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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)
Updated on: 03-Sep-2019
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