Re: sequence number in a result

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 -----
From: Campbell, Lance
To: pgsql-sql(at)postgresql(dot)org
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