如果在where 子句中包含 datetime类型,是否允许在 where 子句中使用MySQL日期函数,好像是不可以的,为什么?如 where year(F) > 2003 这样的操作要报错,MySQL这种语法真的不支持么?
select year(register_time) as y from user 正常允许select year(register_time) as y from user where y>2005 运行报错 错误信息如下所示: ERROR 1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ERROR 1054 : Unknown column 'y' in 'where clause'' at line 1这是怎么回事?
select year(register_time) as y from user where year(register_time) >2005
select month(制单日期),count(*) from t group by month(制单日期) select month(制单日期),制单日期 from t where month(制单日期) > 10 以上两语句都没有问题啊
SELECT * FROM TT WHERE F1 BETWEEN '2009-11-1 00:00:15' AND '2009-11-05 12:12:11'
如何对datetime类型进行按月份的group统计操作呢?
求相应的SQL语句:)
显示的结果好像不对,怎么回事?
错误信息如下所示:
ERROR 1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ERROR 1054 : Unknown column 'y' in 'where clause'' at line 1这是怎么回事?
select month(制单日期),制单日期 from t where month(制单日期) > 10
以上两语句都没有问题啊