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)

Anvi Jain

Updated on 30-Jul-2019 22:30:26

• Related Questions & Answers
• Perform MySQL UPDATE on the basis of DATE value in another column
• Show column value twice in MySQL Select?
• Perform MySQL SELECT on fields containing null values?
• Select data and set value to boolean based on timestamp column in MySQL
• How to perform element-wise multiplication on tensors in PyTorch?
• MySQL SELECT to sum a column value with previous value
• Perform case insensitive SELECT using MySQL IN()?
• Select a specific value between two column values in MySQL?
• How to select the maximum value of a column in MySQL?
• How to perform SELECT using COUNT in MySQL?
• Select minimum row value from a column with corresponding duplicate column values in MySQL
• Perform MySQL SELECT on dates inserted into the table as VARCHAR values
• Exclude rows based on column value when another duplicate column value is found in MySQL?
• C++ Program to Perform Matrix Multiplication
• How to select distinct value from one MySQL column only?