Backup of SQL (No. 2)

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  • 1 (2014-05-16 (Fri) 19:45:44)
  • 2 (2015-04-16 (Thu) 11:24:17)
  • 3 (2016-11-12 (Sat) 16:03:06)

DISTINCT [distinct]

• 重複行を除外
  • http://www.dbonline.jp/mysql/select/index13.html

SELECT FOR UPDATE

• SELECT ... FOR UPDATEとロックの挙動
  • http://walf443.hatenablog.com/entry/20130829/1377788440