Question

错误1054（42S22）：'where子句'中的未知列'm.match_id'

(select m.match_id,m.team1,m.team2,m.team1_score from match_results as m where m.team1_score=( select max(score) from ( select p.team1_score as score from match_results p where p.match_id=m.match_id UNION select q.team2_score as score from match_results q where q.match_id=m.match_id ) as T )) UNION (select m1.match_id,m1.team1,m1.team2,m1.team2_score from match_results m1 where m1.team2_score=( select max(score) from ( select team1_score as score from match_results where match_id=m1.match_id UNION select team2_score as score from match_results where match_id=m1.match_id )as T ));

架构：match_results（match_id，team1，team2，team1_score，team2_score） team1和team2是varchar（） team1_score和team2_score是整数。我正在尝试以最高分（team1_score或team2_score）获取团队（team1或team2））

Answer 1

我简化了您的查询

select m.team1,m.team2,m.team1_score 
   from match_results as m,
        match_results as p
  where m.team1_score= greatest (p.team1_score, p.team2_score)
    AND m.match_id = p.match_id

UNION

select m.team1,m.team2,m.team2_score 
   from match_results as m,
        match_results as p
  where m.team2_score= greatest (p.team1_score, p.team2_score)
    AND m.match_id = p.match_id

你会不会重复同一次match_id？（逻辑上没有！）如果是这样，请使用上面的查询，否则你甚至可以使用简单的

如果team1的分数最高，此查询将给出team1的分数。如果team2得分高于team1

，它将给予team2的分数

 select m.team1, m.team2, greatest (m.team1_score, m.team2_score)
       from match_results as m

Answer 2

ERROR 1054（42S22）

此错误表示您的某个字段名称错误你要别名它并使用错误的别名，或者只是错误的字段名称另外，为什么查询中有两个AS t？

这个SQL查询出了什么问题？ERROR 1054（42S22）

2 个答案: