Question

我正在尝试设置标量值。需要的结果来自SELECT TOP 1 WITH TIES块。我该怎么做呢？

我试图做的方式是：

USE AdventureWorks2014
GO
CREATE FUNCTION funcGetLastFridayOrders
RETURNS SMALLINT
AS
BEGIN
    DECLARE @orders_quantity SMALLINT
    SELECT TOP 1 WITH TIES @orders_quantity = COUNT(*) 
    FROM Purchasing.PurchaseOrderHeader
    WHERE DATEPART(DAY,OrderDate) = 5
    GROUP BY OrderDate 
    ORDER BY OrderDate DESC
    RETURN @order_quantity
END

错误讯息：

必须声明标量变量“@order_quantity”

而

DECLARE @var INT
SELECT @var = intValue FROM table WHERE id = 1

工作正常。

Answer 1

这只是回归线上的一个错字。你写了“order_quantity”而不是“orders_quantity”。

这是更正后的陈述：

USE AdventureWorks2014
GO
CREATE FUNCTION funcGetLastFridayOrders
RETURNS SMALLINT
AS
BEGIN
    DECLARE @orders_quantity SMALLINT
    SELECT TOP 1 WITH TIES @orders_quantity = COUNT(*) 
    FROM Purchasing.PurchaseOrderHeader
    WHERE DATEPART(DAY,OrderDate) = 5
    GROUP BY OrderDate 
    ORDER BY OrderDate DESC
    RETURN @orders_quantity
END

Answer 2

您有语法错误

DECLARE @orders_quantity SMALLINT

但你使用的是

RETURN @order_quantity

SELECT T N WITH TIES @scalar_value = count（*）

2 个答案: