SQL - 集合(union演算子)

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6章(集合),　6.5(練習問題)6-2を解いてみる。

6-2.

SQL文(TextWrangler)

select fname, lname from individual
union
select fname, lname from employee;

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 18
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 (0.00 sec)

mysql> desc individual
    -> ;
+------------+------------------+------+-----+---------+-------+
| Field      | Type             | Null | Key | Default | Extra |
+------------+------------------+------+-----+---------+-------+
| cust_id    | int(10) unsigned | NO   | PRI | NULL    |       |
| fname      | varchar(30)      | NO   |     | NULL    |       |
| lname      | varchar(30)      | NO   |     | NULL    |       |
| birth_date | date             | YES  |     | NULL    |       |
+------------+------------------+------+-----+---------+-------+
4 rows in set (0.01 sec)

mysql> desc employee;
+--------------------+----------------------+------+-----+---------+----------------+
| Field              | Type                 | Null | Key | Default | Extra          |
+--------------------+----------------------+------+-----+---------+----------------+
| emp_id             | smallint(5) unsigned | NO   | PRI | NULL    | auto_increment |
| fname              | varchar(20)          | NO   |     | NULL    |                |
| lname              | varchar(20)          | NO   |     | NULL    |                |
| start_date         | date                 | NO   |     | NULL    |                |
| end_date           | date                 | YES  |     | NULL    |                |
| superior_emp_id    | smallint(5) unsigned | YES  | MUL | NULL    |                |
| dept_id            | smallint(5) unsigned | YES  | MUL | NULL    |                |
| title              | varchar(20)          | YES  |     | NULL    |                |
| assigned_branch_id | smallint(5) unsigned | YES  | MUL | NULL    |                |
+--------------------+----------------------+------+-----+---------+----------------+
9 rows in set (0.04 sec)

mysql> select fname, lname from individual
    -> union
    -> select fname, lname from employee;
+----------+-----------+
| fname    | lname     |
+----------+-----------+
| James    | Hadley    |
| Susan    | Tingley   |
| Frank    | Tucker    |
| John     | Hayward   |
| Charles  | Frasier   |
| John     | Spencer   |
| Margaret | Young     |
| Louis    | Blake     |
| Richard  | Farley    |
| Michael  | Smith     |
| Susan    | Barker    |
| Robert   | Tyler     |
| Susan    | Hawthorne |
| John     | Gooding   |
| Helen    | Fleming   |
| Chris    | Tucker    |
| Sarah    | Parker    |
| Jane     | Grossman  |
| Paula    | Roberts   |
| Thomas   | Ziegler   |
| Samantha | Jameson   |
| John     | Blake     |
| Cindy    | Mason     |
| Frank    | Portman   |
| Theresa  | Markham   |
| Beth     | Fowler    |
| Rick     | Tulman    |
+----------+-----------+
27 rows in set (0.01 sec)

mysql> quit;
Bye
$