https://tbd.kaitoy.xyz/2015/09/13/orm-is-offensive-anti-pattern/
http://www.slideshare.net/t_wada/sql-antipatterns-digest
http://qiita.com/iwata@github/items/9a47ddababd8e0a82662
SQLアンチパターン 幻の第26章「とりあえず削除フラグ」
http://www.slideshare.net/t_wada/ronsakucasual