如果Sum（）函數有一行，查詢不會顯示結果

Question

我正在嘗試創建Office Access程序來監視我的部門。

我有一張表，其中包含我欠某人名爲tbl_depts的多少錢。

我有另一張表，其中包含名爲tbl_payments的付款。

這裏是我的語法：

SELECT DISTINCTROW 
    tbl_depts.who, 
    tbl_depts.dept, 
    Sum(tbl_payments.payment) AS [Paid], 
    (tbl_depts.dept - [Paid]) AS remaining 
FROM tbl_depts INNER JOIN tbl_payments ON tbl_depts.[ID] = tbl_payments.[dept_ID] 
GROUP BY tbl_depts.who; 

但是有一個問題。如果部門只有一筆付款，則查詢顯示爲空。但是如果該部門有兩筆付款，這個查詢就完美了。

我該怎麼辦？

Answer 1

怎麼樣使用使用左側INNER JOIN確保DEPT_ID兩個表時存在JOIN。

SELECT DISTINCTROW 
    tbl_depts.who, 
    tbl_depts.dept, 
    Sum(tbl_payments.payment) AS [Paid], 
    (tbl_depts.dept - [Paid]) AS remaining 
FROM tbl_depts LEFT JOIN tbl_payments 
    ON tbl_depts.[ID] = tbl_payments.[dept_ID] 
GROUP BY tbl_depts.who, tbl_depts.dept, (tbl_depts.dept - [Paid]); 

Answer 2

您的查詢上面不會運行 - 分組是錯誤的。 這工作：

SELECT tbl_depts.ID, tbl_depts.who, tbl_depts.dept, Sum(tbl_payments.payment) AS paid, [dept]-[payment] AS remaining 
FROM tbl_payments INNER JOIN tbl_depts ON tbl_payments.dept_ID = tbl_depts.ID 
GROUP BY tbl_depts.ID, tbl_depts.who, tbl_depts.dept, [dept]-[payment];