Question

我正在尝试做类似的事情，但我不确定你是否可以通过内部联接做到这一点：

SELECT "scores".* 
FROM "scores" 
    INNER JOIN "games" ON "games"."id" = "scores"."games_id" 
WHERE 
    "games"."date" >= '2013-02-11 19:30:11.799227' 
AND "scores".value > 350;

感谢您的帮助。此外，如果您知道如何编写ActiveRecord / arel语句，那么也会提供有用的查询。

我的模特看起来像这样：

class Score < ActiveRecord::Base
  belongs_to :game
  delegates :date, to: game
end

class Game < ActiveRecord::Base
  has_many :scores, dependent: :destroy
end

Answer 1

ActiveRecord查询如下所示：

some_date = DateTime.parse('2013-02-11 19:30:11.799227')
score = 350
Score.joins(:game).
      where("games.date >= ? AND scores.value > ?", some_date, score)

这假设您的分数模型中有belongs_to :game。

SQL内部JOIN与查询

1 个答案: