具有多個表和IF MySQL的SUM項目和數量

-1

我想顯示所有項目數量。但數量在不同的表。具有多個表和IF MySQL的SUM項目和數量

輸出示例：

Item Quantity 
Item1 34 
Item2 10 
Item3 0 
........

我有一個代碼，可以盤點數量但單項只。

SELECT SUM(ROUND(Quantity)) FROM(
SELECT 
COALESCE(SUM(od.Quantity),0) as 'Quantity' 
FROM sts as T1 
LEFT JOIN orderset_details as od ON T1.OrdersetId = od.OrdersetId 
WHERE od.ItemId = '4786' 
UNION ALL 
SELECT 
COALESCE(SUM(od.Quantity),0) as 'Quantity' 
FROM drs as T2 
LEFT JOIN orderset_details as od ON T2.OrdersetId = od.OrdersetId 
WHERE od.ItemId = '4786' 
UNION ALL 
SELECT 
COALESCE(SUM(IF(r.AddsToStock = '1', od.Quantity, 0 - od.Quantity)),0) as 'Quantity' 
FROM stockadjustment as T3 
LEFT JOIN reason as r ON r.ReasonId = T3.ReasonId 
LEFT JOIN orderset_details as od ON T3.OrdersetId = od.OrdersetId 
WHERE od.ItemId = '4786' 
UNION ALL 
SELECT 
COALESCE(SUM(IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity)),0) as 'Quantity' 
FROM issueslip as T4 
LEFT JOIN orderset_details as od ON T4.OrdersetId = od.OrdersetId 
WHERE od.ItemId = '4786' 
UNION ALL 
SELECT 
COALESCE(SUM(IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity)),0) as 'Quantity' 
FROM invoice as T4 
LEFT JOIN orderset_details as od ON T4.OrdersetId = od.OrdersetId 
WHERE od.ItemId = '4786') as t

我如何能實現使用此代碼的項目？

表名items和id爲ItemId

來源

2016-07-26 Meyka Jograt

'LEFT JOIN x，其中x'是一樣的'INNER JOIN x' – Strawberry

如果你喜歡，可以考慮下列行爲這個簡單的兩步過程：1.如果您還沒有這樣做，提供適當的CREATE和INSERT語句（和/或sqlfiddle），以便我們可以更容易地複製問題。 2.如果您還沒有這樣做，請提供與步驟1中提供的信息相對應的所需結果集。 – Strawberry

@Strawberry對不起，我是MySQL的新手，雖然我已經使用了多年。這是我第一次遇到太多的連接。 –

創建該存儲功能：

DELIMITER // 

CREATE FUNCTION getItemQty(
    _itemID INT(10) 
) 
RETURNS INT 
BEGIN 

RETURN (SELECT 
     SUM(ROUND(Quantity)) 
    FROM (
     SELECT 
      COALESCE(SUM(od.Quantity),0) as Quantity 
     FROM sts as T1 
     LEFT JOIN orderset_details as od 
      ON T1.OrdersetId = od.OrdersetId 
     WHERE od.ItemId = _itemID 
     UNION ALL 
     SELECT 
      COALESCE(SUM(od.Quantity),0) as Quantity 
     FROM drs as T2 
     LEFT JOIN orderset_details as od 
      ON T2.OrdersetId = od.OrdersetId 
     WHERE od.ItemId = _itemID 
     UNION ALL 
     SELECT 
      COALESCE(
       SUM(
        IF(r.AddsToStock = '1', od.Quantity, 0 - od.Quantity) 
       ),0 
      ) as Quantity 
     FROM stockadjustment as T3 
     LEFT JOIN reason as r 
      ON r.ReasonId = T3.ReasonId 
     LEFT JOIN orderset_details as od 
      ON T3.OrdersetId = od.OrdersetId 
     WHERE od.ItemId = _itemID 
     UNION ALL 
     SELECT 
      COALESCE(
       SUM(
        IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity) 
       ),0 
      ) as Quantity 
     FROM issueslip as T4 
     LEFT JOIN orderset_details as od 
      ON T4.OrdersetId = od.OrdersetId 
     WHERE od.ItemId = _itemID 
     UNION ALL 
     SELECT 
      COALESCE(
       SUM(
        IF(T4.OrdersetId = od.OrdersetId, 0 - od.Quantity, -1 * od.Quantity) 
       ),0 
      ) as Quantity 
     FROM invoice as T4 
     LEFT JOIN orderset_details as od 
      ON T4.OrdersetId = od.OrdersetId 
     WHERE od.ItemId = _itemID 
    ) as t); 
END//

使用查詢來獲取數據。

SELECT 
    ItemId, 
    getItemQty(ItemId) AS quantity 
FROM items

來源

2016-07-26 16:00:59

我晚點試試，因爲我需要一些睡眠，但我認爲這是我正在尋找:)虐待後測試。謝謝你回答（y） –

'＃1054 - 'where子句'中的未知列'i.ItemId' –

我看到，這是因爲我們有兩級子查詢，我們無法訪問外部查詢的數據。嘗試第二個查詢。如果它不起作用，我仍然可以嘗試。 –

具有多個表和IF MySQL的SUM項目和數量

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