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)
Published on 03-Sep-2019 17:27:26
