让我们首先创建一个表-
mysql> create table DemoTable -> ( -> DueDate date ->);
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('2019-01-21'); mysql> insert into DemoTable values('2018-12-31'); mysql> insert into DemoTable values('2018-12-30'); mysql> insert into DemoTable values('2017-02-26');
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+------------+ | DueDate | +------------+ | 2019-01-21 | | 2018-12-31 | | 2018-12-30 | | 2017-02-26 | +------------+ 4 rows in set (0.00 sec)
这是向MySQL表中的DateTime字段添加一天的查询-
mysql> update DemoTable -> set DueDate=date_add(DueDate,interval 1 day); Rows matched: 4 Changed: 4 Warnings: 0
让我们再次检查表记录。
mysql> select *from DemoTable;
这将产生以下输出-
+------------+ | DueDate | +------------+ | 2019-01-22 | | 2019-01-01 | | 2018-12-31 | | 2017-02-27 | +------------+ 4 rows in set (0.00 sec)