SQL - グループ化と集約化(降順ソート(ORDER BY, DESC))

初めてのSQL
Alan Beaulieu (著)

開発環境

• OS: OS X Lion - Apple
• データベース言語: SQL
• リレーショナルデータベース: MySQL

『初めてのSQL』(Alan Beaulieu 著、株式会社クイープ 翻訳、オライリー・ジャパン、2006年、ISBN4-8733-181-8) の8章(グループ化と集約化),　8.5(練習問題)8-4を解いてみる。

8-4.

SQL文(TextWrangler)

SELECT product_cd, open_branch_id, SUM(avail_balance)
FROM account
GROUP BY product_cd, open_branch_id
HAVING COUNT(*) >= 2
ORDER BY SUM(avail_balance) DESC;

入出力結果(Terminal)

$ mysql -u lrngsql -p bank
Enter password: 
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.5.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> desc account;
+--------------------+----------------------------------+------+-----+---------+----------------+
| Field              | Type                             | Null | Key | Default | Extra          |
+--------------------+----------------------------------+------+-----+---------+----------------+
| account_id         | int(10) unsigned                 | NO   | PRI | NULL    | auto_increment |
| product_cd         | varchar(10)                      | NO   | MUL | NULL    |                |
| cust_id            | int(10) unsigned                 | NO   | MUL | NULL    |                |
| open_date          | date                             | NO   |     | NULL    |                |
| close_date         | date                             | YES  |     | NULL    |                |
| last_activity_date | date                             | YES  |     | NULL    |                |
| status             | enum('ACTIVE','CLOSED','FROZEN') | YES  |     | NULL    |                |
| open_branch_id     | smallint(5) unsigned             | YES  | MUL | NULL    |                |
| open_emp_id        | smallint(5) unsigned             | YES  | MUL | NULL    |                |
| avail_balance      | float(10,2)                      | YES  |     | NULL    |                |
| pending_balance    | float(10,2)                      | YES  |     | NULL    |                |
+--------------------+----------------------------------+------+-----+---------+----------------+
11 rows in set (0.00 sec)

mysql> SELECT product_cd, open_branch_id, SUM(avail_balance)
    -> FROM account
    -> GROUP BY product_cd, open_branch_id
    -> HAVING COUNT(*) >= 2
    -> ORDER BY SUM(avail_balance) DESC;
+------------+----------------+--------------------+
| product_cd | open_branch_id | SUM(avail_balance) |
+------------+----------------+--------------------+
| CHK        |              4 |           67852.33 |
| MM         |              1 |           14832.64 |
| CD         |              1 |           11500.00 |
| CD         |              2 |            8000.00 |
| CHK        |              2 |            3315.77 |
| CHK        |              1 |             782.16 |
| SAV        |              2 |             700.00 |
+------------+----------------+--------------------+
7 rows in set (0.00 sec)

mysql> quit
Bye
$