Comments on: SQL SERVER – Simple Example of Recursive CTE

By: SQL SERVER – Convert Subquery to CTE – SQL in Sixty Seconds #001 – Video « SQL Server Journey with SQL Authority

Wed, 08 Feb 2012 01:32:05 +0000

[...] on CTE: Simple Example of Recursive CTE Multiple CTE in One SELECT Statement Query Common Table Expression (CTE) and Few Observation Delete [...]

By: ramesh :)

ramesh :) — Tue, 07 Feb 2012 12:43:00 +0000

Try this:

create table #temp1 (rno int, points varchar(20))
INSERT INTO #temp1 VALUES (1,234)
INSERT INTO #temp1 VALUES(2,324)
INSERT INTO #temp1 VALUES(2,746)
INSERT INTO #temp1 VALUES(3,876)
INSERT INTO #temp1 VALUES(3,764)
INSERT INTO #temp1 VALUES(4,100)
INSERT INTO #temp1 VALUES(4,834)

select * from #temp1

select distinct a.rno,
substring(
(select points + ‘,’ from #temp1 b where a.rno=b.rno order by a.rno for xml path(”)),0,
LEN(
(select points + ‘,’ from #temp1 b where a.rno=b.rno order by a.rno for xml path(”)))
)
from #temp1 a

By: satish kumar

satish kumar — Fri, 27 Jan 2012 09:58:00 +0000

Thanks Pinal.

By: SQL SERVER – Common Gotcha’s Associated with Common Table Expressions (CTE) – Quiz – Puzzle – 26 of 31 « SQL Server Journey with SQL Authority

Fri, 27 Jan 2012 01:31:23 +0000

[...] (CTE) and Few Observation Multiple CTE in One SELECT Statement Query Delete Duplicate Rows Simple Example of Recursive CTE SQL SERVER – Simple Example of Recursive CTE – Part 2 – MAXRECURSION – Prevent CTE Infinite [...]

By: sam

sam — Tue, 27 Dec 2011 18:18:01 +0000

Please help me in this.. i have written cte but facing problem in achieving my desired output:
organizationtable:
oid, orgname, level, parentid
10-unit1-1-0
11-dept1-2-10
12-dept2-2-10
13-sec1-3-11
empdtls:
eid staffno oid
1-99-13

cte which i have writted is below:
with testorg as(
select oid,orgname,parentid from #organizationdtls where parentid = 0
union all
select a.oid,a.orgname,a.parentid from #organizationdtls a inner join testorg t on(a.parentid = t.oid)
)
select t.* from testorg t

Help me in achieving such output if i pass oid = 10 then it should return
empdtls:
eid staffno oid
1-99-13

Please help me !!

By: diksta33

diksta33 — Mon, 12 Dec 2011 16:06:23 +0000

Then I thought you probably want the child with the id = 6 to come after its parent in the list, i.e. 1, 4, 6, 5, 2, 7, 8, 3.

This will work for three levels (same table variable as before):

WITH cte AS (
SELECT
idConcept,
idParentConcept,
NULL AS ParentParent,
[Description]
FROM
@Temp
WHERE
idParentConcept IS NULL
UNION ALL
SELECT
t.idConcept,
t.idParentConcept,
cte.idParentConcept,
t.[Description]
FROM
@Temp t
INNER JOIN cte ON t.idParentConcept = cte.idConcept)
SELECT
idConcept,
idParentConcept,
[Description]
FROM
cte
ORDER BY
COALESCE(ParentParent, idParentConcept, idConcept),
CASE WHEN ParentParent IS NULL THEN idConcept ELSE idParentConcept END,
idConcept;

By: diksta33

diksta33 — Mon, 12 Dec 2011 15:45:29 +0000

Try this:

DECLARE @Temp TABLE (idConcept INT, idParentConcept INT, [Description] VARCHAR(50));
INSERT INTO @Temp VALUES (1, NULL, ‘Root Concept’);
INSERT INTO @Temp VALUES (2, NULL, ‘Root Concept’);
INSERT INTO @Temp VALUES (3, NULL, ‘Root Concept’);
INSERT INTO @Temp VALUES (4, 1, ‘Child Level 1′);
INSERT INTO @Temp VALUES (5, 1, ‘Child Level 1′);
INSERT INTO @Temp VALUES (6, 4, ‘Child Level 2′);
INSERT INTO @Temp VALUES (7, 2, ‘Child Level 1′);
INSERT INTO @Temp VALUES (8, 2, ‘Child Level 1′);

