Question

我有以下4个表：

Participant      {id_participant, etc.}

Player           {id_participant, name, phone, etc.}

Team             {id_participant, name, phone, etc..}

Couple           {id_participant, id_player1, id_player2}

Games            {id_game, localization, etc.}

GamesParticipant { id_game, id_participant, type (p,t,c) }

在我的网站上，我需要进行许多涉及参与者的查询，而正常方式需要每个查询进行多次连接。我认为第一个解决方案是使用Player，Team，Couple的联合创建一个View，并对该视图进行查询，但阅读帖子MySQL view performance我不能使用union。

执行此操作的最佳方法是什么，是否可以使用存储过程？

感谢

Answer 1

   SELECT *
     FROM Participant
LEFT JOIN Player
       ON Player.id_participant = Participant.id_participant
LEFT JOIN Team
       ON Team.id_participant = Participant.id_participant
LEFT JOIN Couple
       ON Couple.id_participant = Participant.id_participant
LEFT JOIN GamesParticipant
       ON GamesParticipant.id_participant = Participant.id_participant
LEFT JOIN Games
       ON Games.id_game= GamesParticipant.id_game

具有许多连接的mysql重复查询

1 个答案: