如何在MYSQL中选择多个最大值，它们也是重复值？

为此，请使用join概念。首先创建一个-

mysql> create table DemoTable1389
   -> (
   -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentMarks int
   -> );
Query OK, 0 rows affected (2.73 sec)

使用insert命令向表中插入记录。这里，我们插入了重复值-

mysql> insert into DemoTable1389(StudentMarks) values(40);
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable1389(StudentMarks) values(40);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1389(StudentMarks) values(68);
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable1389(StudentMarks) values(78);
Query OK, 1 row affected (0.43 sec)
mysql> insert into DemoTable1389(StudentMarks) values(97);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable1389(StudentMarks) values(97);
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable1389(StudentMarks) values(97);
Query OK, 1 row affected (0.49 sec)

使用select语句显示表中的所有记录-

mysql> select * from  DemoTable1389;

这将产生以下输出-

+-----------+--------------+
| StudentId | StudentMarks |
+-----------+--------------+
|         1 |           40 |
|         2 |           40 |
|         3 |           68 |
|         4 |           78 |
|         5 |           97 |
|         6 |           97 |
|         7 |           97 |
+-----------+--------------+
7 rows in set (0.00 sec)

以下是选择多个最大值的查询-

mysql> select tbl.StudentId,tbl.StudentMarks from DemoTable1389 tbl
   -> join ( select max(StudentMarks) as MaxMarks from DemoTable1389) tbl1
   -> on tbl1.MaxMarks=tbl.StudentMarks;

这将产生以下显示最大值和重复项的输出-

+-----------+--------------+
| StudentId | StudentMarks |
+-----------+--------------+
|         5 |           97 |
|         6 |           97 |
|         7 |           97 |
+-----------+--------------+
3 rows in set (0.00 sec)

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