SQL Server 查询 CTE 父子，在 2012 本地工作，但在 2012 现场不工作，类型不匹配答案

【问题标题】：SQL Server query CTE parent child, works in 2012 local but not in 2012 live, types don't matchSQL Server 查询 CTE 父子，在 2012 本地工作，但在 2012 现场不工作，类型不匹配
【发布时间】：2017-10-27 15:57:53
【问题描述】：

此查询在一个服务器版本中有效，但在另一个版本中无效。

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[EventDetails]
    @EventID AS VARCHAR(20)
AS
BEGIN
    WITH CTE(CategoryID, FullCategName, OrderString) AS
    (
        SELECT 
            CategoryID, 
            CAST(CategoryName AS VARCHAR(MAX)),
            CAST(CAST(CategoryID AS CHAR(5)) AS VARCHAR(MAX)) OrderString
        FROM 
            CategoryTbl 
        WHERE 
            ParentCategoryIDf is NULL 

        UNION ALL

        SELECT 
            p.CategoryID, 
            CAST(c.FullCategName + ' >> ' + p.CategoryName AS VARCHAR(MAX)),
            CAST(c.OrderString + CAST(p.CategoryID AS CHAR(5)) AS VARCHAR(MAX)) OrderString
        FROM 
            CategoryTbl p
        JOIN
            CTE c ON c.CategoryID = p.ParentCategoryIDf
    )
    SELECT
        (SELECT TOP 1 i.ImageUrl 
         FROM ImageTbl i 
         WHERE i.ProductIDf = p.EventID) AS ImageURL, *   
    FROM
        EventTbl p
    LEFT JOIN
        CTE c on c.CategoryID = p.CategoryIDf
    WHERE
        p.EventID = @EventID        
END

【问题讨论】：

所以...我不得不问...monsters_db 中有什么内容？ ......这是怪物，不是吗？
请注意，根据那里的版本号，您的本地 express 实例是 SQL Server 2014。

标签： sql-server type-conversion common-table-expression

【解决方案1】：

这可能是排序规则问题，试试这个：

WITH CTE(CategoryID, FullCategName, OrderString) AS (
  SELECT 
      CategoryID
    , cast(CategoryName as varchar(max)) Collate SQL_Latin1_General_CP1_CI_AS as FullCategName 
    , cast(cast(CategoryID as char(5)) as varchar(max)) Collate SQL_Latin1_General_CP1_CI_AS as OrderString
  FROM CategoryTbl 
  WHERE ParentCategoryIDf is NULL 
  UNION ALL
  SELECT 
      p.CategoryID
    , cast(c.FullCategName + ' >> ' + p.CategoryName as varchar(max)) Collate SQL_Latin1_General_CP1_CI_AS
    , cast(c.OrderString + cast(p.CategoryID as char(5)) as varchar(max)) Collate SQL_Latin1_General_CP1_CI_AS --OrderString
  FROM CategoryTbl p
    JOIN CTE c 
      ON c.CategoryID = p.ParentCategoryIDf
)

select  
  (select top 1 i.ImageUrl 
   from ImageTbl i 
   where i.ProductIDf=p.EventID) as ImageURL
  , *  
  from EventTbl p
    left join CTE c on c.CategoryID=p.CategoryIDf
    where p.EventID=@EventID
end

参考：

T-SQL CTE Error: Types don't match between the anchor and the recursive part

【讨论】：

感谢支持