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)

更新于: 27-Sep-2019

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