Query a Query

I have a result set in a query.
Is it possible to query this query?

(no specific SQL dialect, can it be done generically?)


1/20/2010 5:33:35 PM
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> I have a result set in a query.
> Is it possible to query this query?
> (no specific SQL dialect, can it be done generically?)

There is a generic answer to your question: Yes, there is a construct 
called a sub-query that allows you, in 1 SQL statement, to query from a 

But, generically speaking, not all DB engines support this construct. 
For instance, Firebird only added it just over a year ago.

Loren sZendre
1/20/2010 5:47:12 PM

> I have a result set in a query.
> Is it possible to query this query?
> (no specific SQL dialect, can it be done generically?)

The general syntax is 

  SELECT <fieldlist> FROM
     (SELECT <anotherfieldlist> FROM <tables, joins> WHERE <conditions>)
  WHERE <more conditions>

That is: you use the result set of one query as source for the next.
The columns in <anotherfieldlist> should have alias names, which you
can then use in the outer <fieldlist>. Not every database will support
that, even though it is part of the current ANSI SQL standard, as far
as I know.

Peter Below (TeamB)  
Don't be a vampire (http://slash7.com/pages/vampires), 
use the newsgroup archives :
1/20/2010 6:30:55 PM

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