Add records from corresponding duplicate values in another column with MySQL

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

mysql> create table DemoTable
   -> (
   -> Name varchar(20),
   -> Value int
   -> );
Query OK, 0 rows affected (2.08 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Chris',50);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('David',90);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('Chris',60);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable values('Bob',100);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('David',80);
Query OK, 1 row affected (0.21 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable;

This will produce the following output −

+-------+-------+
| Name  | Value |
+-------+-------+
| Chris | 50    |
| David | 90    |
| Chris | 60    |
| Bob   | 100   |
| David | 80    |
+-------+-------+
5 rows in set (0.00 sec)

Following is the query to add records from duplicate values in another column −

mysql> select Name,sum(Value) as GrandTotal from DemoTable group by Name;

This will produce the following output −

+-------+------------+
| Name  | GrandTotal |
+-------+------------+
| Chris |        110 |
| David |        170 |
| Bob   |        100 |
+-------+------------+
3 rows in set (0.03 sec)