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How to write Query on the Result Set of Another Query


How to write Query on the Result Set of Another Query

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perireddy.arikatla
perireddy.arikatla
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Hai Every One. Can Any body help me Please.


I Want to Write a Query On the Result Set Of Another Query.

How to Write
Can Any body help me Please.
Koen Verbeeck
Koen Verbeeck
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You mean something like this:


SELECT * FROM
(SELECT * FROM myTable WHERE col = 'A') tmp;



Subquery Fundamentals



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lrosini
lrosini
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Maybe something like this

with cte (ID, somefield) as
(
   select ID, FieldName from TableA
)

select TableB.Field
from TableB
join cte
on cte.ID = TableB.ID
Jeff Moden
Jeff Moden
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perireddy.arikatla (10/10/2013)


Hai Every One. Can Any body help me Please.


I Want to Write a Query On the Result Set Of Another Query.

How to Write
Can Any body help me Please.



There are a lot of ways to do this. Koen's code demonstrates a "Derived Table". There are other methods, as well.

CTE
Derived Tables (Sub-queries)
Correlated Sub-Queries
Views
Inline Table Valued Functions
APPLY (CROSS or OUTER)
Temp Tables
INSERT/EXEC
OpenRowSet
OpenDataSource

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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lrosini
lrosini
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As Jeff showed there are many ways to do this. I only provided one possibility.

I've been a silent observer on this site for along time and finally feel that I have some knowledge to begin offering solutions to some questions. :-)
Jeff Moden
Jeff Moden
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lrosini (10/11/2013)
As Jeff showed there are many ways to do this. I only provided one possibility.

I've been a silent observer on this site for along time and finally feel that I have some knowledge to begin offering solutions to some questions. :-)


Ver y cool. Welcome to the fun. :-)

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
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