sqlserver 中isnull(Null,0) 和isnull(' ',0) 区别

SELECT ISNULL(NULL,0) WHERE ISNULL(NULL,0)=0 SELECT ISNULL(' ',0) WHERE ISNULL(' ',0)=0 SELECT 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

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