MySQL SELECT to sum a column value with previous value
For this, you can use a session variable. Let us first create a table −
mysql> create table DemoTable809(Price int);
Query OK, 0 rows affected (0.53 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable809 values(40);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable809 values(50);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable809 values(60);
Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable809;
This will produce the following output −
+-------+
| Price |
+-------+
| 40 |
| 50 |
| 60 |
+-------+
3 rows in set (0.00 sec)
Following is the query to sum a column value with a previous value −
mysql> select @currentSum:=@currentSum+Price from DemoTable809;
This will produce the following output −
+--------------------------------+
| @currentSum:=@currentSum+Price |
+--------------------------------+
| 40 |
| 90 |
| 150 |
+--------------------------------+
3 rows in set (0.00 sec)
Published on 03-Sep-2019 14:21:46
