- http://www.databasejournal.com/features/mysql/
- http://sol.gfxile.net/galaxql.html
- http://www.edventis.com
- http://sqlzoo.net/wiki/Main_Page
- http://cspractical.org/MySQL/SQL-Intro/tutorial
- http://beginner-sql-tutorial.com/sql.htm
- http://www.sql-tutorial.ru/
- http://www.sql-ex.ru
- http://www.tutorialspoint.com/sql/
- http://www.dreamincode.net/forums/blog/48/entry-4251-my-free-ebook-a-primer-on-sql/
- http://www.sqlskills.com/blogs/paul/
- http://blog.sqlauthority.com/
- http://www.mysqltutorial.org/
- http://www.artfulsoftware.com/infotree/queries.php
- http://www.w3resource.com/mysql/advance-query-in-mysql/find-duplicate-data-mysql.php
- http://www.techotopia.com/index.php/Advanced_MySQL_Data_Filtering_-_AND,_OR,_NOT_and_IN
- http://www.tuxradar.com/practicalphp/9/3/13#null
- http://www.brainbell.com/tutorials/MySQL/Combining_WHERE_Clauses.htm
- http://stackoverflow.com/questions/17318429/how-to-select-a-maximum-value-row-in-mysql-table
- http://www.psce.com/blog/2012/05/15/mysql-mistakes-do-you-use-group-by-correctly/
- http://www.edventis.com/video/Video-MySQL-Database-Tutorial-1-Introduction-to-Databases.html
- http://www.java2s.com/Tutorial/MySQL/CatalogMySQL.htm
- http://www.sitepoint.com/how-to-create-mysql-triggers/
- http://www.sitepoint.com/how-to-create-mysql-events/
- http://sqlfiddle.com/#!2/dc06f/1
http://sqlfiddle.com/#!2/dc06f/88
http://stackoverflow.com/a/19672038 - http://jsfiddle.net/kpu6mybb/
- http://pastebin.com/1REtKH7b
- http://www.proweb.co.id/articles/web_based_accounting/merancang_tabel_untuk_coa.html
- http://www.kembar.pro/2014/10/klasifikasi-sistem-kode-akun-akuntansi.html