Question

My question is can I do the functions of these two selects in a single statement and get rid of the IF?

DECLARE @recID INT;

--Case 1
SET @recID = null;
--Case 2
--SET @recID = 117;

IF @recID is null
BEGIN
    select * from myTable WHERE [myIDcolumn] is null    -- works when recID is null
END
ELSE
BEGIN
    select * from myTable WHERE [myIDcolumn] = @recID    -- works when recID is number
END

Answer 1

How ’bout this:

select *
from myTable
WHERE [myIDcolumn] = @recID or (@recID is null and [myIDcolumn] is null)

If @recID is null, the first part will never be true but the second part will be if [myIDcolumn] is null, which covers the null case. If @recID is not null, the first part will match when appropriate (and the second part will be ignored). So both cases are covered.