MySQL查询将特定记录放在顶部
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)