字段列表中的未知列event_id

Question

您好，我正在学习MYSQL，却收到错误消息

字段列表中的未知列event_id

但是我在两个表中都有此列

SELECT 
event_id.events,
tournament.events, 
team1.events,
team2.events,event_date.events,
venue.events, picks.pick,tournament.picks
FROM  events 
INNER JOIN picks 
ON  `event_id`.events = `event_id`.picks
 WHERE tournament = 'SUPER15'

我已经检查，调整和尝试过，但是我无法弄清楚出什么问题了...

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Answer 1

首先应该是表名或别名，而不是列名，如下所示

 SELECT
    events.event_id,
    events.tournament, 
    events.team1, 
    events.team2,
    events.event_date,
    events.venue, 
    picks.pick,
    picks.tournament
FROM  events 
    INNER JOIN picks ON  
           events.`event_id` = picks.`event_id`
    WHERE 
        events.tournament = 'SUPER15'

您还必须为条件WHERE tournament = 'SUPER15'添加列名。 我将其更改为WHERE events.tournament = 'SUPER15' 。 我还建议您使用以下别名

  SELECT 
       E.event_id,
       E.tournament, 
       E.team1, 
       E.team2,
       E.event_date,
       E.venue, 
       P.pick,
       P.tournament
 FROM  events E
    INNER JOIN picks P ON  
              E.`event_id` = P.`event_id`
    WHERE 
        E.tournament = 'SUPER15'

它更具可读性，不是吗？

Answer 2

您要以相反的顺序指定选择。 应该是table.column ：

SELECT events.event_id,events.tournament, events.team, events.team2,
       events.event_date, events.venue, pick.picks,picks.tournament
FROM  events 
INNER JOIN picks ON  `event_id`.events = `event_id`.picks
WHERE tournament = 'SUPER15'