Question

我在SQL Server 2012中有这个查询，但是我已经将顺序（Id，Slug，CategoryName）更改为（Id，CategoryName，Slug）以匹配返回的数据和列名称，现在我得到了这个错误：

Msg 240，Level 16，State 1，Line 1
锚和递归查询“categoryPath”列“CategoryName”中的递归部分之间的类型不匹配

这是查询：

WITH categoryPath(Id, CategoryName, Slug)
AS
(
    SELECT 
        Id, CategoryName, Slug 
    FROM Categories
    WHERE ParentCategoryId IS NULL

    UNION ALL

    SELECT 
        Categories.Id,
        CAST(categoryPath.CategoryName + ' / ' + categories.CategoryName AS NVARCHAR(150)),
        categories.Slug
    FROM Categories
    JOIN categoryPath ON Categories.ParentCategoryId = categoryPath.Id
)
SELECT * 
FROM [ItemCategories]
JOIN categoryPath ON [ItemCategories].CategoryId = categoryPath.Id 
WHERE [ItemCategories].StockId = '5'

Answer 1

当我收到这个错误时，我只是施展得很好而且很快就会有效：

WITH categoryPath(Id, CategoryName, Slug) AS (
      SELECT Id, cast(CategoryName as nvarchar(150)), cast(Slug as nvarchar(150))
      FROM Categories
      WHERE ParentCategoryId IS NULL
      UNION ALL
      SELECT Categories.Id,
             CAST(categoryPath.CategoryName + ' / ' + categories.CategoryName AS NVARCHAR(150)),
             CAST(categories.Slug as nvarchar(150))
      FROM Categories JOIN
           categoryPath
           ON Categories.ParentCategoryId=categoryPath.Id
     )
. . .

类型不在锚和列中的递归部分之间匹配

1 个答案: