SQL IF语句错误

Question

create view Com as
select C.id,
IF(A.agree = null) THEN
0
else A.agree
end if
+
IF(GA.agree = null) THEN
0
else GA.agree
end if
FROM
comments C left join AGREES A on A.id_comment=C.id left join GAGREES GA on GA.id_comment=C.id

此代码有语法错误我该如何解决这个问题？

Answer 1

= null并不意味着什么.你必须使用is null