Sql 声明varchar视图问题

我有下面的代码，我想变成一个视图。但是，我不能在视图中声明varchar

有人能给我们建议一个解决这个问题的方法吗

Sql代码-

DECLARE @PROJECTNUMBER VarChar
SELECT     SUM(PAFeeAmount) FeeAmount
FROM          PA02101
WHERE      PAPROJNUMBER = @PROJECTNUMBER

---

谢谢，

如果需要变量，请改用表值函数：

---

如果需要变量，请改用表值函数：

---

如果试图将参数传递给视图，则不能这样做。在从视图中选择时，只需使用Group By和filter按如下方式进行查看

CREATE VIEW myView
AS
   SELECT  PAPROJNUMBER, SUM(PAFeeAmount) FeeAmount
   FROM   PA02101
   GROUP BY PAPROJNUMBER


--Select like below. (may be passing it to a stored procedure)
declare @projectNumber varchar(50) --remember to give a length 

select * from myView
where projectNumber = @projectNumber

---

如果试图将参数传递给视图，则不能这样做。在从视图中选择时，只需使用Group By和filter按如下方式进行查看

CREATE VIEW myView
AS
   SELECT  PAPROJNUMBER, SUM(PAFeeAmount) FeeAmount
   FROM   PA02101
   GROUP BY PAPROJNUMBER


--Select like below. (may be passing it to a stored procedure)
declare @projectNumber varchar(50) --remember to give a length 

select * from myView
where projectNumber = @projectNumber

尝试创建一个内联表值函数。例如：

CREATE FUNCTION dbo.fxSample(@PROJECTNUMBER VARCHAR(20))
RETURNS TABLE
AS
RETURN
(
    SELECT  SUM(PAFeeAmount) FeeAmount
    FROM    PA02101
    WHERE   PAPROJNUMBER = @PROJECTNUMBER
)

-- Then call like this, just as if it's a table/view just with a parameter
SELECT * FROM dbo.fxSample('hello')

尝试创建一个内联表值函数。例如：

CREATE FUNCTION dbo.fxSample(@PROJECTNUMBER VARCHAR(20))
RETURNS TABLE
AS
RETURN
(
    SELECT  SUM(PAFeeAmount) FeeAmount
    FROM    PA02101
    WHERE   PAPROJNUMBER = @PROJECTNUMBER
)

-- Then call like this, just as if it's a table/view just with a parameter
SELECT * FROM dbo.fxSample('hello')

---

您不能在视图中执行此操作，只需在没有WHERE子句的情况下执行此操作，然后从视图中筛选选择：SELECT*from Viewname WHERE…为什么要在视图中执行此操作？您不能在视图中执行此操作，只需在不使用WHERE子句的情况下对视图中的选择进行过滤：SELECT*from Viewname WHERE…为什么要在视图中使用此选项？