SQL如何重用临时表答案

【问题标题】：SQL how to reuse temp tableSQL如何重用临时表
【发布时间】：2014-05-11 13:21:26
【问题描述】：

我有一个复杂的查询来选择带有“with”的分页记录，我想将最后一个临时表重用于其他用途，例如记录计数：

;with ProductCatIDs
    as
    (
       select
          ID, ParentID, Name
       from
          [tbl_Categories]
       where
          ID = @CatID
       union all
       select
          m.ID, m.ParentID, m.Name
       from
          [tbl_Categories] m
       join
          ProductCatIDs on ProductCatIDs.ID = m.ParentID
    ),

    ProductsFiltered as (

SELECT    DISTINCT tbl_Products.*
FROM         tbl_ProductCategories RIGHT OUTER JOIN
                      tbl_Products ON tbl_ProductCategories.ProductID = tbl_Products.ID
WHERE     tbl_Products.Enabled = 'true' and (tbl_ProductCategories.CategoryID IN (

    select id
    from ProductCatIDs

))),

#ProductsNumbered as (

Select *, ROW_NUMBER() OVER (order by ID DESC) as RowNumber FROM ProductsFiltered

    )

SELECT * FROM #ProductsNumbered As tbl_Products
    Where 
    RowNumber > @FirstRec 
    And RowNumber < @LastRec



SELECT Count(*) FROM #ProductsNumbered

最后一条语句返回错误 Invalid object name '#ProductsNumbered'

如何重用#ProductsNumbered 以避免仅为一个简单的计数器计算整个 SP？

SELECT Count(*) FROM #ProductsNumbered

【问题讨论】：

标签： sql sql-server pagination temp-tables reusability

【解决方案1】：

不要让#ProductsNumbered 成为公用表表达式的一部分，而是从 ProductsFiltered 手动插入。然后你应该可以重复使用它。

;with ProductCatIDs
 as
  (
   ----SNIPPED TO KEEP POST SMALL-------
  ), ProductsFiltered as (
    ----SNIPPED TO KEEP POST SMALL-------            
  ),
  SELECT *, 
     ROW_NUMBER() OVER (order by ID DESC) as RowNumber 
  INTO #ProductsNumbered 
  FROM ProductsFiltered

通过这种方式，您应该可以访问公共表表达式范围之外的临时表，并且可以在其上运行多个查询。

【讨论】：