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10章(結合), 10.4(練習問題)10-1を解いてみる。
10-1.
SQL文(TextWrangler)
select p.name, a.account_id from product p left outer join account a on p.product_cd = a.product_cd;
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 1 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 (0.09 sec) mysql> desc product; +-----------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-------------+------+-----+---------+-------+ | product_cd | varchar(10) | NO | PRI | NULL | | | name | varchar(50) | NO | | NULL | | | product_type_cd | varchar(10) | NO | MUL | NULL | | | date_offered | date | YES | | NULL | | | date_retired | date | YES | | NULL | | +-----------------+-------------+------+-----+---------+-------+ 5 rows in set (0.01 sec) mysql> select p.name, a.account_id -> from product p left outer join account a -> on p.product_cd = a.product_cd; +-------------------------+------------+ | name | account_id | +-------------------------+------------+ | auto loan | NULL | | business line of credit | 25 | | business line of credit | 27 | | certificate of deposit | 3 | | certificate of deposit | 15 | | certificate of deposit | 17 | | certificate of deposit | 23 | | checking account | 1 | | checking account | 4 | | checking account | 7 | | checking account | 10 | | checking account | 13 | | checking account | 14 | | checking account | 18 | | checking account | 21 | | checking account | 24 | | checking account | 28 | | money market account | 8 | | money market account | 12 | | money market account | 22 | | home mortgage | NULL | | savings account | 2 | | savings account | 5 | | savings account | 11 | | savings account | 19 | | small business loan | 29 | +-------------------------+------------+ 26 rows in set (0.09 sec) mysql> quit Bye $
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