Hi,
Inside of a stored procedure I'm doing the following
SELECT T.LineId,T.Qty
FROM TransactionRows AS T
WHERE T.ArticleId = @ArticleId AND T.LotNumber = @LotNumber;
@ArticleId contains the "article number" that I want to select, and @LotNumber contains the "lot number".
The problem is that @LotNumber might be an actual value, OR IT MIGHT BE NULL.
If @LotNumber is NULL, the SELECT above FAILS. However, if it is NOT NULL, it doesn't fail.
After many years working with databases I hadn't realized this until now 
....
To get the correct row(s), if @LotNumber is null, I would have to write:
SELECT T.LineId,T.Qty
FROM TransactionRows AS T
WHERE T.ArticleId = @ArticleId AND T.LotNumber IS NULL
The complete statement would be:
IF @LotNumber IS NULL THEN
SELECT T.LineId,T.Qty
FROM TransactionRows AS T
WHERE T.ArticleId = @ArticleId AND T.LotNumber IS NULL;
ELSE
SELECT T.LineId,T.Qty
FROM TransactionRows AS T
WHERE T.ArticleId = @ArticleId AND T.LotNumber = @LotNumber;
END IF;
Is there a more elegant way of doing this?
Thanks,
Edgard