MySQL 按首字母排序？

要按第一个字母排序，请使用 ORDER BY CASE 语句。让我们首先创建一个表：

mysql> create table DemoTable1535
   -> (
   -> Value varchar(100)
   -> );
Query OK, 0 rows affected (2.26 sec)

使用插入命令在表中插入一些记录：

mysql> insert into DemoTable1535 values('MySQL is good relational database.');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable1535 values('is MySQL easy to lean');
Query OK, 1 row affected (0.35 sec)
mysql> insert into DemoTable1535 values('You need to start basic SQL');
Query OK, 1 row affected (0.35 sec)

使用 select 语句显示表中的所有记录：

mysql> select * from DemoTable1535;

这将产生以下输出：

+------------------------------------+
| Value                              |
+------------------------------------+
| MySQL is good relational database. |
| is MySQL easy to lean              |
| You need to start basic SQL        |
+------------------------------------+
3 rows in set (0.00 sec)

以下是按第一个字母排序的查询：

mysql> select * from DemoTable1535
    -> order by case when left(Value, 1) = 'i' then 1 else 2 end,Value;

这将产生以下输出：

+------------------------------------+
| Value                              |
+------------------------------------+
| is MySQL easy to lean              |
| MySQL is good relational database. |
| You need to start basic SQL        |
+------------------------------------+
3 rows in set (0.00 sec)