MySQL query for grouping and summing the values based on specific records

MySQLMySQLi Database

Use GROUP BY to group records, whereas SUM() function is used to add. Let us first create a table −

mysql> create table DemoTable
(
   Name varchar(40),
   Subject varchar(40),
   Marks int
);
Query OK, 0 rows affected (2.89 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Chris','MySQL',76);
Query OK, 1 row affected (0.32 sec)
mysql> insert into DemoTable values('Sam','MongoDB',86);
Query OK, 1 row affected (0.39 sec)
mysql> insert into DemoTable values('Mike','MySQL',98);
Query OK, 1 row affected (0.46 sec)
mysql> insert into DemoTable values('David','Java',93);
Query OK, 1 row affected (0.32 sec)
mysql> insert into DemoTable values('Bob','MySQL',57);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('John','MongoDB',77);
Query OK, 1 row affected (0.17 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+---------+-------+
| Name  | Subject | Marks |
+-------+---------+-------+
| Chris | MySQL   |    76 |
| Sam   | MongoDB |    86 |
| Mike  | MySQL   |    98 |
| David | Java    |    93 |
| Bob   | MySQL   |    57 |
| John  | MongoDB |    77 |
+-------+---------+-------+
6 rows in set (0.00 sec)

Following is the query to group and sum the values on the basis of SUBJECT −

mysql> select Subject,SUM(Marks) from DemoTable group by Subject;

This will produce the following output −

+---------+------------+
| Subject | SUM(Marks) |
+---------+------------+
| MySQL   |        231 |
| MongoDB |        163 |
| Java    |         93 |
+---------+------------+
3 rows in set (0.00 sec)
raja
Published on 04-Oct-2019 12:10:49
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