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)