Use IF in select clause : IF « Flow Control « SQL / MySQL





Use IF in select clause

 
/*

mysql> select * from sales;
+-----+------------+--------+--------+--------+------+------------+
| num | name       | winter | spring | summer | fall | category   |
+-----+------------+--------+--------+--------+------+------------+
|   1 | Java       |   1067 |    200 |    150 |  267 | Holiday    |
|   2 | C          |    970 |    770 |    531 |  486 | Profession |
|   3 | JavaScript |     53 |     13 |     21 |  856 | Literary   |
|   4 | SQL        |    782 |    357 |    168 |  250 | Profession |
|   5 | Oracle     |    589 |    795 |    367 |  284 | Holiday    |
|   6 | MySQL      |    953 |    582 |    336 |  489 | Literary   |
|   7 | Cplus      |    752 |    657 |    259 |  478 | Literary   |
|   8 | Python     |     67 |     23 |     83 |  543 | Holiday    |
|   9 | PHP        |    673 |     48 |    625 |   52 | Profession |
+-----+------------+--------+--------+--------+------+------------+
9 rows in set (0.01 sec)

mysql> SELECT name AS Name, category AS Category,
    -> IF(winter>500, "Sells", "Slow") AS Trend
    -> FROM sales;
+------------+------------+-------+
| Name       | Category   | Trend |
+------------+------------+-------+
| Java       | Holiday    | Sells |
| C          | Profession | Sells |
| JavaScript | Literary   | Slow  |
| SQL        | Profession | Sells |
| Oracle     | Holiday    | Sells |
| MySQL      | Literary   | Sells |
| Cplus      | Literary   | Sells |
| Python     | Holiday    | Slow  |
| PHP        | Profession | Sells |
+------------+------------+-------+
9 rows in set (0.00 sec)


*/

Drop table sales;
  
CREATE TABLE sales(
    num MEDIUMINT NOT NULL AUTO_INCREMENT,
    name CHAR(20),
    winter INT,
    spring INT,
    summer INT,
    fall INT,
    category CHAR(13),
    primary key(num)
)type=MyISAM;


insert into sales value(1, 'Java', 1067 , 200, 150, 267,'Holiday');
insert into sales value(2, 'C',970,770,531,486,'Profession');
insert into sales value(3, 'JavaScript',53,13,21,856,'Literary');
insert into sales value(4, 'SQL',782,357,168,250,'Profession');
insert into sales value(5, 'Oracle',589,795,367,284,'Holiday');
insert into sales value(6, 'MySQL',953,582,336,489,'Literary');
insert into sales value(7, 'Cplus',752,657,259,478,'Literary');
insert into sales value(8, 'Python',67,23,83,543,'Holiday');
insert into sales value(9, 'PHP',673,48,625,52,'Profession');

select * from sales;

  
SELECT name AS Name, category AS Category,
IF(winter>500, "Sells", "Slow") AS Trend
FROM sales;
           
         
  










Related examples in the same category

1.The SQL syntax for IF branching looks like this: