Very specific query

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Very specific query

branovuk

SSCommitted

Points: 1774
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June 20, 2013 at 10:07 am

#294895

Hello All,
I have no idea at all how to do next:
Table:
ID_____Type_____ Term
1_____Subject_____ sky
2 _____Next _____ earth
2 _____Subject_____video
3_____Test _______black
4_____Subject _____white
4_____ Subject _____paper
4 _____Forms _____ red
4_____Subject _____stone
5_____Test ________head
6 ____Subject _____ leg
6 ____Subject _____ water
Query should check Subject in Type field and in a case of COUNT(ID) = 1 (and Type = Subject), field Result will be Term.
In a case of COUNT(ID) > 1 (and Type = Subject), field Result will be Term + ',' + Term + ',' ... ',' + Term
From table above:
ID_____Result
1_____ Sky
2_____ video
4_____ white, paper, stone
6_____ leg, water
Any idea?
Thanks,
Brano

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Sean Lange SSC Guru Points: 286590 More actions · Answer 1

Take a look at this article.

http://www.sqlservercentral.com/articles/comma+separated+list/71700/[/url]

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Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

branovuk SSCommitted Points: 1774 More actions · Answer 2

branovuk

SSCommitted

Points: 1774

June 20, 2013 at 1:52 pm

#1626098

Thanks Sean, will do,

Brano

branovuk SSCommitted Points: 1774 More actions · Answer 3

The way they explained it actually worked.

The only (kinda strange) behavior is if you try to save as a view:

It will give you some error; After, view result is good.

Opening again the same view: it is missing first line - but still working!

Thanks ...

Sean Lange SSC Guru Points: 286590 More actions · Answer 4

This seems to work fine. There is no reason it should change just because it is in a view.

if OBJECT_ID('Something') is not null

drop table Something

GO

create table Something

(

ID int,

Type varchar(10),

Term varchar(10)

)

GO

insert Something

select 1, 'Subject', 'sky' union all

select 2, 'Next', 'earth' union all

select 2, 'Subject', 'video' union all

select 3, 'Test', 'black' union all

select 4, 'Subject', 'white' union all

select 4, 'Subject', 'paper' union all

select 4, 'Forms', 'red' union all

select 4, 'Subject', 'stone' union all

select 5, 'Test', 'head' union all

select 6, 'Subject', 'leg' union all

select 6, 'Subject', 'water'

GO

select * from Something

--here is the code not in a view

SELECT id,

Stuff((SELECT ', ' + Term

FROM Something s2

WHERE s1.id = s2.id

and s2.Type = 'Subject'

ORDER BY s2.Term

FOR XML PATH('')), 1, 1, '') as Result

FROM Something s1

where Type = 'Subject'

GROUP BY id

go

create view MyView as

SELECT id,

Stuff((SELECT ', ' + Term

FROM Something s2

WHERE s1.id = s2.id

and s2.Type = 'Subject'

ORDER BY s2.Term

FOR XML PATH('')), 1, 1, '') as Result

FROM Something s1

where Type = 'Subject'

GROUP BY id

go

select * from myview

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

super48 SSCrazy Points: 2682 More actions · Answer 5

how for xml path('') works here to get all values in single row?please explain

thanks and regards

sudarshan

kapil_kk SSC-Insane Points: 21316 More actions · Answer 6

Hi Sean,

I know to print comma seperated values using FOR XML.

But I was trying the same solution using COALESCE like this:

DECLARE @var varchar(max)

SELECT @var = coalesce(@var +',','') + term from Something where TYPE = 'subject'

select @var, ID from something

group by ID

its printing all term values in a single line... Can you please tell me what to modify in my script to get the same output as using FOR XML as you did

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/

kapil_kk SSC-Insane Points: 21316 More actions · Answer 7

you can do the same thing as Sean did using SUBSTRING also:

SELECT id,

SUBSTRING((SELECT ', ' + Term

FROM Something s2

WHERE s1.id = s2.id

and s2.Type = 'Subject'

ORDER BY s2.Term

FOR XML PATH('')), 2, 1000) as Result

FROM Something s1

where Type = 'Subject'

GROUP BY id

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/

Sean Lange SSC Guru Points: 286590 More actions · Answer 8

gurjer48 (6/26/2013)
how for xml path('') works here to get all values in single row?please explain
thanks and regards
sudarshan

Not quite sure what you are asking? Are you asking how does FOR XML work or are you asking how you get all values in a single row?

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

Sean Lange SSC Guru Points: 286590 More actions · Answer 9

kapil_kk (6/26/2013)
Hi Sean,
I know to print comma seperated values using FOR XML.
But I was trying the same solution using COALESCE like this:
DECLARE @var varchar(max)
SELECT @var = coalesce(@var +',','') + term from Something where TYPE = 'subject'
select @var, ID from something
group by ID
its printing all term values in a single line... Can you please tell me what to modify in my script to get the same output as using FOR XML as you did

No clue how you could do that Kapil. I think you would have to use a subquery to keep the ID in synch but then I don't have any idea how you would do it.

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

Sean Lange SSC Guru Points: 286590 More actions · Answer 10

kapil_kk (6/26/2013)
you can do the same thing as Sean did using SUBSTRING also:
SELECT id,
SUBSTRING((SELECT ', ' + Term
FROM Something s2
WHERE s1.id = s2.id
and s2.Type = 'Subject'
ORDER BY s2.Term
FOR XML PATH('')), 2, 1000) as Result
FROM Something s1
where Type = 'Subject'
GROUP BY id

The problem here is that you have to choose an arbitrary length. In your case it was 1000 which is plenty to cover the sample data. The issue can be demonstrated by changing the length to something shorter than the output you can see what happens.

Let's change the length to 10 instead 1000.

SELECT id,

Substring((SELECT ', ' + Term

FROM Something s2

WHERE s1.id = s2.id

AND s2.Type = 'Subject'

ORDER BY s2.Term

FOR XML PATH('')), 2, 10) AS Result

FROM Something s1

WHERE Type = 'Subject'

GROUP BY id

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

kapil_kk SSC-Insane Points: 21316 More actions · Answer 11

Sean Lange (6/26/2013)
kapil_kk (6/26/2013)
you can do the same thing as Sean did using SUBSTRING also:
SELECT id,
SUBSTRING((SELECT ', ' + Term
FROM Something s2
WHERE s1.id = s2.id
and s2.Type = 'Subject'
ORDER BY s2.Term
FOR XML PATH('')), 2, 1000) as Result
FROM Something s1
where Type = 'Subject'
GROUP BY id
The problem here is that you have to choose an arbitrary length. In your case it was 1000 which is plenty to cover the sample data. The issue can be demonstrated by changing the length to something shorter than the output you can see what happens.
Let's change the length to 10 instead 1000.
SELECT id,
Substring((SELECT ', ' + Term
FROM Something s2
WHERE s1.id = s2.id
AND s2.Type = 'Subject'
ORDER BY s2.Term
FOR XML PATH('')), 2, 10) AS Result
FROM Something s1
WHERE Type = 'Subject'
GROUP BY id

Yes, Sean changing length can arise problem...thanks for correcting that

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/