Get the number of items for each type of wood

       
mysql> CREATE TABLE IF NOT EXISTS cabinets
    -> (
    ->   id             INT     AUTO_INCREMENT  PRIMARY KEY,
    ->   wood           CHAR(10)        NOT NULL,
    ->   item           CHAR(20)        NOT NULL
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO cabinets (wood, item)   VALUES ("Pine", "Bookcase");
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO cabinets (wood, item)   VALUES ("Beech", "Bookcase");
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO cabinets (wood, item)   VALUES ("Oak", "Bookcase");
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO cabinets (wood, item)   VALUES ("Pine", "Display Case");
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO cabinets (wood, item)   VALUES ("Oak", "Display Case");
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT * FROM cabinets;
+----+-------+--------------+
| id | wood  | item         |
+----+-------+--------------+
|  1 | Pine  | Bookcase     |
|  2 | Beech | Bookcase     |
|  3 | Oak   | Bookcase     |
|  4 | Pine  | Display Case |
|  5 | Oak   | Display Case |
+----+-------+--------------+
5 rows in set (0.00 sec)

mysql>
mysql>
mysql> SELECT wood, COUNT(*) AS  num_items
    -> FROM cabinets
    -> GROUP BY wood;
+-------+-----------+
| wood  | num_items |
+-------+-----------+
| Beech |         1 |
| Oak   |         2 |
| Pine  |         2 |
+-------+-----------+
3 rows in set (0.00 sec)

mysql>
mysql>
mysql> # delete this sample table
mysql> DROP TABLE IF EXISTS cabinets;
Query OK, 0 rows affected (0.00 sec)

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Get the number of items for each type of wood : COUNT « Aggregate Functions « SQL / MySQL

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