在带有到达日期记录的MySQL表中添加30天迄今为止的日期
使用INTERVAL更新MySQL表列中所有日期的日期。让我们首先创建一个表-
mysql> create table DemoTable814(ArrivalDate date);
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable814 values('2018-12-02');
mysql> insert into DemoTable814 values('2017-03-12');
mysql> insert into DemoTable814 values('2019-12-23');
mysql> insert into DemoTable814 values('2016-06-01');
mysql> insert into DemoTable814 values('2019-08-03');使用select语句显示表中的所有记录-
mysql> select *from DemoTable814;
这将产生以下输出-
+-------------+ | ArrivalDate | +-------------+ | 2018-12-02 | | 2017-03-12 | | 2019-12-23 | | 2016-06-01 | | 2019-08-03 | +-------------+ 5 rows in set (0.00 sec)
以下是迄今为止添加30天的查询-
mysql> select ArrivalDate+ Interval 30 Day from DemoTable814;
这将产生以下输出-
+------------------------------+ | ArrivalDate+ Interval 30 Day | +------------------------------+ | 2019-01-01 | | 2017-04-11 | | 2020-01-22 | | 2016-07-01 | | 2019-09-02 | +------------------------------+ 5 rows in set (0.05 sec)