How to solve this?

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Home » SQL Server 7,2000 » T-SQL » How to solve this?

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How to solve this?

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Posted Wednesday, January 30, 2008 2:37 PM

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I have this query

select distinct p.first_name
,p.last_name
,'class level' = case when a.credits + t.earned_credits between 1 and 32 and a.program ='ft'then 'F1'
when a.credits + t.earned_credits between 33 and 61 and a.program ='ft' then 'F2'
when a.credits + t.earned_credits >= 62 and a.program ='ft'then 'F3'
when a.credits + t.earned_credits between 1 and 25 and a.program ='pt'then 'P1'
when a.credits + t.earned_credits between 26 and 47 and a.program ='pt'then 'P2'
when a.credits + t.earned_credits between 48 and 70 and a.program ='pt'then 'P3'
when a.credits + t.earned_credits >= 71 and a.program ='pt'then 'P4'
end
from people as p
inner join academic as a
on p.people_code_id=a.people_code_id
inner join transcriptgpa as t
on p.people_code_id=t.people_code_id
where t.record_type='O'
and a.academic_term='Spring'
and a.academic_year='2008'
and t.academic_term='Fall'
and t.academic_year='2007'
and a.enroll_separation ='enrl'
and a.academic_session='main'
and (a.program ='ft' or a.program='pt')
order by 'class level', p.first_name

Which is correct, BUT, not everyone has data in the transcriptgpa table, for fall 2007 but, i still need to pull them based on their a.credits. if they dont have anything in the transcriptgpa table for fall 2007. How can i do this?

Post #449707

Posted Wednesday, January 30, 2008 2:39 PM

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LEFT join transcriptgpa

And move
t.record_type='O'
and t.academic_term='Fall'
and t.academic_year='2007'
from "WHERE" to "ON"

Post #449709

Posted Wednesday, January 30, 2008 5:02 PM

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Can you clarify? Im not sure how to move them to the on line. The joins confuses me? Can you write an example?

Post #449751

Posted Wednesday, January 30, 2008 5:20 PM

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...
left join transcriptgpa as t on 
		p.people_code_id=t.people_code_id
	and t.record_type='O'
	and t.academic_term='Fall'
	and t.academic_year='2007'
where a.academic_term='Spring'
	and a.academic_year='2008'
	and a.enroll_separation ='enrl'
	and a.academic_session='main'
	and (a.program ='ft' or a.program='pt')

Post #449757

Posted Wednesday, January 30, 2008 5:25 PM

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Thanks!! It worked. Now i see the people who were previosuly missing. Ive never seen a join created like this, can you explain how exactly this is working? Im looking at it, and its just not jumping out yet. I really appreciate the help btw.

Post #449760

Posted Wednesday, January 30, 2008 5:35 PM

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After further review it looks like that by adding those as a left outer join by using
on p.people_code_id=t.people_code_id
and t.record_type='O'
and t.academic_term='Fall'
and t.academic_year='2007'

its pulling IF they have a fall 2007 "o" record. If not, its just pulling their people record and using the data contained in the academic table for my case calulations, using the rest of the where clause? So my Case statement is seeing nothing in the transcriptgpa table, then using the rest of the where clause for definition. Am i close?

*edit*

I also notice now the people who are appearing are showing a class level of "null". Probably because they dont have any data in the transcriptgpa table, is their any way to use only the values in the acadmic table IF, they dont have data in the transcriptgpa table? Does this make sense?

