Re: sequence number in a result

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От Oliveiros Cristina
Тема Re: sequence number in a result
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Msg-id 06a401c92a2e$ca6d4230$ec5a3d0a@marktestcr.marktest.pt
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Ответ на sequence number in a result  ("Campbell, Lance" <lance@illinois.edu>)
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Howdy, Lance.
 
I had that problem about a year ago, and AFAIK there is no solution, at least not in SQL Standard.
 
What I did was something like
 
SELECT a,b,c,count(y.a) as order
FROM t1 x , t1 y
WHERE  ((x.a >  y.a)
OR (x.a = y.a
AND x.ID <= y.ID))   -- Use here whatever you have as primary key on your table...
GROUP BY x.a,x.b,x.c ;
ORDER BY a ;
 
But this trick is just for relatively small tables.
When I needed something for bigger tables, I did it programmatically
 
But, maybe PostGreSQL has some proprietary function which I dunno that can do precisely this...
 
HTH a little...
 
Best,
Oliveiros 

"(SELECT resumo1.\"iPages\",resumo1.\"iUniqueVisitors\",resumo1.\"IDSite\",resumo1.\"IDWeboramaAccount\",resumo1.\"Visits\", " +

"COUNT(resumo2.\"iPages\") as rank " +

"FROM " + m_strSUBQUERY_INTERFACE + " resumo1," +

" " + m_strSUBQUERY_INTERFACE + " resumo2 " +

"WHERE ((resumo1.\"dtDate\" = @diadehoje) " +

"AND (resumo2.\"dtDate\" = @diadehoje)) " +

"AND ((resumo1.\"iPages\" < resumo2.\"iPages\" ) " +

"OR (resumo1.\"iPages\" = resumo2.\"iPages\" " +

"AND resumo1.\"IDSiteResume\" <= resumo2.\"IDSiteResume\")) " + // Tinha e tem IDSiteResume

"GROUP BY resumo1.\"iPages\",resumo1.\"iUniqueVisitors\"," +

"resumo1.\"IDSite\",resumo1.\"dtDate\",resumo1.\"IDSiteResume\",resumo1.\"IDWeboramaAccount\",resumo1.\"Visits\"

 
----- Original Message -----
Sent: Thursday, October 09, 2008 5:31 PM
Subject: [SQL] sequence number in a result

Say I have the following SQL statement:

 

SELECT a, b, c FROM t1 ORDER BY a;

 

Is there a function or special system label I can use that would generate a sequence number in the returning result set?

 

Example:

SELECT a, b, c, SOMELABEL as order FROM t1 ORDER BY a;

 

Result:

a    b     c   order

---------------------

Aa  bb  cc  1

A1  bb  cc  2

A2  bb  cc  3

 

Thanks,

 

Lance Campbell

Project Manager/Software Architect

Web Services at Public Affairs

University of Illinois

217.333.0382

http://webservices.uiuc.edu

 

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