按设置顺序在 MySQL 中进行选择
为此,你需要使用 IN() 和 FIELD() 方法。我们首先创建一个表格 -
mysql> create table DemoTable( StudentId varchar(10), StudentName varchar(20) ) ; Query OK, 0 rows affected (4.11 sec)
使用插入命令在表格中插入一些记录 -
mysql> insert into DemoTable values('10001','Adam'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable values('1010','Chris'); Query OK, 1 row affected (0.72 sec) mysql> insert into DemoTable values('1020','Bob'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('1030','Carol'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values('1040','Sam'); Query OK, 1 row affected (0.29 sec)
使用选择语句显示表格中的所有记录 -
mysql> select *from DemoTable;
这将产生以下输出 -
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 10001 | Adam | | 1010 | Chris | | 1020 | Bob | | 1030 | Carol | | 1040 | Sam | +-----------+-------------+ 5 rows in set (0.00 sec)
以下是按设置顺序在 MySQL 中选择的查询 -
mysql> select *from DemoTable where StudentId IN('1040','1010','1020','1030','10001') order by FIELD(StudentId,'1040','1010','1020','1030','10001');
这将产生以下输出 -
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1040 | Sam | | 1010 | Chris | | 1020 | Bob | | 1030 | Carol | | 10001 | Adam | +-----------+-------------+ 5 rows in set (0.02 sec)
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