On Mon, 21 Nov 2005 16:19:28 -0500 Tom Lane <[EMAIL PROTECTED]> threw this fish to the penguins:
> george young <gry@ll.mit.edu> writes: > > update steps set x=x||'X' from steps s where steps.key1=s.key1 and > > steps.key2=s.key2 and step.ctid<s.ctid; > > > But this fails because there is no less-than operator (or function) on > > type "tid". > > Probably a good thing, too, since if there was it wouldn't have anything > reliable to do with the age of the tuple. Well, I don't have any need for it to correlate with the age of the tuple. My use of step.ctid<s.ctid was not to get the earliest or latest row, but just to *choose* one. Perhaps there's some other query that would modify only one of each pair of equal-keyed rows? -- George -- "Are the gods not just?" "Oh no, child. What would become of us if they were?" (CSL) ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
