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<p class="MsoNormal"><a name="T_Default_Reply"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi!<o:p></o:p></span></a></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’ve used something like this to get unique Ids:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">SELECT row_number() OVER (ORDER BY s.omrade_id, s.kod) AS id, …. ORDER BY s.omrade_id, s.kod;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If the ordering isn’t necessary I guess you can skip that.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="https://www.postgresql.org/docs/current/static/functions-window.html"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">https://www.postgresql.org/docs/current/static/functions-window.html</span></a><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black">Karl-Magnus Jönsson</span></b><span style="font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Från:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Qgis-user [mailto:qgis-user-bounces@lists.osgeo.org]
<b>För </b>Árni Geirsson<br>
<b>Skickat:</b> den 12 april 2017 11:34<br>
<b>Till:</b> qgis-user@lists.osgeo.org<br>
<b>Ämne:</b> [Qgis-user] Unique IDs in a PostGIS view<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am trying to create a view that extracts vertices from lines using ST_DumpPoints and to get unique IDs I have set up a sequence to generate the numbers using nextval(). The query executes normally in the DB Mananger and I see the results
as a table in the table view. However, when I attempt to load the results of the view as a layer in QGIS, I get an error: "Database error: ERROR: cannot execute nextval() in a read-only transaction". No features are loaded.<o:p></o:p></p>
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<p class="MsoNormal">Are there any smart tricks out there to work around this or other means of generating the IDs?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:black">Árni Geirsson</span><o:p></o:p></p>
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