Question

我不是SQL专家。我需要优化以下查询：

SELECT trn.runner_id,
  tr.race_id,
  trr.position,
  trr.program_number,
  trn.horse_name,
  trc.track_id,
  tr.race_number,
  trc.ticket_name,
  trc.race_card_id,
  trn.couple_type,
  tt.country,
  tr.post_time,
  tr.sp_fav
FROM tb_race_results trr,
  tb_races tr,
  tb_race_runners trn,
  tb_race_card trc,
  tb_tracks tt
WHERE trr.race_id=514729
      AND tr.race_id=trr.race_id
      AND tr.race_card_id=trc.race_card_id
      AND trr.program_number=trn.program_number
      AND trn.race_id=trr.race_id
      AND tt.track_id=trc.track_id
ORDER BY trr.position

我已经添加了必需的索引，但查询执行得很糟糕（约1秒）。

Answer 1

＆＃13;

   SELECT trn.runner_id,
  tr.race_id,
  trr.position,
  trr.program_number,
  trn.horse_name,
  trc.track_id,
  tr.race_number,
  trc.ticket_name,
  trc.race_card_id,
  trn.couple_type,
  tt.country,
  tr.post_time,
  tr.sp_fav
FROM tb_race_results trr
INNER JOIN   tb_races tr ON  tr.race_id=trr.race_id
INNER JOIN  tb_race_runners trn On trn.race_id=trr.race_id  On  trr.program_number=trn.program_number 
INNER JOIN  tb_race_card trc    On tr.race_card_id=trc.race_card_id
INNER JOIN  tb_tracks tt        On tt.track_id=trc.track_id 

WHERE trr.race_id=514729

＆＃13;

SQL查询优化 - 添加连接等

1 个答案: