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MySQL查询显示多列的排名？

2024-05-14 21:18:59 368

为此，请使用FIND_IN_SET()方法。让我们首先创建一个表-

mysql> create table DemoTable634 (FirstName varchar(100),Marks int,Age int);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable634 values('John',60,23);
mysql> insert into DemoTable634 values('Chris',80,21);
mysql> insert into DemoTable634 values('Robert',70,24);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable634;

这将产生以下输出-

+-----------+-------+------+
| FirstName | Marks | Age  |
+-----------+-------+------+
| John      |    60 |   23 |
| Chris     |    80 |   21 |
| Robert    |    70 |   24 |
+-----------+-------+------+
3 rows in set (0.00 sec)

以下是显示多列等级的查询-

mysql> SELECT FirstName,Marks,Age,
   FIND_IN_SET( Marks,( SELECT GROUP_CONCAT( Marks ORDER BY Marks DESC ) FROM DemoTable634)) AS RankOfMarks,
   FIND_IN_SET(Age,( SELECT GROUP_CONCAT( Age ORDER BY Age DESC ) FROM DemoTable634) ) AS RankOfAge
   FROM DemoTable634;

这将产生以下输出，显示基于标记和年龄的排名-

+-----------+-------+------+-------------+-----------+
| FirstName | Marks | Age  | RankOfMarks | RankOfAge |
+-----------+-------+------+-------------+-----------+
| John      |    60 |   23 |           3 |         2 |
| Chris     |    80 |   21 |           1 |         3 |
| Robert    |    70 |   24 |           2 |         1 |
+-----------+-------+------+-------------+-----------+
3 rows in set (0.01 sec)

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MySQL查询显示多列的排名？

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