使用MySQL INTERVAL向datetime字段添加一天

首先我们创建一个表 –

mysql> create table DemoTable
   -> (
   -> DueDate date
   ->);
Query OK, 0 rows affected (2.11 sec)

使用insert命令在表中插入一些记录 –

mysql> insert into DemoTable values('2019-01-21');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('2018-12-31');
Query OK, 1 row affected (0.47 sec)
mysql> insert into DemoTable values('2018-12-30');
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable values('2017-02-26');
Query OK, 1 row affected (0.47 sec)

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)

下面是向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);
Query OK, 4 rows affected (0.21 sec)
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)

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