在 MySQL 表格中为某个值增加 30 天?
若要向表中的值中添加 30 天,可以通过结合 ADDDATE() 函数和 UPDATE 命令来实现。语法如下
UPDATE yourTableName SET yourDateColumnName=ADDDATE(yourDateColumnName,INTERVAL 30 DAY);
为了理解上述语法,我们创建一个表。创建表的查询如下
mysql> create table Add30DayDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> ShippingDate date, -> PRIMARY KEY(ID) -> ); Query OK, 0 rows affected (0.76 sec)
通过插入命令在表中插入一些记录。查询如下
mysql> insert into Add30DayDemo(ShippingDate) values('2019-02-04'); Query OK, 1 row affected (0.20 sec) mysql> insert into Add30DayDemo(ShippingDate) values('2018-11-15'); Query OK, 1 row affected (0.18 sec) mysql> insert into Add30DayDemo(ShippingDate) values('2013-05-18'); Query OK, 1 row affected (0.15 sec) mysql> insert into Add30DayDemo(ShippingDate) values('2017-08-25'); Query OK, 1 row affected (0.20 sec) mysql> insert into Add30DayDemo(ShippingDate) values('2016-03-01'); Query OK, 1 row affected (0.12 sec) mysql> insert into Add30DayDemo(ShippingDate) values('2015-09-03'); Query OK, 1 row affected (0.13 sec)
使用 select 语句显示表中的所有记录。查询如下
mysql> select *from Add30DayDemo;
输出如下
+----+--------------+ | Id | ShippingDate | +----+--------------+ | 1 | 2019-02-04 | | 2 | 2018-11-15 | | 3 | 2013-05-18 | | 4 | 2017-08-25 | | 5 | 2016-03-01 | | 6 | 2015-09-03 | +----+--------------+ 6 rows in set (0.00 sec)
以下是使用 DATEADD() 将 30 天值添加到表中的查询
mysql> update Add30DayDemo -> SET ShippingDate=ADDDATE(ShippingDate,INTERVAL 30 DAY); Query OK, 6 rows affected (0.44 sec) Rows matched: 6 Changed: 6 Warnings: 0
现在再次检查表记录。查询如下
mysql> select *from Add30DayDemo;
以下是具有更新日期的输出
+----+--------------+ | Id | ShippingDate | +----+--------------+ | 1 | 2019-03-06 | | 2 | 2018-12-15 | | 3 | 2013-06-17 | | 4 | 2017-09-24 | | 5 | 2016-03-31 | | 6 | 2015-10-03 | +----+--------------+ 6 rows in set (0.00 sec)
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