Fetch maximum individual marks for a student with marks1 and marks2 records in MySQL?
For this, use MAX() along with GROUP BY clause. Let us first create a table −
mysql> create table DemoTable
-> (
-> StudentEmailId varchar(20),
-> Marks1 int,
-> Marks2 int
-> );
Query OK, 0 rows affected (0.90 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John@gmail.com',45,32);
Query OK, 1 row affected (0.30 sec)
mysql> insert into DemoTable values('John@gmail.com',32,45);
Query OK, 1 row affected (0.34 sec)
mysql> insert into DemoTable values('Carol@gmail.com',32,45);
Query OK, 1 row affected (1.64 sec)
mysql> insert into DemoTable values('David@gmail.com',45,32);
Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −
mysql> select *from DemoTable ;
This will produce the following output −
+-----------------+--------+--------+
| StudentEmailId | Marks1 | Marks2 |
+-----------------+--------+--------+
| John@gmail.com | 45 | 32 |
| John@gmail.com | 32 | 45 |
| Carol@gmail.com | 32 | 45 |
| David@gmail.com | 45 | 32 |
+-----------------+--------+--------+
4 rows in set (0.00 sec)
Here is the query to fetch maximum individual marks for a student with marks1 and marks2 records −
mysql> select StudentEmailId,max(Marks1),max(Marks2) from DemoTable
-> group by StudentEmailId;
This will produce the following output −
+-----------------+-------------+-------------+
| StudentEmailId | max(Marks1) | max(Marks2) |
+-----------------+-------------+-------------+
| John@gmail.com | 45 | 45 |
| Carol@gmail.com | 32 | 45 |
| David@gmail.com | 45 | 32 |
+-----------------+-------------+-------------+
3 rows in set (0.00 sec)
Published on 18-Dec-2019 09:35:52
