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Oracle - Overlaps function

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This function can be used to find out if there exists an overlap between two pairs of dates or time.

There is an alternate way to calculate the actual overlapping value - Read the snippet "How to avoid double counts"

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  1. -- Overlap present
  2.  
  3. SELECT 'YES' AS overlap FROM dual
  4.     WHERE          (DATE '2007-01-01', DATE '2008-01-01')
  5.           overlaps (DATE '2005-01-01', DATE '2009-01-01')
  6.  
  7.  
  8. OVE
  9. ---
  10. YES
  11.  
  12. -- Overlap not present
  13.  
  14. SELECT 'YES' AS overlap FROM dual
  15.     WHERE          (DATE '2007-01-01', DATE '2008-01-01')
  16.           overlaps (DATE '2005-01-01', DATE '2006-01-01')
  17.  
  18.  
  19. no ROWS selected.

URL: http://oraclesponge.wordpress.com/2008/06/12/the-overlaps-predicate/

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