在 MySQL 中实现自定义排序顺序


要在 MySQL 中实现自定义排序顺序,你需要使用 ORDER BY FIELD()。我们首先创建一个表,代码如下 −

mysql> create table DemoTable
   -> (
   -> Designation varchar(100)
   -> );
Query OK, 0 rows affected (1.65 sec)

使用 insert 命令向表中插入一些记录,代码如下 −

mysql> insert into DemoTable values('Software Engineer');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('Associate Software Engineer');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable values('Software Development Engineer');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('Product Manager');
Query OK, 1 row affected (0.17 sec)

使用 select 语句显示表中的所有记录,代码如下 −

mysql> select *from DemoTable;

这会生成以下输出 −

+-------------------------------+
| Designation                   |
+-------------------------------+
| Software Engineer             |
| Associate Software Engineer   |
| Software Development Engineer |
| Product Manager               |
+-------------------------------+
4 rows in set (0.00 sec)

以下是实现 MySQL 中自定义排序顺序的查询 −

mysql> select *from DemoTable
   -> order by
field(Designation,'Associate Software Engineer','Software Engineer','Software Development Engineer','Product Manager');

这会生成以下输出 −

+-------------------------------+
| Designation                   |
+-------------------------------+
| Associate Software Engineer   |
| Software Engineer             |
| Software Development Engineer |
| Product Manager               |
+-------------------------------+
4 rows in set (0.02 sec)

更新于:2019 年 12 月 13 日

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