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join two resultsets in sql server

Posted on 2010-11-18
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Medium Priority
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Last Modified: 2012-05-10
I have two resultsets I want to join.  But im not sure the easiest and best way.

Here are both queries:


SELECT     TOP (1) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
FROM         vw_Events
WHERE     (Highlight = 'Yes' and Priority = 'Yes')
ORDER BY StartDate

SELECT     TOP (2) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
FROM         vw_Events
WHERE     (Highlight = 'Yes' and Priority = 'NO')
ORDER BY StartDate
0
Comment
Question by:rochestermn
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7 Comments
 
LVL 29

Expert Comment

by:sammySeltzer
ID: 34167826
Try UNION:

SELECT     TOP (1) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
FROM         vw_Events
WHERE     (Highlight = 'Yes' and Priority = 'Yes')
ORDER BY StartDate
UNION
SELECT     TOP (2) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
FROM         vw_Events
WHERE     (Highlight = 'Yes' and Priority = 'NO')
ORDER BY StartDate 

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0
 
LVL 41

Expert Comment

by:ralmada
ID: 34167837
what do you mean by "join". Do you mean merge? then use UNION ALL like below
SELECT     TOP (1) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
FROM         vw_Events
WHERE     (Highlight = 'Yes' and Priority = 'Yes')
union all
SELECT     TOP (2) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
FROM         vw_Events
WHERE     (Highlight = 'Yes' and Priority = 'NO')
ORDER BY StartDate

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0
 
LVL 41

Expert Comment

by:ralmada
ID: 34167895
Actually try
select * from (
	SELECT     TOP 1 EventID,EventDescription,StartDate,EndDate,Highlight, Priority
	FROM         vw_Events
	WHERE     (Highlight = 'Yes' and Priority = 'Yes')
	order by StartDate
) a
union all
select * from (
	SELECT     TOP 2 EventID,EventDescription,StartDate,EndDate,Highlight, Priority
	FROM         vw_Events
	WHERE     (Highlight = 'Yes' and Priority = 'NO')
	ORDER BY StartDate
) b

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0
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LVL 29

Expert Comment

by:sammySeltzer
ID: 34167929
Just in case you are wondering what the difference is between UNION and UNION ALL,

UNION ALL gives you everything including duplicates while UNION gives you an occurance of each record.

So, you choose based on your need but the solutions are there, I think.
0
 
LVL 2

Expert Comment

by:vasureddym
ID: 34188596
rochestermn, you can also try CTE to define (name) the two result set and do the union. something like below.



sammySeltzer: the difference between your code and ralmada's is not just the UNION vs UNION ALL. the ORDER BY clause cannot be directly used so. just an FYI.

with top1 as (
	SELECT     TOP (1) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
	FROM         vw_Events
	WHERE     (Highlight = 'Yes' and Priority = 'Yes')
	ORDER BY StartDate
)
,top2 as (
	SELECT     TOP (2) EventID,EventDescription,StartDate,EndDate,Highlight, Priority
	FROM         vw_Events
	WHERE     (Highlight = 'Yes' and Priority = 'NO')
	ORDER BY StartDate
) 
select * from top1
union all
select * from top2;

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0
 

Accepted Solution

by:
rochestermn earned 0 total points
ID: 34239610
I decided to go with a temp table.  It worked just fine.  Thanks for all the union suggestions though Im sure I will use them in the future.
0
 

Author Closing Comment

by:rochestermn
ID: 34276715
I dediced to use my own solution...a temporary table vs using union.
0

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