WITH cte AS (
SELECT
idConcept,
idParentConcept,
[Description]
FROM
@Temp
WHERE
idParentConcept IS NULL
UNION ALL
SELECT
t.idConcept,
t.idParentConcept,
t.[Description]
FROM
@Temp t
INNER JOIN cte ON t.idParentConcept = cte.idConcept
)
SELECT
c1.*
FROM
cte c1
LEFT JOIN cte c2 ON c2.idConcept = c1.idParentConcept
LEFT JOIN cte c3 ON c3.idConcept = c2.idParentConcept
ORDER BY
COALESCE(c3.idConcept, c2.idConcept, c1.idConcept),
COALESCE(c2.idConcept, c1.idConcept),
c1.idConcept;

–idConcept idParentConcept Description
–1 NULL Root Concept
–4 1 Child Level 1
–5 1 Child Level 1
–6 4 Child Level 2
–2 NULL Root Concept
–7 2 Child Level 1
–8 2 Child Level 1
–3 NULL Root Concept

By: nilesh

nilesh — Mon, 12 Dec 2011 14:29:36 +0000

i also have same problem. i too need the solution for same problem. using order by it is successful til 2nd level. please provide me the solution for same.

By: jatin chawla

jatin chawla — Wed, 07 Dec 2011 04:45:09 +0000

Very usefull thanks..

By: Pooja

Pooja — Mon, 21 Nov 2011 11:58:31 +0000

hey i want a solution. please help.
i have a table with these columns
ID GroupName ParentId
1 / 0
2 a 1
3 b 2
4 a1 1
5 b2 4

and I want a output like

Groupname
/
/a
/a/b
/a1
/a1/b1

please help me asap.

By: ram

ram — Wed, 02 Nov 2011 03:40:11 +0000

hi Ravi/ Sathya
I am looking for the same output. can you please help me out with this query?

By: Abhishek

Abhishek — Thu, 25 Aug 2011 18:49:12 +0000

I have a transaction table: Tran

Table Structure: Applid, SalesAmount, EmpId

I have an employee table: Employee

Table Structure: EmpId, EmpRole, ManagerId

Employee table can have 4 emp roles: A, B, C, D (D is the highest role, A is the lowest role)

The employee Id in Tran table (EmpId) can have employees with role A, B, C or D. Send me a query which would show the sum of SalesAmount for the employees at role D.

Tran Table:
Applid SalesAmount EmpID
1 1000 1001
2 2000 1002
3 3000 1003
4 4000 1004
5 5000 1005
6 6000 1006
7 7000 1007
8 8000 1008
9 9000 1009
10 10000 1001

Employee:
EmpID Role ManagerId
1001 A 1002
1002 B 1003
1003 C 1005
1004 A 1002
1005 D —-
1006 A 1007
1007 B 1010
1008 B 1010
1010 C 1009
1009 D —-

Desired output:
EmployeeID TotalSalesAmount
1005 25000
1009 30000

By: Gautam Kansal

Gautam Kansal — Sun, 31 Jul 2011 08:07:53 +0000

Hi,

I have a table with below data
Column A Column B
1 101
1 102
2 103
2 104
3 105
3 106

I need a result set as follows

101, 103, 105
101, 103, 106
101, 104, 105
101, 104, 106
102, 103, 105
102, 103, 106
102, 104, 105
102, 104, 106

Can you please help me how to get the above result using CTE

By: Will

Will — Thu, 28 Jul 2011 18:06:53 +0000

The CTE works well, but doesn’t give the order I need. The problem I have is that I want to order the records as follows:

CEO
Bob – Reports to CEO
Joe – Reports to Bob
Mike – Reports to Joe
May – Reports to Bob
Andy – Reports to CEO
Tom – Reports to Andy

The spaces are for clarity

This is the code I am using at the moment:

WITH GroupReports (GroupID, ReportsTo, GroupName, MemberID, Level)
AS
(
– Anchor member definition
SELECT e.GroupID, e.ReportsTo, e.GroupName, e.MemberID,
0 AS Level
FROM dbo.Groups AS e
WHERE e.ReportsTo IS NULL AND e.MemberID = @GroupID
UNION ALL
– Recursive member definition
SELECT e.GroupID, e.ReportsTo, e.GroupName, e.MemberID,
Level + 1
FROM Groups e
INNER JOIN GroupReports d
–ON e.GroupID = d.ReportsTo
–ON e.ReportsTo = d.ReportsTo
ON e.ReportsTo = d.GroupID
)
– Statement that executes the CTE
SELECT gr.GroupID, gr.ReportsTo, gr.GroupName, gr.MemberID, Level
FROM GroupReports gr

And this is how it returns the rows:

CEO
Bob – Reports to CEO
Andy – Reports to CEO
May – Reports to Bob
Joe – Reports to Bob
Tom – Reports to Andy
Mike – Reports to Joe

It looks like all level one are selected, then all level two’s and so on. That is not what I want. I need to have them grouped by ‘Reports To’.

