SQL - フィルタリング(範囲条件、等価条件)

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、ISBN4-87311-281-8) の4章(フィルタリング),　4.5(練習問題)4-1を解いてみる。

4-1.

返されるトランザクションIDは、1,2,3,5,6,7。

データテーブルを作成、確認

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 141
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   |
| transaction    |
+----------------+
11 rows in set (0.00 sec)

mysql> create table tmp(
    -> txn_id int,
    -> txn_date date,
    -> account_id int,
    -> txn_type_cd enum("CDT","DBT"),
    -> amount float);
Query OK, 0 rows affected (0.08 sec)

mysql> desc tmp;
+-------------+-------------------+------+-----+---------+-------+
| Field       | Type              | Null | Key | Default | Extra |
+-------------+-------------------+------+-----+---------+-------+
| txn_id      | int(11)           | YES  |     | NULL    |       |
| txn_date    | date              | YES  |     | NULL    |       |
| account_id  | int(11)           | YES  |     | NULL    |       |
| txn_type_cd | enum('CDT','DBT') | YES  |     | NULL    |       |
| amount      | float             | YES  |     | NULL    |       |
+-------------+-------------------+------+-----+---------+-------+
5 rows in set (0.01 sec)

mysql> insert into tmp
    -> values(1,'2005-02-22',101,'CDT',1000.00);
Query OK, 1 row affected (0.00 sec)

mysql> select * from tmp;
+--------+------------+------------+-------------+--------+
| txn_id | txn_date   | account_id | txn_type_cd | amount |
+--------+------------+------------+-------------+--------+
|      1 | 2005-02-22 |        101 | CDT         |   1000 |
+--------+------------+------------+-------------+--------+
1 row in set (0.00 sec)

mysql> insert into tmp
    -> values(2,'2005-02-23',102,'CDT',525.75);
Query OK, 1 row affected (0.00 sec)

mysql> insert into tmp
    -> values(3,'2005-02-24',101,'DBT',100.00);
Query OK, 1 row affected (0.00 sec)

mysql> insert into tmp
    -> values(4,'2005-02-24',103,'CDT',55);
Query OK, 1 row affected (0.01 sec)

mysql> insert into tmp
    -> values(5,'2005-02-25',101,'DBT',50);
Query OK, 1 row affected (0.01 sec)

mysql> insert into tmp
    -> values(6,'2005-02-25',103,'DBT',25);
Query OK, 1 row affected (0.00 sec)

mysql> insert into tmp
    -> values(7,'2005-02-25',102,'CDT',125.37);
Query OK, 1 row affected (0.00 sec)

mysql> insert into tmp
    -> values(8,'2005-02-26',103,'DBT',10);
Query OK, 1 row affected (0.01 sec)

mysql> insert into tmp
    -> values(9,'2005-02-27',101,'CDT',75);
Query OK, 1 row affected (0.00 sec)

mysql> select * from tmp;
+--------+------------+------------+-------------+--------+
| txn_id | txn_date   | account_id | txn_type_cd | amount |
+--------+------------+------------+-------------+--------+
|      1 | 2005-02-22 |        101 | CDT         |   1000 |
|      2 | 2005-02-23 |        102 | CDT         | 525.75 |
|      3 | 2005-02-24 |        101 | DBT         |    100 |
|      4 | 2005-02-24 |        103 | CDT         |     55 |
|      5 | 2005-02-25 |        101 | DBT         |     50 |
|      6 | 2005-02-25 |        103 | DBT         |     25 |
|      7 | 2005-02-25 |        102 | CDT         | 125.37 |
|      8 | 2005-02-26 |        103 | DBT         |     10 |
|      9 | 2005-02-27 |        101 | CDT         |     75 |
+--------+------------+------------+-------------+--------+
9 rows in set (0.00 sec)

mysql> select txn_id
    -> from tmp
    -> where txn_date < '2005-02-26'
    -> and (txn_type_cd = 'DBT' or amount > 100);
+--------+
| txn_id |
+--------+
|      1 |
|      2 |
|      3 |
|      5 |
|      6 |
|      7 |
+--------+
6 rows in set (0.00 sec)

mysql> quit;
Bye
$