Question

我有以下表格测试

iD Name    ParentId   GroupID  DisplayingOrder
 ---------------------------------------------
    1            1        1      Null
    2            1        1      Null
    3            1        1      Null
    4            7        2      Null
    5            7        2      Null
    6            7        2      Null
    7            9        3      Null

如何修改它以获取

iD Name    ParentId   GroupID  DisplayingOrder
 ---------------------------------------------
    1            1        1      1
    2            1        1      2
    3            1        1      3
    4            7        2      1
    5            7        2      2
    6            7        2      3
    7            9        3      1

逻辑：对同一GroupID递增DisplaysOrder

Answer 1

您可以在一个查询中执行这两个更新，而不需要在两个语句中将其分解。见下文：

; WITH CTE 
AS
 (
 SELECT iDName, ParentId, GroupID,DisplayingOrder 
        ,DENSE_RANK() OVER (ORDER BY ParentId ASC) RN1
        ,ROW_NUMBER() OVER (PARTITION BY ParentId ORDER BY ParentId) RN2
  FROM TEST
 )
UPDATE CTE 
SET  GroupID         = RN1
    ,DisplayingOrder = RN2

`Sql Fiddle`

此外，如果您可以查看SQL SERVER RANKING FUNCTIONS，它将真正帮助您：）

Answer 2

这不是先前问题的完全重复。但是一种非常类似的方法可以起作用：

WITH toupdate AS
      (SELECT iDName, ParentId, GroupID,
              row_number() over (partition by groupid order by idName) as newDisplayingOrder
       FROM test t
      )
UPDATE toupdate
    SET DisplayingOrder = newDisplayingOrder;

您可以一步完成这两项任务：

WITH toupdate AS
      (SELECT t.*,
              dense_rank() over (order by ParentId) as newGroupId,
              row_number() over (partition by groupid order by idName) as newDisplayingOrder
       FROM test t
      )
UPDATE toupdate
    SET GroupId = newGroupId,
        DisplayingOrder = newDisplayingOrder;

Answer 3

使用此查询并更新具有不同iD名称的所有行

Update test set DisplayingOrder = 1 where iD Name = 1;

Answer 4

WITH CTE_View AS （选择t1。*， dense_rank（）over（由ParentId排序）为newGroupId， row_number（）over（由idid分组groupid）作为newDisplayingOrder FROM tab t1 ）更新CTE_View SET GroupId = newGroupId， ShowingOrder = newDisplayingOrder;

修改表中的列

4 个答案:

`Sql Fiddle`