条件级联T-SQL

Question

我已经观察到一种类似的问题，即T SQL条件字符串连接，但是stil无法让我听到如何做的事情。我什至不知道从哪里开始。

到目前为止，我的查询如下所示：

SELECT
    R.ReservationsID 'Job No',
    C.[Trading Name]'Customer Name',
    C.[Business Address1] 'Customer Address1',
    C.[Business Address2]'Customer Address2',
    C.[Business Town]'Customer Town',
    C.[Business Postal Code]'Customer Postcode',
    C.CustomerID' Customer ID',
    I.InvoiceID' InvoiceID' ,
    'address' AS [Supplier Address 1], --CHANGE
    'address' AS [Supplier Address 2], --CHANGE
    'town' AS [town], --CHANGE
    'post code' AS [Post Code], --CHANGE
    'Supplier' AS [Supplier], --CHANGE
    R.Quantity 'Purchase QTY',
    SM.Instock 'QTY In Stock',
    SM.StockCode 'Product Code',
    SM.StockDescription 'Sale Unit',
    R.[Delivery Date],
    V.[Registration]'Vehicle Reg',
    I.[NET] 'Sale Price',
    I.[GROSS] 'Total Sale Price',
    R.[Delivery Date] ' Del Date',
    R.Quantity as qty,  --CHANGE
    SM.StockDescription AS [Purchase Unit],  --CHANGE
    0.0 AS [Purchase total price],  --CHANGE
    0.0 AS [PO No],
    (D.Forename + ' ' + D.Surname) AS [Driver Name],
    (convert(varchar(10),dateadd(MM,-7,GETDATE()),103)) AS 'Date -7 Months',
    0.0 AS [Purchase Invoice],
    0.0 AS [Purchase Price],
    RI.StockID
FROM  
    dbo.tblReservation R
    LEFT JOIN tblReservationItems RI 
        ON RI.ReservationsID = R.ReservationsID 
            AND (RI.Deleted != 1) AND (R.Completed !=0)
    LEFT JOIN tblInvoice I ON I.InvoiceID = R.Invoice AND (I.Deleted != 1) 
    LEFT JOIN tblCustomer C ON C.CustomerID = R.CustomerID 
    LEFT JOIN tblStockMaster SM ON SM.StockID = RI.StockID
    LEFT JOIN dbo.tblvehicle V ON v.VehicleID = R.VehicleID
    LEFT JOIN dbo.tblDriver D ON D.DriverID = R.DriverID
WHERE      (I.Deleted = 0)
    AND (r.completed=1)
    AND [Delivery Date] >= DATEADD(month, -7, GETDATE())
    AND [Delivery Date] IS NOT NULL

该报告基于R.ReservationsID 'Job No'但是每个“ Job No”可以有多个“ Sale Units”和“ Purchase Units”，因此我要尝试的是将各种“ purchase unit”和“ Sale”串联起来单位”分成1个单列，以逗号分隔，以与“职位编号”对齐。

让我更加困惑的是，我还想将“购买单位和销售单位”的“数量”合并到该列中，这样看起来就有点像这样。

所需输出：

New_Concat_Column

[QTY] + 'x' + [SALE UNIT] + ","[QTY] + 'x' + [SALE UNIT] + ","

任何有关如何做到这一点的指针将不胜感激。 在纯SQL中执行此操作会很好，但也欢迎Crystal Reports中的任何方法。

Answer 1

您需要使用CAST或CONVERT来将数字数据更改为字符串：

Cast( R.Quantity as VarChar(10) ) + 'x' + SM.StockDescription + ', ' +
  Cast( R.Quantity as VarChar(10) ) + 'x' + SM.StockDescription  + ',' as New_Concat_Column

另外：用数据库软件和版本（例如SQL Server 2008R2）标记数据库问题并包括适用的表架构通常很有帮助。 我以为“ Sale Unit是某种字符串。