使用子查询

Question

更新语句我有以下查询：

DECLARE @fromdate date = '2016-09-01' 
DECLARE @todate date = '2016-10-03' 

SELECT 
    inventoryKey, 
    SUM(DATEDIFF(DAY, transdate, @todate) * qty) AS daysavailable 
FROM 
    (SELECT 
     InventoryKey, 
     CONVERT(date, invch.transactiondate) AS transdate, 
     SUM(invch.additionqty + invch.SubtractionQty) AS qty 
    FROM 
     dw.dbo.inventorychange invch 
    WHERE 
     (TransactionDate IS NOT NULL OR TransactionType <> '') 
     AND TransactionType NOT IN ('TRANSFER IN', 'TRANSFER OUT', 'BALANCE', 'LEASED') 
     AND InventoryKey = 'A000HV9T' 
     AND TransactionDate BETWEEN @fromdate AND @todate 
    GROUP BY 
     invch.TransactionDate, InventoryKey) AS a 
GROUP BY 
    InventoryKey 

这工作对自己完全没问题。不过，我正在创建一个存储过程，它将执行一些计算，其中之一就是上面的计算。存储过程将返回一个表，其中此列将用实际值进行更新。但是，我不完全知道如何在子查询更新语句中准确地翻译它。

这是我下面有：

declare @inventorychanges table 
(
    inventorykey nvarchar(10), 
    warehouse  nvarchar(10), 
    transdate  date, 
    trantype  nvarchar(25), 
    additionqty  numeric, 
    subtractionqty numeric 

) 
insert into @inventorychanges (inventorykey, warehouse, transdate, trantype, additionqty, subtractionqty) 
select invch.inventorykey, invch.warehouse, invch.TransactionDate, invch.TransactionType, invch.additionqty, invch.SubtractionQty 
from dw.dbo.inventorychange invch 
join @icodes ic on ic.inventorykey = invch.inventorykey 

WHERE invch.TransactionDate BETWEEN @fromdate AND @todate 
and invch.warehouse = ISNULL(@location, '') 
AND (TransactionDate IS NOT NULL OR TransactionType <> '') 
AND TransactionType NOT IN ('TRANSFER IN' ,'TRANSFER OUT', 'BALANCE', 'LEASED') 


/* Update Days Available*/ 
UPDATE ic 
SET ic.daysavaialblepsgear = (
           SELECT SUM(invch.additionqty + invch.subtractionqty) 
            ) 
FROM @icodes ic, @inventorychanges invch 
where invch.inventorykey = ic.inventorykey 

然而，这似乎并没有被工作所应当的。 任何人都可以指出我在正确的方向，我如何才能做到这一点。

Answer 1

下面是使用CTE

DECLARE @fromdate date = '2016-09-01' 
DECLARE @todate date = '2016-10-03' 
;with cte as 
(
SELECT 
    inventoryKey, 
    SUM(DATEDIFF(DAY, transdate, @todate) * qty) AS daysavailable 
FROM 
    (SELECT 
     InventoryKey, 
     CONVERT(date, invch.transactiondate) AS transdate, 
     SUM(invch.additionqty + invch.SubtractionQty) AS qty 
    FROM 
     dw.dbo.inventorychange invch 
    WHERE 
     (TransactionDate IS NOT NULL OR TransactionType <> '') 
     AND TransactionType NOT IN ('TRANSFER IN', 'TRANSFER OUT', 'BALANCE', 'LEASED') 
     AND InventoryKey = 'A000HV9T' 
     AND TransactionDate BETWEEN @fromdate AND @todate 
    GROUP BY 
     invch.TransactionDate, InventoryKey) AS a 
GROUP BY 
    InventoryKey 
) 
UPDATE ic 
SET ic.daysavaialblepsgear = invch .daysavailable 
FROM @icodes ic 
Join CTE invch 
    ON invch.inventorykey = ic.inventorykey 

您也可以将代替CTE整个子查询的一种方法在JOIN

UPDATE ic 
SET ic.daysavaialblepsgear = invch .daysavailable 
FROM @icodes ic 
     JOIN (SELECT inventorykey, 
        Sum(Datediff(day, transdate, @todate) * qty) AS 
        daysavailable 
      FROM (SELECT inventorykey, 
          CONVERT(DATE, invch.transactiondate)   AS 
          transdate, 
          Sum(invch.additionqty + invch.subtractionqty) AS qty 
        FROM dw.dbo.inventorychange invch 
        WHERE (transactiondate IS NOT NULL 
           OR transactiontype <> '') 
          AND transactiontype NOT IN ( 
           'TRANSFER IN', 'TRANSFER OUT', 
           'BALANCE', 
           'LEASED' 
                 ) 
          AND inventorykey = 'A000HV9T' 
          AND transactiondate BETWEEN @fromdate AND @todate 
        GROUP BY invch.transactiondate, 
           inventorykey) AS a 
      GROUP BY inventorykey) invch 
     ON invch.inventorykey = ic.inventorykey