子查詢以獲取到期付款

我有兩個表，一個存儲用戶收入，另一個存儲用戶付款。我想要做的是根據50美元的最低限額並僅從最後一次付款中獲得到期的付款。子查詢以獲取到期付款

表（userEarnings）具有以下列

id ->autoincrement 
userid -> unique id for users 
earn ->the amount of money the user earn (25.00, 14.50..) 
date_added -> DATETIME column

每個用戶得到支付

pid->autoincrement 
uid ->unique user id, this is the same as userid from the above table 
paid_amt->payments the user received(500.00, 100.00...) 
paid_date ->the date the user was paid(DATETIME)

來自這兩個表的時間第二個表（userPayment）專賣店，我想列出用戶名和自上次付款以來欠款總和大於50美元的總和。我假設我需要使用子查詢和組，但不知道從哪裏開始。

任何幫助將不勝感激。由於

來源

2009-12-12 jeff

稍微不同的方式，使用not exists子查詢。取決於口味，可以表現不同，並且可以更易於閱讀。

SELECT ue.userid User 
,   SUM(ue.earn) AmountDue 
FROM  userEarnings ue 
WHERE  NOT EXISTS (
      SELECT * 
      FROM userPayment up 
      WHERE up.uid = ue.userid 
      AND up.paid_date >= ue.date_added 
     ) 
GROUP BY ue.userid 
HAVING AmountDue > 50.0

來源

2009-12-13 00:18:18 Andomar

試試這個：

SELECT userEarnings.userid, SUM(earn) AS total_earn FROM (
    SELECT uid, MAX(paid_date) AS paid_date 
    FROM userPayment 
    GROUP BY uid) AS T1 
RIGHT JOIN userEarnings ON T1.uid = userEarnings.userid 
WHERE date_added > T1.paid_date OR T1.paid_date IS NULL 
GROUP BY userEarnings.userid 
HAVING total_earn > 50

來源

2009-12-12 23:54:33

不應該是'有和（賺）> 50'嗎？ – 2009-12-12 23:58:56

看起來像SergeyKazachenko是正確的，並且'inner join'過濾了之前從未付款的用戶 – Andomar 2009-12-13 00:20:10

修復了連接到外連接的問題。而且我認爲無論您使用SUM（獲得）還是別名，HAVING都不重要。他們都工作。 – 2009-12-13 00:31:03

SELECT userEarnings.userid, SUM(userEarnings.earn) AS earn 
FROM userEarnings 
LEFT OUTER JOIN (
    SELECT uid, MAX(paid_date) AS last_payment 
    FROM userPayment 
    GROUP BY uid) AS q 
ON q.uid = userEarnings.userid 
--the q.last_payment IS NULL clause ensures that the user who never got a payment before will get his first $50 check 
WHERE (userEarnings.date_added > q.last_payment) OR (q.last_payment IS NULL) 
GROUP BY userEarnings.userid 
HAVING SUM(userEarnings.earn) >= 50.0

來源

2009-12-13 00:08:55 SergeyKazachenko

+1我認爲這可行 – Andomar 2009-12-13 00:18:59

子查詢以獲取到期付款

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