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How to calculate value from multiple columns in MySQL?
To calculate a value from multiple columns, use GROUP BY. Following is the syntax −
select yourColumnName1,sum(yourColumnName2*yourColumnName3) AS anyAliasName from yourTableName group by yourColumnName1;
Let us first create a table −
mysql> create table calculateValueDemo -> ( -> Id int, -> ProductPrice int, -> ProductWeight int -> ); Query OK, 0 rows affected (0.56 sec)
Following is the query to insert records in the table using insert command −
mysql> insert into calculateValueDemo values(100,35,5); Query OK, 1 row affected (0.16 sec) mysql> insert into calculateValueDemo values(101,50,3); Query OK, 1 row affected (0.16 sec) mysql> insert into calculateValueDemo values(100,100,4); Query OK, 1 row affected (0.17 sec) mysql> insert into calculateValueDemo values(101,500,2); Query OK, 1 row affected (0.22 sec)
Following is the query to display all records from the table using select statement −
mysql> select * from calculateValueDemo;
This will produce the following output −
+------+--------------+---------------+ | Id | ProductPrice | ProductWeight | +------+--------------+---------------+ | 100 | 35 | 5 | | 101 | 50 | 3 | | 100 | 100 | 4 | | 101 | 500 | 2 | +------+--------------+---------------+ 4 rows in set (0.00 sec)
Here is the query to calculate the value from multiple columns −
mysql> select Id,sum(ProductPrice*ProductWeight) AS Total from calculateValueDemo group by Id;
This will produce the following output −
+------+-------+ | Id | Total | +------+-------+ | 100 | 575 | | 101 | 1150 | +------+-------+ 2 rows in set (0.00 sec)
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