Yes, they will work the same.
Second one will evaluate to if 0 = 1
when @IS_EMAIL is null.
Вопрос
DECLARE @IS_EMAIL CHAR(1);
IF @IS_EMAIL = '1' .....
IF (ISNULL(@IS_EMAIL , '0') = '1') .....
Will those 2 condition resolve to the same result for every value of @IS_EMAIL
?
Решение
Yes, they will work the same.
Second one will evaluate to if 0 = 1
when @IS_EMAIL is null.
Другие советы
Yes. But consider the first one as it's easier to understand and it should be faster.