How to Write Query for This

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How to Write Query for This

perireddy.arikatla

SSC Enthusiast

Points: 113
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September 19, 2013 at 3:58 am

#297942

i want to write a query to get data of two different columns with two different conditions from a single table.
How
Can anybody please Help me Out.

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michal.lisinski SSCertifiable Points: 6933 More actions · Answer 1

Hi

I'm not sure what you are looking for, but try this:

SELECT t1.Col1,t2.Col2

FROM SomeTable As t1 CROSS JOIN

SomeTable AS t2

WHERE (t1.Colx = 'Your_condition') AND (t2.Coly = 'Your_next_condition')

Br.

Mike

Jack Corbett SSC Guru Points: 184394 More actions · Answer 2

If you were to share the DDL for the table (or an example) and the conditions you want it would it easier to help you out.

Michal has shared one possible solution for one interpretation of your question. I'd do something like this:

Select col1, col2 from table1 where col3 = 1 or col4 = 1;

I actually interpreted your question to mean that for one condition you wanted to return one column and for another condition a different column like this:

Select CASE WHEN col3 = 1 then col1 ELSE col2 END as returnedData FROM table 1;

Jack Corbett
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Dwain Camps SSC Guru Points: 86948 More actions · Answer 3

Something like this perhaps?

WITH SampleData ([Key], Col1, Col2) AS (

SELECT 1, 'ABC', 'DEF'

UNION ALL SELECT 2, 'GFI', 'XYZ')

SELECT Col1=MAX(CASE WHEN [Key]=Key1 THEN a.Col1 END)

,Col2=MAX(CASE WHEN [Key]=Key2 THEN a.Col2 END )

FROM SampleData a

CROSS APPLY (SELECT 1, 2) b([Key1], [Key2])

WHERE [Key] IN ([Key1], [Key2]);

My mantra: No loops! No CURSORs! No RBAR! Hoo-uh![/I]
My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.

Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St