How to create conditions in a MySQL table with multiple columns?

For conditions, use IF(). Following is the syntax −

IF(yourCondition, trueStatement,falseStatement);

Let us first create a table −

mysql> create table DemoTable612 (Number1 int,Number2 int,Score int); Query OK, 0 rows affected (0.47 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable612 values(10,20,1000); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable612 values(30,40,500); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable612 values(50,70,1200); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable612 values(100,120,400); Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable612;

This will produce the following output −

+---------+---------+-------+ | Number1 | Number2 | Score | +---------+---------+-------+ |      10 |      20 | 1000  | |      30 |      40 | 500   | |      50 |      70 | 1200  | |     100 |     120 | 400   | +---------+---------+-------+ 4 rows in set (0.00 sec)

Here is the query to create conditions in MySQL −

mysql> select *,If(Score > 500, Number1*Number2,Number1+Number2) AS Result from DemoTable612;

This will produce the following output −

+---------+---------+-------+--------+ | Number1 | Number2 | Score | Result | +---------+---------+-------+--------+ | 10 | 20 | 1000 | 200 | | 30 | 40 | 500 | 70 | | 50 | 70 | 1200 | 3500 | | 100 | 120 | 400 | 220 | +---------+---------+-------+--------+ 4 rows in set (0.00 sec)