Syntax error Perform multiplication in SELECT depending on column value in MySQL?

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)
Updated on: 2019-07-30T22:30:26+05:30

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