Question

我正在尝试使用以下代码在SQL中创建一个新函数：

CREATE FUNCTION PROFITIBLE_CATEGORIES (@startDate date, @endDate date)
RETURNS @ResultTable TABLE (Name varchar(20), AMOUNT INT)
AS BEGIN
    @ResultTable =  SELECT TOP 5 NAME, COUNT(*) AS AMOUNT
                    FROM dbo.PURCHASES P JOIN 
                        (SELECT PInC.NAME, PInC.[Walmart number],
                                 PInSP.[Purchase Id] AS PInSP_PURCHASE_ID,
                                 DPP.[Purchase Id] AS DPP_PURCHASE_ID

                         FROM dbo.PRODUCTS_IN_CATEGORIES PInC LEFT JOIN 
                         dbo.Products_in_self_pick_up_purchases PInSP ON 
                         PInC.[Walmart number] = PInSP.[Walmart number] LEFT JOIN
                         dbo.Delivered_products_purchases DPP ON 
                         DPP.[Walmart number] = PInC.[Walmart number]) X
                         ON (P.[Purchase Id] = X.DPP_PURCHASE_ID) 
                         OR (P.[Purchase Id] = X.PInSP_PURCHASE_ID)
                    WHERE [Date] < @endDate AND [Date] > @startDate
                    GROUP BY NAME
                    ORDER BY AMOUNT
    RETURN 
    END

但我收到以下错误：

Msg 102，Level 15，State 1，Procedure PROFITIBLE_CATEGORIES，Line 4
'@ResultTable'附近的语法不正确。

任何人都可以帮忙吗？这可能是语法错误，但我是新手。提前谢谢。

Answer 1

稍微更有效的方法是内联表值函数：

CREATE FUNCTION dbo.PROFITIBLE_CATEGORIES
(
  @startDate date, 
  @endDate date
)
RETURNS TABLE
WITH SCHEMABINDING
AS
    RETURN 
    (
       SELECT TOP (5) NAME, COUNT(*) AS AMOUNT
       FROM dbo.PURCHASES P JOIN 
                       (SELECT PInC.NAME, PInC.[Walmart number],
                                 PInSP.[Purchase Id] AS PInSP_PURCHASE_ID,
                                 DPP.[Purchase Id] AS DPP_PURCHASE_ID

                         FROM dbo.PRODUCTS_IN_CATEGORIES PInC LEFT JOIN 
                         dbo.Products_in_self_pick_up_purchases PInSP ON 
                         PInC.[Walmart number] = PInSP.[Walmart number] LEFT JOIN
                         dbo.Delivered_products_purchases DPP ON 
                         DPP.[Walmart number] = PInC.[Walmart number]) X
                         ON (P.[Purchase Id] = X.DPP_PURCHASE_ID) 
                         OR (P.[Purchase Id] = X.PInSP_PURCHASE_ID)
                    WHERE [Date] < @endDate AND [Date] > @startDate
                    GROUP BY NAME
                    ORDER BY AMOUNT
    );
GO

Answer 2

如果要在表格中插入行，请尝试使用

   CREATE FUNCTION PROFITIBLE_CATEGORIES (@startDate date, @endDate date)
   RETURNS @ResultTable TABLE (Name varchar(20), AMOUNT INT)
   AS BEGIN
    INSERT INTO @ResultTable
    SELECT TOP 5 NAME, COUNT(*) AS AMOUNT
                FROM dbo.PURCHASES P JOIN 
                    (SELECT PInC.NAME, PInC.[Walmart number],
                             PInSP.[Purchase Id] AS PInSP_PURCHASE_ID,
                             DPP.[Purchase Id] AS DPP_PURCHASE_ID

                     FROM dbo.PRODUCTS_IN_CATEGORIES PInC LEFT JOIN 
                     dbo.Products_in_self_pick_up_purchases PInSP ON 
                     PInC.[Walmart number] = PInSP.[Walmart number] LEFT JOIN
                     dbo.Delivered_products_purchases DPP ON 
                     DPP.[Walmart number] = PInC.[Walmart number]) X
                     ON (P.[Purchase Id] = X.DPP_PURCHASE_ID) OR (P.[Purchase Id] = X.PInSP_PURCHASE_ID)
                WHERE [Date] < @endDate AND [Date] > @startDate
                GROUP BY NAME
                ORDER BY AMOUNT
RETURN 
END

尝试创建新函数时，Sql代码无法正常工作

2 个答案: