如何在MySQL中将DATETIME转换为DATE？
要将DATETIME转换为MySQL中的DATE，请使用CAST()函数。语法如下-
select cast(yourColumnName as Date) as anyVariableName from yourTableName;
要了解上述语法，让我们首先创建一个表-
mysql> create table ConvertDatetimeToDate −> ( −> YourDatetime datetime −> );
借助insert命令将datetime插入表中。查询如下-
mysql> insert into ConvertDatetimeToDate values(date_add(now(),interval 1 day)); mysql> insert into ConvertDatetimeToDate values(date_add(now(),interval -1 day)); mysql> insert into ConvertDatetimeToDate values(date_add(now(),interval 1 year)); mysql> insert into ConvertDatetimeToDate values(date_add(now(),interval -1 year));
显示上面插入的所有记录。查询如下-
mysql> select *from ConvertDatetimeToDate;
以下是输出-
+---------------------+ | YourDatetime | +---------------------+ | 2018-11-28 16:12:50 | | 2018-11-26 16:13:00 | | 2019-11-27 16:13:13 | | 2017-11-27 16:13:24 | +---------------------+ 4 rows in set (0.00 sec)
现在，您可以应用上述语法将datetime强制转换为date。查询如下-
mysql> select cast(YourDatetime as Date) as OnlyDateDemo from ConvertDatetimeToDate;
以下是输出-
+--------------+ | OnlyDateDemo | +--------------+ | 2018-11-28 | | 2018-11-26 | | 2019-11-27 | | 2017-11-27 | +--------------+ 4 rows in set (0.00 sec)