MySQL中添加新列并根据的IF条件设置值
要基于条件设置值,请使用IF()方法。让我们首先创建一个表-
create table DemoTable-> (
-> Age int
-> );
使用插入命令在表中插入一些记录-
insert into DemoTable values(19);insert into DemoTable values(16);
insert into DemoTable values(17);
insert into DemoTable values(22);
使用select语句显示表中的所有记录-
select *from DemoTable;
输出结果
这将产生以下输出-
+------+| Age |
+------+
| 19 |
| 16 |
| 17 |
| 22 |
+------+
4 rows in set (0.00 sec)
以下是根据条件设置值的查询-
select Age,if(Age > 18,'You are qualified!','Sorry, you are rejected!') AS Result fromDemoTable;
输出结果
这将产生以下输出-
+------+-------------------------+| Age | Result |
+------+-------------------------+
| 19 | You are qualified! |
| 16 | Sorry, you are rejected!|
| 17 | Sorry, you are rejected!|
| 22 | You are qualified! |
+------+-------------------------+
4 rows in set (0.00 sec)
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