在SQL中限制返回的數據

Question

我發佈了下面的問題並得到了一些回覆。

How to display rows that when added together equal zero

是來到最接近回答我的問題的回答是這樣的：

SELECT t1.* 
FROM transactions AS t1 
INNER JOIN 
(
    SELECT 
    tbis.client_ref , 
    tbis.supplier_key, 
    sum(tbis.client_amount) AS total 
    FROM transactions tbis 
    WHERE tbis.client_amount !=0 
    GROUP BY tbis.client_ref, tbis.supplier_key 
    HAVING sum(tbis.client_amount) =0 
) AS t2 ON t1.client_ref = t2.client_ref 
     AND t1.supplier_key = t2.supplier_key 
ORDER BY t2.total; 

我遇到的問題是，它包括結果中的行，其中客戶端數量= 0我基本上只需要在客戶金額不爲0的行上執行以下操作。

任何想法？

非常感謝

Answer 1

它看起來像發生此問題，因爲無論有關於您的交易表上沒有主鍵（在你的其他職位暗示），或者你不加入就可以了。這意味着只要至少有一個client_ref和supplier_key對具有非零值，則將返回所有值。 無論是WHERE添加到外部查詢

SELECT t1.* 
FROM transactions AS t1 
INNER JOIN 
(
    SELECT 
    tbis.client_ref , 
    tbis.supplier_key, 
    sum(tbis.client_amount) AS total 
    FROM transactions tbis 
    WHERE tbis.client_amount !=0 
    GROUP BY tbis.client_ref, tbis.supplier_key 
    HAVING sum(tbis.client_amount) =0 
) AS t2 ON t1.client_ref = t2.client_ref 
     AND t1.supplier_key = t2.supplier_key 
WHERE t1.client_amount !=0 

ORDER BY t2.total; 

或者也加入對client_amount

SELECT t1.* 
FROM transactions AS t1 
INNER JOIN 
(
    SELECT 
    tbis.client_ref , 
    tbis.supplier_key, 
    sum(tbis.client_amount) AS total 
    FROM transactions tbis 
    WHERE tbis.client_amount !=0 
    GROUP BY tbis.client_ref, tbis.supplier_key 
    HAVING sum(tbis.client_amount) =0 
) AS t2 ON t1.client_ref = t2.client_ref 
     AND t1.supplier_key = t2.supplier_key 
     AND t1.client_amount = t2.client_amount 

ORDER BY t2.total;