Entries from 2007-10-11 to 1 day
MySQL 5.0.45 でテスト。 delete from t where not exists (seect * from ...); delete from t where exists (seect * from ...); delete from t where c in (select ...);どっちもテーブル t をシーケンシャルアクセスするらしい。まじですか。 それとも、…
MySQL 5.0.45 でテスト。 delete from t where not exists (seect * from ...); delete from t where exists (seect * from ...); delete from t where c in (select ...);どっちもテーブル t をシーケンシャルアクセスするらしい。まじですか。 それとも、…
