可将特定记录置顶的 MySQL 查询
为此,你可以使用 ORDER BY CASE 语句。我们先创建一个表 −
mysql> create table DemoTable ( StudentName varchar(100), StudentMarks int ); Query OK, 0 rows affected (0.97 sec)
使用 insert 命令向表中插入一些记录 −
mysql> insert into DemoTable values('Chris',45);
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable values('John',67);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('David',89);
Query OK, 1 row affected (0.46 sec)
mysql> insert into DemoTable values('John',98);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('Mike',79);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('John',99);
Query OK, 1 row affected (0.11 sec)使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
将生成以下输出 −
+-------------+--------------+ | StudentName | StudentMarks | +-------------+--------------+ | Chris | 45 | | John | 67 | | David | 89 | | John | 98 | | Mike | 79 | | John | 99 | +-------------+--------------+ 6 rows in set (0.00 sec)
以下是将特定记录置顶的查询 −
mysql> select *from DemoTable order by case StudentName when 'John' then 2 else 3 end, StudentName, StudentMarks;
将生成以下输出 −
+-------------+--------------+ | StudentName | StudentMarks | +-------------+--------------+ | John | 67 | | John | 98 | | John | 99 | | Chris | 45 | | David | 89 | | Mike | 79 | +-------------+--------------+ 6 rows in set (0.00 sec)
广告
数据结构
网络
RDBMS
操作系统
Java
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP