2015年9月3日
mysql中的NULL的判断
摘要： mysql> delete from `zhangchao` where x='NULL'; Query OK, 0 rows affected (0.00 sec) mysql> delete from `zhangchao` where x=NULL; Query OK, 0 rows affected (0.00 sec) mysql> select * from zhangcha... 阅读全文
posted @ 2015-09-03 13:25 justinzhang 阅读(7943) 评论(0) 推荐(0) 编辑