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Thread: retrieve row number

retrieve row number

From
"Pascal Tufenkji"
Date:
<div class="Section1"><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana">Hi,</span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana">Can I retrieve the row number in a select statement? </span></font><p class="MsoNormal"><font
face="Verdana"size="2"><span style="font-size:10.0pt; 
font-family:Verdana">For example : if I have the following table “foo”</span></font><p class="MsoNormal"><font
face="Verdana"size="2"><span style="font-size:10.0pt; 
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Courier" size="2"><span style="font-size:10.0pt;
font-family:Courier">col1 | col2</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier">-----+-----</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier"> a   | x</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier"> b   | y</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier"> c   | z</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier"> </span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana">select ?? as row_number, col1, col2 from foo;</span></font><p class="MsoNormal"><font
face="Verdana"size="2"><span style="font-size:10.0pt; 
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana">I should obtain the following result :</span></font><p class="MsoNormal"><font face="Verdana"
size="2"><spanstyle="font-size:10.0pt; 
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Courier" size="2"><span style="font-size:10.0pt;
font-family:Courier">row_number | col1 | col2</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier">-----------+------+-----</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier">         1 | a   | x</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier">         2 | b   | y</span></font><p class="MsoNormal"><font face="Courier" size="2"><span
style="font-size:10.0pt;
font-family:Courier">         3 | c   | z</span></font><p class="MsoNormal"><font face="Verdana" size="2"><span
style="font-size:10.0pt;
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana"> </span></font><p class="MsoNormal"><font face="Verdana" size="2"><span style="font-size:10.0pt;
font-family:Verdana">Thank you</span></font><p class="MsoNormal"><font face="Verdana" size="2"><span
style="font-size:10.0pt;
font-family:Verdana">Pascal</span></font></div>

Re: retrieve row number

From
"A. Kretschmer"
Date:
am  Fri, dem 01.12.2006, um  8:31:41 +0200 mailte Pascal Tufenkji folgendes:
> Hi,
> 
>  
> 
> Can I retrieve the row number in a select statement?
> For example : if I have the following table ?foo?
> I should obtain the following result :
> 
>  
> 
> row_number | col1 | col2
> -----------+------+-----
>          1 | a   | x
>          2 | b   | y
>          3 | c   | z


test=> create temporary sequence tmp_seq;
CREATE SEQUENCE
test=*> select nextval('tmp_seq') as row_number, col1, col2 from foo;row_number | col1 | col2
------------+------+------         1 | a    | x         2 | b    | y         3 | c    | z
(3 rows)


-- 
Andreas Kretschmer
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