=?iso-8859-2?Q?Egy=FCd_Csaba?= <csegyud@xxxxxxx> writes: > E.g. I have four dates (D1, D2, D3, D4) and I want to know if (D1,D2) > intersects (D3,D4) or not. See the OVERLAPS operator: ( start1, end1 ) OVERLAPS ( start2, end2 ) http://developer.postgresql.org/docs/postgres/functions-datetime.html regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend