MySQL 如何在SELECT语句中使用MySQL IF()函数？

通过在IF()函数的第一个参数中提供列名和条件，很容易在SELECT语句中使用MySQL IF()函数。为了理解它，考虑来自表“Students”的以下数据。

mysql> Select * from Students;
+----+-----------+-----------+----------+----------------+
| id | Name      | Country   | Language | Course         |
+----+-----------+-----------+----------+----------------+
| 1  | Francis   | UK        | English  | Literature     |
| 2  | Rick      | USA       | English  | History        |
| 3  | Correy    | USA       | English  | Computers      |
| 4  | Shane     | France    | French   | Computers      |
| 5  | Validimir | Russia    | Russian  | Computers      |
| 6  | Steve     | Australia | English  | Geoinformatics |
| 7  | Rahul     | India     | Hindi    | Yoga           |
| 8 | Harshit | India | Hindi | Computers |
+----+-----------+-----------+----------+----------------+
8 rows in set (0.00 sec)

现在，通过使用IF()函数在SELECT语句中，我们将获得“学生”的名称和课程详情，如果他们使用英语，则输入“Eng_Language”，否则为“Other language”的信息。

mysql> Select Name, IF(Language = 'English', "Eng_Language", "Other Language") AS 'Native Language', Course from students;
+-----------+-----------------+----------------+
| Name      | Native Language | Course         |
+-----------+-----------------+----------------+
| Francis   | Eng_Language    | Literature     |
| Rick      | Eng_Language    | History        |
| Correy    | Eng_Language    | Computers      |
| Shane     | Other Language  | Computers      |
| Validimir | Other Language  | Computers      |
| Steve     | Eng_Language    | Geoinformatics |
| Rahul     | Other Language  | Yoga           |
| Harshit   | Other Language  | Computers      |
+-----------+-----------------+----------------+
8 rows in set (0.00 sec)

阅读更多：MySQL 教程