SQL，發票聲明，當前和過去的會費

Question

SQL新手，瞭解基本查詢，試圖寫出比我的知識稍高一些的東西，並且如果有人能夠提供它，需要一些幫助。我已經嘗試過使用模板代碼並根據我的需要進行剪裁，但沒有成功。

我正在處理1個表格，並嘗試獲取查詢以顯示客戶當前的0-30天餘額以及30-60,60-90,90-120,120天以上的任何過期日期。

table: c_inv_h 
columns: comp_code, cust_code, inv_num, inv_date, inv_tp, inv_amt, inv_tax1, inv_tax2 

例如數據

comp_code, cust_code, inv_num, inv_date, inv_tp, inv_amt, inv_tax1, inv_tax2 
M1, 100068, 1, 2016-08-11, RCPT, 103.48, 4.5, 8.98 
M1, 100068, 2, 2016-07-11, RCPT, 103.48, 4.5, 8.98 
M1, 100068, 3, 2016-06-11, RCPT, 103.48, 4.5, 8.98 
M1, 200027, 4, 2016-05-11, RCPT, 103.48, 4.5, 8.98 
M1, 200027, 5, 2016-04-11, RCPT, 103.48, 4.5, 8.98 

我想讓查詢顯示：

comp_code, cust_code, CurrentBalance, 30-60, 60-90, 90-120, 120+ 
M1, 100068, 116.96, 233.92, 0, 0, 0 
M1, 200027, 0, 233.92, 0, 0, 0 
M1, 200027, 0, 0, 0, 0, 233.92 

我到目前爲止已經試過

SELECT comp_code, cust_code, inv_num, inv_date, sum(inv_amt) + sum(inv_tax1) 
+ sum(inv_tax2) as InvoiceTotal, 
DATEDIFF(day, inv_date, sysdate as Numberofdays, 'CurrentBalance' = 
CASE WHEN DATEDIFF(day,inv_date, sysdate < 30 then InvoiceTotal END, 
'30_days' = CASE WHEN DATEDIFF(day, inv_date, sysdate between 30 AND 60 
Then InvoiceTotal WHEN DATEDIFF(day, inv_date, sysdate > 90 Then 
InvoiceTotal END 
FROM c_inv_h 
WHERE comp_code='M1' 
GROUP BY comp_code, cust_code 

這可能是遙遠從我試圖實現，但我試着克通過它。

非常感謝提前！

Answer 1

你在正確的軌道上想着有條件的聚合。您只需刪除不參與聚合的列並清理語法錯誤。

SELECT 
    comp_code 
    ,cust_code 
    ,SUM(CASE 
      WHEN DATEDIFF(CURDATE(),inv_date) < 30 
      THEN COALESCE(inv_amt,0.00) + COALESCE(inv_tax1,0.00) + COALESCE(inv_tax2,0.00) 
      ELSE 0 
     END 
    ) AS CurrentBalance 
    ,SUM(CASE 
      WHEN DATEDIFF(CURDATE(),inv_date) >= 30 AND DATEDIFF(CURDATE(),inv_date) < 60 
      THEN COALESCE(inv_amt,0.00) + COALESCE(inv_tax1,0.00) + COALESCE(inv_tax2,0.00) 
      ELSE 0 
     END 
    ) AS "30-60" 
    ,SUM(CASE 
      WHEN DATEDIFF(CURDATE(),inv_date) >= 60 AND DATEDIFF(CURDATE(),inv_date) < 90 
      THEN COALESCE(inv_amt,0.00) + COALESCE(inv_tax1,0.00) + COALESCE(inv_tax2,0.00) 
      ELSE 0 
     END 
    ) AS "60-90" 
    ,SUM(CASE 
      WHEN DATEDIFF(CURDATE(),inv_date) >= 90 AND DATEDIFF(CURDATE(),inv_date) < 120 
      THEN COALESCE(inv_amt,0.00) + COALESCE(inv_tax1,0.00) + COALESCE(inv_tax2,0.00) 
      ELSE 0 
     END 
    ) AS "90-120" 
    ,SUM(CASE 
      WHEN DATEDIFF(CURDATE(),inv_date) >= 120 
      THEN COALESCE(inv_amt,0.00) + COALESCE(inv_tax1,0.00) + COALESCE(inv_tax2,0.00) 
      ELSE 0 
     END 
    ) AS "120+" 
FROM 
    c_inv_h 
WHERE 
    comp_code='M1' 
GROUP BY 
    comp_code, cust_code 
; 

我使用COALESCE以確保有一個值，因爲添加列時，如果添加1個+ NULL + 1個的結果將是NULL。當使用聚合函數時，例如SUM（）它會忽略NULL值。因爲您正在使用兩者取決於您的數據集，您可能需要將COALESCE幫助的0賦給NULL。

接下來我不使用BETWEEN，因爲BETWEEN包含了比較的兩個方面，所以如果你說一列之間在30到60之間，另一列在60到90之間，並且數額是60天過期，它將是在兩列中。

最後您的示例輸出對於您提供的示例數據不正確，因爲日期相距5,36,66,97和127天，但我非常肯定我明白你想要什麼。

希望有所幫助。