Perform multiplication in SELECT depending on column value in MySQL?
You can use CASE statement for this. Let us first create a table −
mysql> create table DemoTable
(
Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
Value1 int,
Value2 int
);
Query OK, 0 rows affected (0.76 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Value1,Value2) values(10,5);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable(Value1,Value2) values(20,0);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(Value1,Value2) values(40,10);
Query OK, 1 row affected (0.28 sec)
mysql> insert into DemoTable(Value1,Value2) values(50,0);
Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+--------+--------+
| Id | Value1 | Value2 |
+----+--------+--------+
| 1 | 10 | 5 |
| 2 | 20 | 0 |
| 3 | 40 | 10 |
| 4 | 50 | 0 |
+----+--------+--------+
4 rows in set (0.00 sec)
Following is the query to perform multiplication in SELECT depending on column value −
mysql> select Value1,Value2,
case when Value2 > 0 then Value1*Value2 else 0 end as Multiplication from DemoTable;
This will produce the following output −
+--------+--------+----------------+
| Value1 | Value2 | Multiplication |
+--------+--------+----------------+
| 10 | 5 | 50 |
| 20 | 0 | 0 |
| 40 | 10 | 400 |
| 50 | 0 | 0 |
+--------+--------+----------------+
4 rows in set (0.00 sec)
Published on 17-May-2019 17:23:31
