如何使用日期记录更新列值,并在当前日期之前将对应记录设置为1(SQL中)
假设当前日期为2019-08-20。现在,我们将创建一个表作为示例 –
mysql> create table DemoTable
(
ProductStatus tinyint(1),
ProductExpiryDate date
);
Query OK, 0 rows affected (1.03 sec)
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values(0,'2019-06-12');
Query OK, 1 row affected (0.43 sec)
mysql> insert into DemoTable values(0,'2019-10-11');
Query OK, 1 row affected (0.38 sec)
mysql> insert into DemoTable values(0,'2018-07-24');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values(0,'2018-09-05');
Query OK, 1 row affected (0.27 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 –
+---------------+-------------------+
| ProductStatus | ProductExpiryDate |
+---------------+-------------------+
| 0 | 2019-06-12 |
| 0 | 2019-10-11 |
| 0 | 2018-07-24 |
| 0 | 2018-09-05 |
+---------------+-------------------+
4 rows in set (0.00 sec)
以下是将记录设置为当前日期之前的值为1的查询-
mysql> update DemoTable
set ProductStatus=1
where ProductExpiryDate <=CURDATE();
Query OK, 3 rows affected (0.95 sec)
Rows matched : 3 Changed : 3 Warnings : 0
让我们再次检查表记录 –
mysql> select *from DemoTable;
这将产生以下输出 –
+---------------+-------------------+
| ProductStatus | ProductExpiryDate |
+---------------+-------------------+
| 1 | 2019-06-12 |
| 0 | 2019-10-11 |
| 1 | 2018-07-24 |
| 1 | 2018-09-05 |
+---------------+-------------------+
4 rows in set (0.00 sec)
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