内部変数を持つSQLサブクエリを返します。

Question

マイアプリケーションは現金登録です。次のクエリは、トランザクションIDを受け取り、= 28715 TRANSACTIONIDのために、すなわち、この単一のトランザクションで販売された商品の1つまたは複数の行を返します。

DECLARE @SalesItems varchar(250); 
DECLARE @TransactionID int; 
SET @TransactionID = 28715; 


Select @SalesItems = coalesce(@SalesItems + ', ', '') + CAST(TransactionsPosLines.Description as varchar(250)) 
From 
    TransactionsPosLines 
    where TransactionsPosLines.TransactionId = @TransactionID 

select @SalesItems 

とリターン：

"Widget A, Widget B, Widget C" as a single string. 

私もその日のトランザクションの終了を持っています私は文字列（ウィジェットAなど...）をトランザクションレポートの最後に追加するレポートを作成します。私はこのレポートを実行すると

 Select 
      Transactions.TransactionId, 
      Transactions.TransactionDate, 
      Transactions.MoneyIn, 
      Transactions.MoneyOut, 
      Transactions.Description, 
      PaymentMethods.PaymentMethodName, 
      Transactions.TransactionRef, 
      Membership.Username, 
      Tills.Description As 'Till Name', 
      Transactions.Reason, 
    -- FOR THIS LAST COLUMN HERE I WANT TO SHOW THE OUTPUT OF THE QUERY ABOVE 
====>  SalesItems 
     From 
      Transactions Left Outer Join 
      Tills 
      On Transactions.TillId = Tills.TillId Inner Join 
      PaymentMethods 
      On Transactions.PaymentMethodId = PaymentMethods.PaymentMethodsID Inner Join 
      Membership 
      On Transactions.UserId = Membership.UserId Inner Join 
     Where 
      Transactions.TransactionDate >= @DateStart And 
      Transactions.TransactionDate <= @DateEnd 

は、だから私はこのような何かを得る：

TransactionId TransactionDate MoneyIn MoneyOut Description PaymentMethodName TransactionRef Username Till Name Reason SalesItems 
28715 31/08/2016 09:07 119.99 0 Sale - Card Card 24881 Chantal Till1 Null Widget A, Widget B, Widget C 

Answer 1

CROSS APPLY WITH FOR XML CONCATENATION METHOD：

Select 
    t.TransactionId, 
    t.TransactionDate, 
    t.MoneyIn, 
    t.MoneyOut, 
    t.Description, 
    p.PaymentMethodName, 
    t.TransactionRef, 
    m.Username, 
    tl.Description As 'Till Name', 
    t.Reason, 
    c.SalesItems 
From 
    Transactions t 
    LEFT JOIN Tills tl 
    ON t.TillId = tl.TillId 
    INNER JOIN PaymentMethods p 
    ON t.PaymentMethodId = p.PaymentMethodID 
    INNER JOIN Membership m 
    On t.UserId = m.UserId 
    CROSS APPLY 
    (SELECT STUFF(
     (SELECT ',' + CAST(tp.Description AS VARCHAR(100)) 
     FROM 
      TransactionPostLines tp 
     WHERE t.TransactionId = tp.TransactionId 
     FOR XML PATH('')) 
     ,1,1,'') as SalesItems) c 
Where 
    t.TransactionDate >= @DateStart 
    AND t.TransactionDate <= @DateEnd 

ASサブ列の定義で選択します。

Select 
    t.TransactionId, 
    t.TransactionDate, 
    t.MoneyIn, 
    t.MoneyOut, 
    t.Description, 
    p.PaymentMethodName, 
    t.TransactionRef, 
    m.Username, 
    tl.Description As 'Till Name', 
    t.Reason, 
    STUFF(
     (SELECT ',' + CAST(tp.Description AS VARCHAR(100)) 
     FROM 
      TransactionPostLines tp 
     WHERE t.TransactionId = tp.TransactionId 
     FOR XML PATH('')) 
     ,1,1,'') as SalesItems 
From 
    Transactions t 
    LEFT JOIN Tills tl 
    ON t.TillId = tl.TillId 
    INNER JOIN PaymentMethods p 
    ON t.PaymentMethodId = p.PaymentMethodID 
    INNER JOIN Membership m 
    On t.UserId = m.UserId 
Where 
    t.TransactionDate >= @DateStart 
    AND t.TransactionDate <= @DateEnd 

注使用して、表の別名は、コードやすくなりますが読んで書くこと！

Answer 2

私はあなたのメイン・クエリの各行に内側のクエリに結果を適用するために適用され、クロスを使用していました。これはあなたを助けかどうかを確認します。

Select 
     Transactions.TransactionId, 
     Transactions.TransactionDate, 
     Transactions.MoneyIn, 
     Transactions.MoneyOut, 
     Transactions.Description, 
     PaymentMethods.PaymentMethodName, 
     Transactions.TransactionRef, 
     Membership.Username, 
     Tills.Description As 'Till Name', 
     Transactions.Reason, 
-- HERE >> 
     --SalesItems = 
     dt.salesItems 
    From 
     Transactions Left Outer Join 
     Tills 
     On Transactions.TillId = Tills.TillId Inner Join 
     PaymentMethods 
     On Transactions.PaymentMethodId = PaymentMethods.PaymentMethodsID Inner Join 
     Membership 
     On Transactions.UserId = Membership.UserId 
     cross apply (
    select distinct stuff((
    Select ',' + CAST(TransactionsPosLines.Description as varchar(250)) 
From 
    TransactionsPosLines 
    where TransactionsPosLines.TransactionId = Transactions.TransactionId 
    FOR XML PATH('')),1,1,'') as salesItems 
) as dt 
    -- TransactionsPosLines 
    -- On TransactionsPosLines.TransactionId = Transactions.TransactionId 
    Where 
     Transactions.TransactionDate >= @DateStart And 
     Transactions.TransactionDate <= @DateEnd