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ランダムなレコードを取得する

SQLiteにおいてランダムにレコードを取得する方法は

SELECT * FROM entry ORDER BY RANDOM();

この関数はDBMSによって変わるので適宜変更が必要。
一般的な所ではPostgresではRANDOM()、MySQLではRAND()となっている。

それでRails上からは

@entries = Entry.all :order => "RANDOM()"

となる。
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