum(DisplaySeq)
from CustomCatalogForm
where CustomCatalogFormId in (1,2)

update CustomCatalogForm
set DisplaySeq = @sum - DisplaySeq
where CustomCatalogFormId in (1,2)

commit tran