sql server中isnull(Null,0) 和isnull(' ',0) 区别
SELECT ISNULL(NULL,0) WHERE ISNULL(NULL,0)=0 SELECT ISNULL(' ',0) WHERE ISNULL(' ',0)=0SELECT ISNULL(NULL,0) WHERE ISNULL(NULL,0)='0'SELECT ISNULL(' ',0) WHERE ISNULL(' ',0)='0'上面sql看似没有多大区别,但是当你踩过坑之后就明白还是有区别的。isnull(null,0)=0 isnull(null,0)='0'都是对的但是isnull(' ',0)=0是对的 isnull(' ',0)='0'就不对了测试一下就知道: