php - 对值相同的 2 列求和

Question

我将从表格开始: 查询:

SELECT taw.user_id AS taw_user_id, COALESCE(SUM(tai.bid), 0) AS tai_bid, taw.win AS taw_win
FROM tb_auction_winners taw JOIN
     tb_aukciono_istorija tai
     ON taw.id = tai.aukciono_id
WHERE tai.user_id = 206 AND taw.user_id = 206
GROUP BY aukciono_id, taw.user_id;

我的问题是我无法获得我想要的结果(使用 inspect element 更改):

它应该对所有 taw_bid 和 taw_win 值求和，其中 taw_user_id 相同。我读过SQL query to sum the data和 How to take sum of column with same id in SQL?线程，但它没有帮助。使用 GROUP BY aukciono_id, taw_user_id 一切都应该没问题，但它不起作用。我想这是一个非常简单的修复，但我找不到问题所在:(请帮助我。

SQL FIDDLE:http://sqlfiddle.com/#!9/6945a/1

Answer 1

如果我做对了:您只想按 taw_user_id 求和 - 所以那是 GROUP BY 子句中的唯一列

  SELECT taw.user_id AS taw_user_id
      ,SUM(taw.win) AS taw_win
      ,SUM(tai.bid) AS tai_bid
  FROM tb_auction_winners taw
  INNER JOIN  
  ( SELECT aukciono_id, user_id, SUM(bid) as bid
      FROM tb_aukciono_istorija
      group by aukciono_id, user_id
   )  tai
  ON taw.id = tai.aukciono_id
  AND taw.user_id  = tai.user_id
 WHERE taw.user_id = 206 
 GROUP BY taw.user_id