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)