How to select multiple max values which would be duplicate values as well in MYSQL?

For this, use the join concept. Let us first create a −

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

Insert some records in the table using insert command. Here, we have inserted duplicate values as well −

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)

Display all records from the table using select statement −

mysql> select * from  DemoTable1389;

This will produce the following output −

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

Following is the query to select multiple max values −

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

This will produce the following output displaying max value, with the duplicates as well −

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