Any help on this one would be much appreciated.

By: Roshni

Roshni — Tue, 19 Jul 2011 07:25:25 +0000

Hello Pinal,

My Table Contains Such Type of Record
ID Name ParentID
1 Item 1 NULL
2 Item 2 NULL
3 Cate 1 1
4 Cate 2 2
5 Cate 3 1
6 Cate 4 1
7 Cate 5 1
8 Cate 6 2
…… so on …. may be there is possibility of child of Cate 1, Cate 2….

Actually using CTE, It will Give me Output Like this :
ID Name ParentID
1 Item 1 NULL
2 Item 2 NULL
4 Cate 2 2
8 Cate 6 2
3 Cate 1 1
5 Cate 3 1
6 Cate 4 1
7 Cate 5 1

But I want OutPut Like this :
ID Name ParentID
1 Item 1 NULL
3 Cate 1 1
5 Cate 3 1
6 Cate 4 1
7 Cate 5 1
2 Item 2 NULL
4 Cate 2 2
8 Cate 6 2

How can I get Such Type of Output ??…. Please Help me …

By: SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Day 15 of 31 Journey to SQLAuthority

Fri, 15 Jul 2011 01:31:29 +0000

[...] CTE is the abbreviation for Common Table Expression. A CTE is an expression that can be thought of as a temporary result set which is defined within the execution of a single SQL statement. A CTE is similar to a derived table in that it is not stored as an object and lasts only for the duration of the query. (Read more here) [...]

By: Ilan

Ilan — Mon, 27 Jun 2011 14:02:21 +0000

is there a way to avoid a loop (nocycle for those of you who know oracle plsql) using cte?

By: ravi

ravi — Sat, 28 May 2011 13:03:04 +0000

hi satya,

i’m trying this code.but it shows an error i think it not works .will u check it and send me clearly

thanks,
ravi

By: tynicool

tynicool — Fri, 27 May 2011 22:25:06 +0000

Sorry for my english,

How can I use CTE in SSAS ,creating a named query on a DSV?

By: satish

satish — Thu, 19 May 2011 06:20:44 +0000

Thank you so much, It is very useful.

By: Manish

Manish — Wed, 18 May 2011 07:51:25 +0000

Hi all,

I am having a temptable with 100 names in it, and I want to execute a SP with all the 100 names as the parameters of the temptable and the output of the SP I want to store in another temp table say(XtempTable).

Can I achieve this using CTE. if yes..
Please advice how can I go with that using CTE.

Thanks
Manish

By: SQL SERVER – Common Table Expression (CTE) and Few Observation Journey to SQLAuthority

Tue, 10 May 2011 02:16:59 +0000

[...] SQL SERVER – Simple Example of Recursive CTE [...]

By: jx

jx — Mon, 31 Jan 2011 13:26:37 +0000

would it be possible to query the managers for
9 Dodsworth 5?
e.g. it would return
2 Fuller Null
5 Buchanan 2

because Buchanan is his direct superier, and Fuller is Buchanans superior?

By: jx

jx — Mon, 31 Jan 2011 13:25:04 +0000

Thanks for the link,
THe resulting dataset is
2 Fuller NULL
1 Davolio 2
3 Leverling 2
4 Peacock 2
5 Buchanan 2
8 Callahan 2
6 Suyama 5
7 King 5
9 Dodsworth 5

By: Richard Hansell

Richard Hansell — Mon, 24 Jan 2011 16:25:29 +0000

Yes, this query is pretty useless in this form. All it does is list out the contents of the table in the “right” order. However, we can easily “fix” it to make it much more useful:

WITH Emp_CTE AS (
SELECT EmployeeID, ManagerID, Title, 0 AS Depth
FROM HumanResources.Employee
WHERE ManagerID IS NULL
UNION ALL
SELECT e.EmployeeID, e.ManagerID, e.Title, ecte.Depth + 1 AS Depth
FROM HumanResources.Employee e
INNER JOIN Emp_CTE ecte ON ecte.EmployeeID = e.ManagerID
)
SELECT *
FROM Emp_CTE

All I am doing is adding a little contextual information to the query and removing some of the junk we don’t really need. I hope the syntax is right as I don’t have a copy of the old AdventureWorks database to test it!