Обсуждение: retrieve row number
<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>
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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