MySQL查询以45天为间隔添加天数并在新列中显示输出
为此，您可以使用date_add()。让我们首先创建一个表-
mysql> create table DemoTable1930 ( DueTime datetime );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1930 values('2017-10-21');
mysql> insert into DemoTable1930 values('2019-12-14');
mysql> insert into DemoTable1930 values('2018-11-26');
mysql> insert into DemoTable1930 values('2014-06-16');使用select语句显示表中的所有记录-
mysql> select * from DemoTable1930;
这将产生以下输出-
+---------------------+ | DueTime | +---------------------+ | 2017-10-21 00:00:00 | | 2019-12-14 00:00:00 | | 2018-11-26 00:00:00 | | 2014-06-16 00:00:00 | +---------------------+ 4 rows in set (0.00 sec)
这是添加天数的查询-
mysql> select DueTime,date_add(DueTime, interval 45 day) as ManyDays from DemoTable1930;
这将产生以下输出-
+---------------------+---------------------+ | DueTime | ManyDays | +---------------------+---------------------+ | 2017-10-21 00:00:00 | 2017-12-05 00:00:00 | | 2019-12-14 00:00:00 | 2020-01-28 00:00:00 | | 2018-11-26 00:00:00 | 2019-01-10 00:00:00 | | 2014-06-16 00:00:00 | 2014-07-31 00:00:00 | +---------------------+---------------------+ 4 rows in set (0.00 sec)