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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Try<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Select * from companies where company_id not in (select distinct company_id from todos) and company_id not in (select distinct...) etc.<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Haven’t tried it, but it should work.<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">YMMV etc.<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">A.<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"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Andy Cowan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">OpenSense Ltd<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>
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color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> phpwm-bounces@mailman.lug.org.uk
[mailto:phpwm-bounces@mailman.lug.org.uk] <b>On Behalf Of </b>Daniel Davies<br>
<b>Sent:</b> 03 April 2008 15:58<br>
<b>To:</b> West Midlands PHP User Group<br>
<b>Subject:</b> [Phpwm] SQL Problem<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hello all,<br>
<br>
Sorry, this is not strictly PHP, but its all the same kettle of fish.<br>
<br>
I'm working on a system that has companies, and these companies can have activities and todos, defined something like:<br>
<br>
companies { <u>company_id</u>, name, etc... }<br>
todos { <u>todo_id</u>, <i>company_id</i>, etc... }<br>
activities { <u>activity_id</u>, <i>company_id</i>, etc... }<br>
<br>
I'm trying to write a query which will only return companies that do NOT have an activity or a todo in one query - my mind is blank! Maybe my brain has been rotted by this system, but I can't think of a nice simple way to do it. Any ideas? I've had some thoughts
about using count, but I'd like to check I'm not missing a simple solution before I start writing elaborate queries.<br>
<br>
Regards,<br>
<br>
Daniel<o:p></o:p></p>
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