MySQL 查询将特定记录置于顶部
mysqlmysqli database更新于 2025/12/23 20:28:17
为此，您可以使用 ORDER BY CASE 语句。让我们首先创建一个表 −
mysql> create table DemoTable ( StudentName varchar(100), StudentMarks int ); Query OK, 0 rows affected (0.97 sec)
使用 insert 命令在表中插入一些记录 −
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;
这将产生以下输出 −
+-------------+--------------+ | 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于顶部的查询 −
mysql> select *from DemoTable order by case StudentName when 'John' then 2 else 3 end, StudentName, StudentMarks;
这将产生以下输出 −
+-------------+--------------+ | StudentName | StudentMarks | +-------------+--------------+ | John | 67 | | John | 98 | | John | 99 | | Chris | 45 | | David | 89 | | Mike | 79 | +-------------+--------------+ 6 rows in set (0.00 sec)
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