I have one big query for performance related in SQL Server 2005.
I have data like this
id parentId
1 null
2 1
3 1
4 2
5 4
6 3
I want the order for the records by downline with parentId and id wise like
id Order
1 1
2 2
4 3
5 4
3 5
4 6
I don't want to use loop, because loop is creating the problem if high number of rows. Please give me easy way to do it and hurting performance.
Updated, Please run the script below
create table [mytable] ( [id] int, [parentId] int ) GO
INSERT INTO [mytable] ([id],[parentId])VALUES(1,NULL) INSERT INTO [mytable] ([id],[parentId])VALUES(2,6) INSERT INTO [mytable] ([id],[parentId])VALUES(4,9) INSERT INTO [mytable] ([id],[parentId])VALUES(5,4) INSERT INTO [mytable] ([id],[parentId])VALUES(6,13) INSERT INTO [mytable] ([id],[parentId])VALUES(7,13) INSERT INTO [mytable] ([id],[parentId])VALUES(8,5) INSERT INTO [mytable] ([id],[parentId])VALUES(9,1) INSERT INTO [mytable] ([id],[parentId])VALUES(13,1) GO
; WITH q AS ( SELECT id, parentId, CAST(id AS VARCHAR(MAX)) + '/' AS path FROM mytable WHERE parentId IS NULL UNION ALL SELECT t.id, t.parentId, q.path + CAST(t.id AS VARCHAR(MAX)) + '/' FROM q JOIN mytable t ON t.parentId = q.id ) SELECT *, ROW_NUMBER() OVER (ORDER BY path) AS rn FROM q ORDER BY path GO
The result of this query ID ParentId Path rn 1 NULL 1/ 1 13 1 1/13/ 2 6 13 1/13/6/ 3 2 6 1/13/6/2/ 4 7 13 1/13/7/ 5 9 1 1/9/ 6 4 9 1/9/4/ 7 5 4 1/9/4/5/ 8 8 5 1/9/4/5/8/ 9
But i want the result for rn from avove result first 1 then 1/9 then1/9/... then 1/13/ then 1/13/... .Please give me the solution for that.
I want result like
ID ParentId Path rn
1 NULL 1/ 1
13 1 1/13/ 6
6 13 1/13/6/ 7
2 6 1/13/6/2/ 8
7 13 1/13/7/ 9
9 1 1/9/ 2
4 9 1/9/4/ 3
5 4 1/9/4/5/ 4
8 5 1/9/4/5/8/ 5
WITH q AS
(
SELECT id, parentId, CAST(id AS VARCHAR(MAX)) AS path
FROM mytable
WHERE parentId IS NULL
UNION ALL
SELECT t.id, t.parentId, q.path + '/' + CAST(t.id AS VARCHAR(MAX))
FROM q
JOIN mytable t
ON t.parentId = q.id
)
SELECT *, ROW_NUMBER() OVER (ORDER BY path) AS rn
FROM q
ORDER BY
path
In above Have one more question. you are using the order by path suppose,in the case of the records like 1/13 and 1/2 , so order by is comming 1/13 and 1/2, but i want the order 1/2 and then 1/13 , because 2 is less then 13.
WITH q AS
(
SELECT id, parentId, CAST(id AS VARCHAR(MAX)) + '/' AS path
FROM mytable
WHERE parentId IS NULL
UNION ALL
SELECT t.id, t.parentId, q.path + CAST(t.id AS VARCHAR(MAX)) + '/'
FROM q
JOIN mytable t
ON t.parentId = q.id
)
SELECT *, ROW_NUMBER() OVER (ORDER BY path) AS rn
FROM q
ORDER BY
path
我无法确切说明您的数据库是什么样子,但是这样的工作应该可以
Select id, [Order] From Table1 Order By Order, id
select id, parentid as order from table
order by coalesce(parentid, 9999), id
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