SQL：如何从递归查询创建视图？

问题：我想从递归查询中派生一个视图

查询的结构与此处的相同：

并将树视图表示为有序数据集

如何创建执行以下操作的视图：

;WITH Tree (ID, [NAME], PARENT_ID, Depth, Sort) AS
(
    SELECT ID, [NAME], PARENT_ID, 0 AS Depth, CONVERT(varchar(255), [Name]) AS Sort FROM Category
    WHERE PARENT_ID = 0
    UNION ALL
    SELECT CT.ID, CT.[NAME], CT.PARENT_ID, Parent.Depth + 1 AS Depth, 
    CONVERT(varchar(255), Parent.Sort + ' | ' + CT.[NAME]) AS Sort
    FROM Category CT
    INNER JOIN Tree as Parent ON Parent.ID = CT.PARENT_ID
)

-- HERE IS YOUR TREE, Depths gives you the level starting with 0 and Sort is the Name based path
SELECT ID, [NAME], PARENT_ID, Depth, Sort FROM Tree
ORDER BY Sort

---

它应该简单到：

CREATE VIEW YourViewName
AS
    WITH Tree (ID, [NAME], PARENT_ID, Depth, Sort) AS
    (
        SELECT ID, [NAME], PARENT_ID, 0 AS Depth, CONVERT(varchar(255), [Name]) AS Sort         
        FROM Category
        WHERE PARENT_ID = 0
        UNION ALL
        SELECT CT.ID, CT.[NAME], CT.PARENT_ID, Parent.Depth + 1 AS Depth, 
        CONVERT(varchar(255), Parent.Sort + ' | ' + CT.[NAME]) AS Sort
        FROM Category CT
        INNER JOIN Tree as Parent ON Parent.ID = CT.PARENT_ID
    )

    -- HERE IS YOUR TREE, Depths gives you the level starting with 0 and Sort is the Name based path
    SELECT ID, [NAME], PARENT_ID, Depth, Sort FROM Tree
GO

---

啊，分号，对不起，我没看到。PS：不，不是那么简单，只是几乎：您需要删除ORDERBY或将top 100%添加到select语句；-）您需要删除该订单，因为它不属于视图，SQL将拒绝它anyway@Quandary，@Damien:谢谢你在订购人上的介绍。剪切粘贴编码的危害之一！：-）我将进行适当的更新。您最好创建一个内联表值函数来实现这一点。然后，您可以参数化传递给它的父Id。最好在视图中执行此操作，并可能将主根uid添加为列，然后从存储过程中查询该视图。当您有很多数据时，表值函数将变得很慢，因为它们在内存中创建临时表，如果内存不足，这些临时表将被交换。