MySQL 查询以 45 天为间隔添加天数并在新列中显示输出
mysqlmysqli database更新于 2024/11/15 16:12:17
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 ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1930 values('2017-10-21');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1930 values('2019-12-14');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1930 values('2018-11-26');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1930 values('2014-06-16');
Query OK, 1 row affected (0.00 sec)
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)
相关文章
有用资源
mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
