將字串作為 IF 語句結果返回的 MySQL 查詢？

我們首先建立一個表格 -

mysql> create table DemoTable
(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   EmployeeSalary int
);
Query OK, 0 rows affected (1.68 sec)

使用插入命令在表格中插入一些記錄 -

mysql> insert into DemoTable(EmployeeSalary) values(12000);
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable(EmployeeSalary) values(20000);
Query OK, 1 row affected (0.55 sec)
mysql> insert into DemoTable(EmployeeSalary) values(11500);
Query OK, 1 row affected (0.94 sec)
mysql> insert into DemoTable(EmployeeSalary) values(15500);
Query OK, 1 row affected (0.44 sec)

使用 select 語句從表格中顯示所有記錄 -

mysql> select *from DemoTable;

這將生成以下輸出 -

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

以下是查詢，它將字串作為 IF 語句的結果返回 -

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

這將生成以下輸出 -

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

AmitDiwan

更新日期：07-10-2019

403 次瀏覽

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