2015-04-21から1日間の記事一覧

nil and null

http://stackoverflow.com/a/5909310

unrecognized selector sent to instance

method missing on the instance http://ye-system-engineer.blogspot.jp/2010/08/iphoneunrecognized-selector-sent-to.html?m=1

OLTP and OLAP

DB

http://stackoverflow.com/questions/21900185/what-are-oltp-and-olap-what-is-the-difference-between-them (以前も書いた気が)