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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m encountering an incredibly slow run time when I attempt to create a new table (CREATE TABLE AS) with fields populated by calculations which reference two other tables. Does referencing multiple tables in a calculation like this usually result in a slower run time?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Here is a portion of my script:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>CREATE TABLE public.sac_parcel_emp_unemp_calc_062311 AS<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> SELECT<o:p></o:p></p><p class=MsoNormal> a.id_parcel, a.vc_pop, a.pop_age16_up,<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> CASE<o:p></o:p></p><p class=MsoNormal> WHEN b.p043001 > 0<o:p></o:p></p><p class=MsoNormal> THEN (a.pop_age16_up * (cast(b.p043004 as float) + b.p043006 + b.p043011 + b.p043013) / b.p043001)<o:p></o:p></p><p class=MsoNormal> ELSE 0 <o:p></o:p></p><p class=MsoNormal> END as pop_employed<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>FROM public.sac_parcel_age16_up as a, public.sac_parcel_block_bg_test_062011 as b;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I also cast one of the variables in the calculation as a float so that the output field would be the same and not populated with zeros. <o:p></o:p></p><p class=MsoNormal>Thanks for any help.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:gray'>Conor Henley<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:gray'>GIS/Regional Planning Intern<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:gray'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#CC6600'>C A L T H O R P E</span></b><b><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:gray'> A S S O C I A T E S</span></b><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:gray'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:gray'>2095 ROSE STREET, SUITE 201, BERKELEY, CALIFORNIA, 94709 USA<br>510-548-6800 | 510 548-6848 (fax)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:gray'><a href="mailto:sheara@calthorpe.com"><span style='color:blue'>conor@calthorpe.com</span></a> | <a href="www.calthorpe.com"><span style='color:blue'>www.calthorpe.com</span></a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>