SELECT 基本 where句を設定する 比較 $rs->search({ age => 20 }) # WHERE age = 20 = $rs->search({ age => {'!=', 20} }) # WHERE age != 20 != $rs->search({ age => {'>' => 20} }) # WHERE age > 20 > $rs->search({ age => undef }) # WHERE age is NULL NULL 論理演算子 $rs->search([{ age => 20 },{ age => 30 }]) # WHERE age = 20 OR age = 30 OR $rs->search({ age => 20, name => 'taro }) # WHERE age = 20 AND name = 'taro' AND $