sql server: Parent/Child hierarchy tree view

sql server - Parent/Child hierarchy tree view - Stack Overflow

---
declare @pc table(CHILD_ID int, PARENT_ID int, [NAME] varchar(80));
 
insert into @pc
select 1,NULL,'Bill' union all
select 2,1,'Jane' union all
select 3,1,'Steve' union all
select 4,2,'Ben' union all
select 5,3,'Andrew' union all
select 6,NULL,'Tom' union all
select 7,8,'Dick' union all
select 8,6,'Harry' union all
select 9,3,'Stu' union all
select 10,7,'Joe';
 
 
; with r as (
      select CHILD_ID, PARENT_ID, [NAME], depth=0, sort=cast(CHILD_ID as varchar(max))
      from @pc
      where PARENT_ID is null
      union all
      select pc.CHILD_ID, pc.PARENT_ID, pc.[NAME], depth=r.depth+1, sort=r.sort+cast(pc.CHILD_ID as varchar(30))
      from r
      inner join @pc pc on r.CHILD_ID=pc.PARENT_ID
      where r.depth<32767
)
select tree=replicate('-',r.depth*3)+r.[NAME]
from r
order by sort
option(maxrecursion 32767);
GO



--https://www.sqlteam.com/articles/more-trees-hierarchies-in-sql


SELECT a.ID, a.CategoryName, COALESCE(b.CategoryName,'-') AS 'ParentName'
FROM Category AS a LEFT JOIN Category AS b on a.ParentID = b.ID
GO


create table pc ( parent varchar(10), child varchar(10) )

insert into pc values('a','b');
insert into pc values('a','c');
insert into pc values('b','e');
insert into pc values('b','f');
insert into pc values('a','d');
Insert into pc values('b','g');
insert into pc values('c','h');
insert into pc values('c','i');
insert into pc values('d','j');
insert into pc values('f','k');
insert into pc values('x','y');
insert into pc values('y','z');
insert into pc values('m','n');

 DECLARE @parent varchar(10) = 'a';
 WITH cte AS
 (
  select null parent, @parent child, 0 as level
   union
  SELECT  a.parent, a.child , 1 as level
    FROM pc a
   WHERE a.parent = @parent
   UNION ALL
  SELECT a.parent, a.child , c.level +    1
  FROM pc a JOIN cte c ON a.parent = c.child
  )
  SELECT distinct parent, child , level
  FROM cte
  order by level, parent
  go

  -- https://stackoverflow.com/questions/9676637/sql-parent-child-tree-with-sort-order
  -- https://stackoverflow.com/questions/49903446/sql-parent-child-tree-data-return-only-completed-tree-nodes-from-list
  -- https://www.sqlteam.com/articles/more-trees-hierarchies-in-sql
  declare @relations table(ParentID int, ChildID int, SortOrder int, treeID int);

insert into @relations values
(0,1,0,0), (1,2,1,0), (2,3,2,0), (2,4,1,0), (2,6,3,0), (1,7,2,0), (1,9,3,0), (9,10,1,0), (9,12,2,0) --tree 0
, (0,1,0,1), (1,2,1,1), (2,3,2,1), (2,4,1,1), (2,6,3,1), (1,7,2,1), (1,9,3,1), (9,10,1,1), (9,12,2,1) --tree 1

; with cte(ParentId,ChildId,SortOrder,depth,agg,treeID) as (
    select null,ParentId,SortOrder,0
    , right('0000000'+CAST(treeID as varchar(max)),7)
        +right('0000000'+CAST(SortOrder as varchar(max)),7)
    , treeID
    from @relations where ParentId=0
    union all
    select cte.ChildId,r.ChildId,r.SortOrder,cte.depth+1
    , cte.agg
        +right('0000000'+CAST(r.treeID as varchar(max)),7)
        +right('0000000'+CAST(r.SortOrder as varchar(max)),7)
        +right('0000000'+CAST(r.ChildId as varchar(max)),7)
    , r.treeID
    from cte
    inner join @relations r on r.ParentID=cte.ChildId
    where cte.depth<32767
    and r.treeID=cte.treeID
)
select
tree=case depth when 1 then cast(ParentID as varchar(30))+' (sort '+cast(SortOrder as varchar(30))+')'
    else REPLICATE(CHAR(9),depth-1)
        + cast(ChildId as varchar(30))+' (sort '+cast(SortOrder as varchar(30))+')'
    end
from cte
where depth>0
order by agg
option (maxrecursion 32767);
go


---顺序排列Geovin Du PageSet,CategoryIsDisplay,CategoryPojectId

WITH cte AS
(
  SELECT 
    ID, 
    [ParentID],
    CategoryName,
	PageSet,
    IdOrder,
    CAST(0 AS varbinary(max)) AS Level
  FROM Category
  WHERE [ParentID] is null and CategoryIsDisplay=1 and CategoryPojectId=1
  UNION ALL
  SELECT 
    i.ID, 
    i.[ParentID],
    i.CategoryName,
	i.PageSet,
    i.IdOrder,  
    Level + CAST(i.ID AS varbinary(max)) AS Level
  FROM Category i
  INNER JOIN cte c
    ON c.ID = i.[ParentID]
)
SELECT 
  ID, 
  [ParentID],
  CategoryName,
  PageSet,
  IdOrder
FROM cte
ORDER BY [Level];
go

　　

WITH cte AS
(
  SELECT 
    ID, 
    [ParentID],
    CategoryName,
	PageSet,
    IdOrder,
	dbo.f_getlevel(ID) AS Dulv,
    CAST(0 AS varbinary(max)) AS Level	
  FROM Category
  WHERE [ParentID] is null and CategoryIsDisplay=1 and CategoryPojectId=1
  UNION ALL
  SELECT 
    i.ID, 
    i.[ParentID],
    i.CategoryName,
	i.PageSet,
    i.IdOrder, 
	dbo.f_getlevel(i.ID) AS Dulv,
    Level + CAST(i.ID AS varbinary(max)) AS Level	
  FROM Category i
  INNER JOIN cte c
    ON c.ID = i.[ParentID]
)
SELECT 
  ID, 
  [ParentID],
  CategoryName,
  PageSet,
  IdOrder,
  Dulv
FROM cte
ORDER BY [Level];
go

--
WITH cte AS
(
  SELECT 
    ID, 
    [ParentID],
    CategoryName,
	PageSet,
    IdOrder,
    dbo.f_getlevel(ID) AS Level
  FROM Category
  WHERE [ParentID] is null and CategoryIsDisplay=1 and CategoryPojectId=1
  UNION ALL
  SELECT 
    i.ID, 
    i.[ParentID],
    i.CategoryName,
	i.PageSet,
    i.IdOrder,  
    dbo.f_getlevel(i.ID) AS Level
  FROM Category i
  INNER JOIN cte c
    ON c.ID = i.[ParentID]
)
SELECT 
  ID, 
  [ParentID],
  CategoryName,
  PageSet,
  IdOrder,
  Level
FROM cte
ORDER BY Level;
go