Get the sum of columns for duplicate records in MySQL

For this, use GROUP BY clause along with aggregate function SUM(). Let us first create a table −

mysql> create table DemoTable(
   Name varchar(100),
   Score int
);
Query OK, 0 rows affected (0.70 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Adam',50);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('Bob',80);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('Adam',70);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('Adam',10);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Carol',98);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('Bob',10);
Query OK, 1 row affected (0.08 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+-------+
| Name  | Score |
+-------+-------+
| Adam  |    50 |
| Bob   |    80 |
| Adam  |    70 |
| Adam  |    10 |
| Carol |    98 |
| Bob   |    10 |
+-------+-------+
6 rows in set (0.00 sec)

Following is the query to get the sum of columns for duplicate records in MySQL −

mysql> select Name,sum(Score) from DemoTable group by Name;

This will produce the following output −

+-------+------------+
| Name  | sum(Score) |
+-------+------------+
| Adam  |        130 |
| Bob   |         90 |
| Carol |         98 |
+-------+------------+
3 rows in set (0.00 sec)