我试图在 SQL Server* 2005中创建一个 VIEW 。 *
SQL代码按这种方式工作(在VS2008中使用I麓m),但是在SQL Server中无法保存它,因为弹出错误消息“声明标量变量@StartDate”和“声明标量变量@EndDate”向上。
这是代码:
WITH Calendar AS (SELECT CAST(@StartDate AS datetime) AS Date UNION ALL SELECT DATEADD(d, 1, Date) AS Expr1 FROM Calendar AS Calendar_1 WHERE (DATEADD(d, 1, Date) < @EndDate)) SELECT C.Date, C2.Country, COALESCE (SUM(R.[Amount of people per day needed]), 0) AS [Allocated testers] FROM Calendar AS C CROSS JOIN dbo.Country AS C2 LEFT OUTER JOIN dbo.Requests AS R ON C.Date BETWEEN R.[Start date] AND R.[End date] AND R.CountryID = C2.CountryID GROUP BY C.Date, C2.Country
而 我的问题当然是-我应该究竟如何申报呢?
我尝试将以下代码放在第一位:
DECLARE @StartDate smalldatetime DECLARE @EndDate smalldatetime
但是,这并没有达到预期的效果,正如我所期望的那样-它只给了我另一个弹出消息:
“不支持声明游标SQL构造或语句。”
如Alex K所述,您应该将其编写为内联表值函数。这是描述它的文章。
简而言之,语法将类似于
CREATE FUNCTION dbo.GetForPeriod ( @StartDate datetime, @EndDate datetime) RETURNS TABLE RETURN SELECT [[ your column list ]] FROM [[ table list] WHERE [[some column] BETWEEN @StartDate AND @EndDate
您可以有一个选择查询(但是很复杂,可以使用CTE)。然后您将其用作
SELECT * FROM dbo.GetForPeriod('1-Jan-2010', '31-Jan-2010')