Use a CASE...WHEN function to indicate that the different categories have different sales trends : CASE « Function « SQL / MySQL






  1. SQL / MySQL
  2. Function
  3. CASE

Use a CASE...WHEN function to indicate that the different categories have different sales trends

      
mysql>
mysql> CREATE TABLE duck_sales(
    ->     design_num MEDIUMINT NOT NULL AUTO_INCREMENT,
    ->     design_name CHAR(20),
    ->     winter_sales INT,
    ->     spring_sales INT,
    ->     summer_sales INT,
    ->     fall_sales INT,
    ->     design_category CHAR(13),
    ->     primary key(design_num)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> insert into duck_sales(design_name, winter_sales, spring_sales, summer_sales, fall_sales, design_category)values
    -> ("Duck",1067,200,150,267,"Holiday"),
    -> ("Mac",970,770,531,486,"Profession"),
    -> ("Duckula",53,13,21,856,"Literary"),
    -> ("iPhone",782,357, 168, 250,"Profession"),
    -> ("HTML",589,795, 367, 284,"Holiday"),
    -> ("SQL",953,582, 336, 489,"Literary"),
    -> ("Sherlock_Duck",752,657, 259, 478,"Literary"),
    -> ("XML",67,23, 83 ,543,"Holiday"),
    -> ("Database",673,48,625,52,"Profession");
Query OK, 9 rows affected (0.00 sec)
Records: 9  Duplicates: 0  Warnings: 0

mysql>
mysql>
mysql> SELECT design_name AS Name,
    ->    CASE design_category
    ->       WHEN "Holiday" THEN "Seasonal"
    ->       WHEN "Profession" THEN "Bi_annual"
    ->       WHEN "Literary" THEN "Random" END AS "Pattern"
    -> FROM duck_sales;
+---------------+-----------+
| Name          | Pattern   |
+---------------+-----------+
| Duck          | Seasonal  |
| Mac           | Bi_annual |
| Duckula       | Random    |
| iPhone        | Bi_annual |
| HTML          | Seasonal  |
| SQL           | Random    |
| Sherlock_Duck | Random    |
| XML           | Seasonal  |
| Database      | Bi_annual |
+---------------+-----------+
9 rows in set (0.00 sec)

mysql>
mysql> drop table duck_sales;
Query OK, 0 rows affected (0.00 sec)








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