SQL Server Check for IsNull and for Zero

Question

I have the following:

set @SomeVariable = @AnotherVariable/isnull(@VariableEqualToZero,1) - 1 

If @VariableEqualToZero is null it substitutes t

Answer 1

If you're using SQL Server, you can probably use a NULLIF statement?
i.e. set the value to NULL if it's 0 then set it to 1 if it's NULL - should catch for both 0's and NULLs:

SET @SomeVariable = @AnotherVariable/ISNULL(NULLIF(@VariableEqualToZero,0),1) - 1