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MySQL查询由于IF语句返回一个字符串？

2024-04-22 12:46:03 361

让我们首先创建一个表-

mysql> create table DemoTable
(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   EmployeeSalary int
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(EmployeeSalary) values(12000);
mysql> insert into DemoTable(EmployeeSalary) values(20000);
mysql> insert into DemoTable(EmployeeSalary) values(11500);
mysql> insert into DemoTable(EmployeeSalary) values(15500);

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-

+----+----------------+
| Id | EmployeeSalary |
+----+----------------+
|  1 | 12000          |
|  2 | 20000          |
|  3 | 11500          |
|  4 | 15500          |
+----+----------------+
4 rows in set (0.00 sec)

以下是作为IF语句的结果返回字符串的查询-

mysql> select Id,if(EmployeeSalary <= 12000 ,'Internship Employee','FullTime Employee') as status from DemoTable;

这将产生以下输出-

+----+---------------------+
| Id | status              |
+----+---------------------+
|  1 | Internship Employee |
|  2 | FullTime Employee   |
|  3 | Internship Employee |
|  4 | FullTime Employee   |
+----+---------------------+
4 rows in set (0.00 sec)

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MySQL查询由于IF语句返回一个字符串？

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