SQL - クエリ入門(where節、having節)

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3章(クエリ入門),　3.8(練習問題)3-2を解いてみる。

3-2.

SQL文(TextWrangler)

select account_id, cust_id, avail_balance
from account
where status = 'ACTIVE'
having avail_balance > 2500;

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 2
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> show tables;
+----------------+
| Tables_in_bank |
+----------------+
| account        |
| branch         |
| business       |
| customer       |
| department     |
| employee       |
| individual     |
| officer        |
| product        |
| product_type   |
| tmp            |
| transaction    |
+----------------+
12 rows in set (0.03 sec)

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 (0.03 sec)

mysql> select account_id, cust_id, avail_balance
    -> from account
    -> where status = 'ACTIVE'
    -> having avail_balance > 2500;
+------------+---------+---------------+
| account_id | cust_id | avail_balance |
+------------+---------+---------------+
|          3 |       1 |       3000.00 |
|         12 |       4 |       5487.09 |
|         15 |       6 |      10000.00 |
|         17 |       7 |       5000.00 |
|         18 |       8 |       3487.19 |
|         22 |       9 |       9345.55 |
|         24 |      10 |      23575.12 |
|         27 |      11 |       9345.55 |
|         28 |      12 |      38552.05 |
|         29 |      13 |      50000.00 |
+------------+---------+---------------+
10 rows in set (0.05 sec)

mysql> quit;
Bye
$