Post #449761

Posted Wednesday, January 30, 2008 5:59 PM

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Add IsNull() or Coalesce() around the transcription credits, like this:

select distinct p.first_name
,p.last_name
,'class level' = case when a.credits + t.earned_credits between 1 and 32 and a.program ='ft'then 'F1'
when a.credits + isnull(t.earned_credits, 0) between 33 and 61 and a.program ='ft' then 'F2'
when a.credits + isnull(t.earned_credits, 0) >= 62 and a.program ='ft'then 'F3'
when a.credits + isnull(t.earned_credits, 0) between 1 and 25 and a.program ='pt'then 'P1'
when a.credits + isnull(t.earned_credits, 0) between 26 and 47 and a.program ='pt'then 'P2'
when a.credits + isnull(t.earned_credits, 0) between 48 and 70 and a.program ='pt'then 'P3'
when a.credits + isnull(t.earned_credits, 0) >= 71 and a.program ='pt'then 'P4'
end
..........etc

Post #449765

Posted Thursday, January 31, 2008 10:17 AM

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One more thing i need to add...On their transcript gpa record, when it is pulling t.earned credits, their is also a trans seq number of either 001 or 002. Not everyone has a 002 record, BUT, if they do i need to use that record, if they dont have a trans seq of 002, then i need to use their 001 record. Is it possible to incoporate this into my code? This is what i have thus far, which is pulling everyone correctly, BUT, some people are appearing twice because they have both a trans seq 001 and 002 record, it should only be pulling their 002 record if they have it, if not, then 001.

select distinct p.first_name
,p.last_name
,'class level' = case when a.credits + isnull(t.earned_credits,0) between 1 and 32 and a.program ='ft'then 'F1' when a.credits + isnull(t.earned_credits, 0) between 33 and 61 and a.program ='ft' then 'F2'when a.credits + isnull(t.earned_credits, 0) >= 62 and a.program ='ft'then 'F3' when a.credits + isnull(t.earned_credits, 0) between 1 and 25 and a.program ='pt'then 'P1'
when a.credits + isnull(t.earned_credits, 0) between 26 and 47 and a.program ='pt'then 'P2'
when a.credits + isnull(t.earned_credits, 0) between 48 and 70 and a.program ='pt'then 'P3'
when a.credits + isnull(t.earned_credits, 0) >= 71 and a.program ='pt'then 'P4'
end
from people as p
inner join academic as a
on p.people_code_id=a.people_code_id
left outer join transcriptgpa as t
on p.people_code_id=t.people_code_id
and t.record_type='O' and t.academic_term='Fall'--records in the transcript gpa table
and t.academic_year='2007'
where a.academic_term='Spring'
and a.academic_year='2008'
and a.enroll_separation ='enrl'
and a.academic_session='main'
and (a.program ='ft' or a.program='pt')
order by 'class level'

Post #450071

Posted Friday, February 01, 2008 8:48 AM

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still looking for an answer to the trans seq question, anyone?

Post #450556

Posted Friday, February 01, 2008 10:26 AM

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-- One way is to join the transcript table twice and switch from isNull() to coalesce().
select distinct
p.first_name
,p.last_name
,'class level' = case
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) between 1 and 32 and a.program ='ft'then 'F1'
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) between 33 and 61 and a.program ='ft' then 'F2'
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) >= 62 and a.program ='ft'then 'F3'
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) between 1 and 25 and a.program ='pt'then 'P1'
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) between 26 and 47 and a.program ='pt'then 'P2'
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) between 48 and 70 and a.program ='pt'then 'P3'
when a.credits + coalesce(t2.earned_credits, t1.earned_credits, 0) >= 71 and a.program ='pt'then 'P4'
end
from people as p
inner join academic as a
on p.people_code_id=a.people_code_id

left outer join transcriptgpa as t2
on p.people_code_id=t2.people_code_id
and t2.record_type='O'
and t2.academic_term='Fall'
and t2.academic_year='2007'
and t2.seqno = '002'

left outer join transcriptgpa as t1
on p.people_code_id=t1.people_code_id
and t1.record_type='O'
and t1.academic_term='Fall'
and t1.academic_year='2007'
and t1.seqno = '001'

where a.academic_term='Spring'
and a.academic_year='2008'
and a.enroll_separation ='enrl'
and a.academic_session='main'
and (a.program ='ft' or a.program='pt')
order by 'class level'

Post #450635

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