使用MySQL IF语句更新表中的多个值
让我们首先创建一个表-
create table DemoTable716 (Id varchar(100),
Value1 int,
Value2 int,
Value3 int
);
使用插入命令在表中插入一些记录-
insert into DemoTable716 values('100',45,86,79);insert into DemoTable716 values('101',67,67,99);
insert into DemoTable716 values('102',77,57,98);
insert into DemoTable716 values('103',45,67,92);
使用select语句显示表中的所有记录-
select *from DemoTable716;
这将产生以下输出-
+------+--------+--------+--------+| Id | Value1 | Value2 | Value3 |
+------+--------+--------+--------+
| 100 | 45 | 86 | 79 |
| 101 | 67 | 67 | 99 |
| 102 | 77 | 57 | 98 |
| 103 | 45 | 67 | 92 |
+------+--------+--------+--------+
4 rows in set (0.00 sec)
以下是更新表中多个值的查询-
update DemoTable716set Value3=if(Value1=67 OR Value2=67,67,NULL) where Id='101';
Rows matched: 1 Changed: 1 Warnings: 0
让我们再次检查表记录-
select *from DemoTable716;
这将产生以下输出-
+------+--------+--------+--------+| Id | Value1 | Value2 | Value3 |
+------+--------+--------+--------+
| 100 | 45 | 86 | 79 |
| 101 | 67 | 67 | 67 |
| 102 | 77 | 57 | 98 |
| 103 | 45 | 67 | 92 |
+------+--------+--------+--------+
4 rows in set (0.00 sec)
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