SQL - フィルタリング(ワイルドカード(_, %)とlike)

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4章(フィルタリング),　4.5(練習問題)4-4を解いてみる。

4-4.

SQL文(TextWrangler)

select * from individual
where lname like "_a%e%";

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 12
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 (0.01 sec)

mysql> desc customer;
+--------------+------------------+------+-----+---------+----------------+
| Field        | Type             | Null | Key | Default | Extra          |
+--------------+------------------+------+-----+---------+----------------+
| cust_id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| fed_id       | varchar(12)      | NO   |     | NULL    |                |
| cust_type_cd | enum('I','B')    | NO   |     | NULL    |                |
| address      | varchar(30)      | YES  |     | NULL    |                |
| city         | varchar(20)      | YES  |     | NULL    |                |
| state        | varchar(20)      | YES  |     | NULL    |                |
| postal_code  | varchar(10)      | YES  |     | NULL    |                |
+--------------+------------------+------+-----+---------+----------------+
7 rows in set (0.05 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 (0.05 sec)

mysql> select lname from individual;
+---------+
| lname   |
+---------+
| Hadley  |
| Tingley |
| Tucker  |
| Hayward |
| Frasier |
| Spencer |
| Young   |
| Blake   |
| Farley  |
+---------+
9 rows in set (0.00 sec)

mysql> select * from individual
    -> where lname like "_a%e%";
+---------+---------+--------+------------+
| cust_id | fname   | lname  | birth_date |
+---------+---------+--------+------------+
|       1 | James   | Hadley | 1972-04-22 |
|       9 | Richard | Farley | 1968-06-16 |
+---------+---------+--------+------------+
2 rows in set (0.00 sec)

mysql> quit;
Bye
$