极客教程如何在MySQL中更新除单个值外的所有条目中的特定列？
要在忽略单个值的情况下更新所有条目，需要使用IF()。
首先让我们创建一个表 –
mysql> create table DemoTable736 (
CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
CustomerName varchar(100),
isMarried boolean
);
Query OK, 0 rows affected (0.53 sec)
使用insert命令在表中插入一些记录 –
mysql> insert into DemoTable736(CustomerName,isMarried) values('Chris',0);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable736(CustomerName,isMarried) values('Robert',0);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable736(CustomerName,isMarried) values('David',0);
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable736(CustomerName,isMarried) values('Mike',0);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable736(CustomerName,isMarried) values('Carol',1);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable736(CustomerName,isMarried) values('Bob',0);
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 DemoTable736;
输出如下 –
+------------+--------------+-----------+
| CustomerId | CustomerName | isMarried |
+------------+--------------+-----------+
| 1 | Chris | 0 |
| 2 | Robert | 0 |
| 3 | David | 0 |
| 4 | Mike | 0 |
| 5 | Carol | 1 |
| 6 | Bob | 0 |
+------------+--------------+-----------+
6 rows in set (0.00 sec)
以下是使用MySQL更新特定列中的除单个值外的所有条目的查询。 在这里，我们正在更新“isMarried”列 –
mysql> update DemoTable736 set isMarried=if(CustomerId=5,1,1);
Query OK, 5 rows affected (0.13 sec)
Rows matched: 6 Changed: 5 Warnings: 0
让我们再次检查表记录 –
mysql> select *from DemoTable736;
输出如下 –
+------------+--------------+-----------+
| CustomerId | CustomerName | isMarried |
+------------+--------------+-----------+
| 1 | Chris | 1 |
| 2 | Robert | 1 |
| 3 | David | 1 |
| 4 | Mike | 1 |
| 5 | Carol | 1 |
| 6 | Bob | 1 |
+------------+--------------+-----------+
6 rows in set (0.00 sec)
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