对比
select * from emp where comm is null;
标签:补助,查找,comm,emp,null,不为 From: https://www.cnblogs.com/haha1988/p/17770011.html
对比
select * from emp where comm is null;
标签:补助,查找,comm,emp,null,不为 From: https://www.cnblogs.com/haha1988/p/17770011.html