是否可以在视图中创建临时表并在选择后删除它？

Question

我需要改变一个视图,我想在SELECT之前引入2个临时表.

这可能吗？我怎么能这样做？

ALTER VIEW myView
AS 

SELECT *
INTO #temporary1

SELECT *
INTO #temporary2

SELECT * FROM #temporary1
UNION ALL 
SELECT * FROM #temporary1

DROP TABLE #temporary1
DROP TABLE #temporary2

当我尝试这个时,它抱怨ALTER VIEW必须是批处理中唯一的语句.

我怎样才能做到这一点？

Answer 1

不,视图由单个SELECT语句组成.您无法在视图中创建或删除表.

也许公用表表达式(CTE)可以解决您的问题.CTE是在单个语句的执行范围内定义的临时结果集,可以在视图中使用它们.

示例(取自此处) - 您可以将SalesBySalesPersonCTE视为临时表:

CREATE VIEW vSalesStaffQuickStats
AS
  WITH SalesBySalesPerson (SalesPersonID, NumberOfOrders, MostRecentOrderDate)
      AS
      (
            SELECT SalesPersonID, COUNT(*), MAX(OrderDate)
            FROM Sales.SalesOrderHeader
            GROUP BY SalesPersonID
      )
  SELECT E.EmployeeID,
         EmployeeOrders = OS.NumberOfOrders,
         EmployeeLastOrderDate = OS.MostRecentOrderDate,
         E.ManagerID,
         ManagerOrders = OM.NumberOfOrders,
         ManagerLastOrderDate = OM.MostRecentOrderDate
  FROM HumanResources.Employee AS E
  INNER JOIN SalesBySalesPerson AS OS ON E.EmployeeID = OS.SalesPersonID
  LEFT JOIN SalesBySalesPerson AS OM ON E.ManagerID = OM.SalesPersonID
GO

Answer 2

Stored Procedure您可以使用返回查询结果的方法来实现您想要做的事情。Views不适合/不适合这样的操作。