On Thu, Jan 12, 2006 at 07:51:22PM +0100, Ott? Havasv?lgyi wrote: > Hi, > > If the join is to a primary key or notnull unique column(s), then > inner join is also ok. But of course left join is the simpler case. > An example: Actually, you need both the unique/pk constraint, and RI (a fact I missed in the email I just sent). Nullability is another consideration as well. But there certainly are some pretty common cases that can be optimized for. -- Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
