如何更新 MySQL 日期类型列?
mysqlmysqli database
首先我们创建一个表 −
mysql> create table DemoTable1451 -> ( -> JoiningDate date -> ); Query OK, 0 rows affected (0.52 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1451 values('2019-07-21');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable1451 values('2018-01-31');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable1451 values('2017-06-01');
Query OK, 1 row affected (0.20 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1451;
这将产生以下输出 −
+-------------+ | JoiningDate | +-------------+ | 2019-07-21 | | 2018-01-31 | | 2017-06-01 | +-------------+ 3 rows in set (0.00 sec)
以下是更新日期类型列的查询。我们将日期记录增加年份 −
mysql> update DemoTable1451 set JoiningDate=date_add(JoiningDate, interval 1 year); Query OK, 3 rows affected (0.15 sec) Rows matched: 3 Changed: 3 Warnings: 0
让我们再次检查表记录 −
mysql> select * from DemoTable1451;
这将产生以下输出 −
+-------------+ | JoiningDate | +-------------+ | 2020-07-21 | | 2019-01-31 | | 2018-06-01 | +-------------+ 3 rows in set (0.00 sec)
