On fös, 2007-07-20 at 11:08 -0400, Chris Hoover wrote: > I need some help. I am trying to replicate a function from Sybase > ASA, and am having difficulty. > > I need to be able to subtract 2 date (or timestamps) and return the > results expressed in days, weeks, month, quarters, or years. How do I > do this? > > I believe Postgres is returning the number of days when you subtract > to days. > > However, I can not figure out how to get the results expressed as 7 > months, would not 6 months be more logical? > or 2 quarters, x weeks, or 0 years. have you tried to use extract() ? there is an old compatibility project on pgfoundry that has a datediff function, but i have no idea how well it copies the mssql behaviour. http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/mssqlsupport/datetimefunctions.sql?rev=1.1.1.1&content-type=text/x-cvsweb-markup it looks a bit simplistic to me, but maybe that is exactly what you need. gnari
