如何更新MySQL的日期类型列？

首先让我们创建一个表-

mysql> create table DemoTable1451
   -> (
   -> JoiningDate date
   -> );
Query OK, 0 rows affected (0.52 sec)

使用insert命令将一些记录插入表中

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)

这是更新一个日期类型列的查询。我们正在增加一年的日期记录-

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)

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