MySQL的加入与总

Question

我有一个叫这种结构导致表：

resultid，冠军，类型

而与此结构的表称为门票：

resultid，ticketid，赌，sum_won ，状态

而且我想告诉从表中结果每行和每一个结果，我想totalBet和Sum_won使用从表票值来计算

我试图做一些连接，一些总和，但我不能得到我想要的。

SELECT *,COALESCE(SUM(tickets.bet),0) AS totalbets, 
     COALESCE(SUM(tickets.sum_won),0) AS totalwins 
FROM `results` NATURAL JOIN `tickets` 
WHERE tickets.status<>0 
GROUP BY resultid 

请给我一些建议。

我想这样

RESULT WINNER TOTALBETS TOTALWINS 
1  2  431  222 
2  3   0   0 
3  1   23  0 
4  1   324  111 

Answer 1

使用显示的东西：

SELECT r.*, 
      COALESCE(x.totalbet, 0) AS totalbet, 
      COALESCE(x.totalwins, 0) AS totalwins 
    FROM RESULTS r 
LEFT JOIN (SELECT t.resultid, 
        SUM(t.bet) AS totalbet, 
        SUM(t.sum_won) AS totalwins 
      FROM TICKETS t 
      WHERE t.status != 0 
     GROUP BY t.resultid) x ON x.resultid = r.resultid 

我不关心自然连接语法，宁愿要明确了解如何加入/链接表一起。

Answer 2

SELECT *, COALESCE(SUM(tickets.bet),0) AS totalbets, 
     COALESCE(SUM(tickets.sum_won),0) AS totalwins 
FROM `results` NATURAL JOIN `tickets` 
WHERE tickets.status<>0 
GROUP BY resultid 

尝试与resultid替换第一个*。如果这有帮助，则将更多列添加到SELECT，并将它们同时添加到GROUP BY。