Comments on: Cool Undocumented OVERLAPS Predicate

By: Eddie Awad

Eddie Awad — Fri, 13 Jun 2008 19:15:44 +0000

@Laurent: I’m assuming that the WM_OVERLAPS needs the Workspace Manager to be installed/enabled.

@John: OVERLAP_CNT seems useful. Feel free to share the link to the code on your website.

By: John Flack

John Flack — Fri, 13 Jun 2008 12:09:37 +0000

For many years I have had an OVERLAP_CNT(start_date1 date, end_date1 date, start_date2 date, end_date2 date) function in my CMP package, which is available on my website. This returns a 1 if the date range represented by the first two dates overlaps the date range represented by the second two dates, and a 0 if it does not. This allows you to use it in a sum() to count how many rows have an overlapping date range, or a where clause.

By: Laurent Schneider

Laurent Schneider — Fri, 13 Jun 2008 05:49:12 +0000

WM_OVERLAPS is documented

SELECT *
FROM dual
WHERE WM_OVERLAPS(WM_PERIOD(add_months(sysdate, -6), DATE ‘2008-08-08′),
WM_PERIOD(sysdate - 180, sysdate+180))=1;