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MySQL查询将特定记录放在顶部

2024-05-09 00:09:05 415

为此，您可以使用ORDERBYCASE语句。让我们首先创建一个表-

mysql> create table DemoTable
(
   StudentName varchar(100),
   StudentMarks int
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('Chris',45);
mysql> insert into DemoTable values('John',67);
mysql> insert into DemoTable values('David',89);
mysql> insert into DemoTable values('John',98);
mysql> insert into DemoTable values('Mike',79);
mysql> insert into DemoTable values('John',99);

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)

以下是将特定记录放在顶部的查询-

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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MySQL查询将特定记录放在顶部

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