physician | treatment | certificationdate | certificationexpires -----------+-----------+-------------------+---------------------- 3 | 1 | 2008-01-01 | 2008-12-31 3 | 2 | 2008-01-01 | 2008-12-31 3 | 5 | 2008-01-01 | 2008-12-31 3 | 6 | 2008-01-01 | 2008-12-31 3 | 7 | 2008-01-01 | 2008-12-31 6 | 2 | 2008-01-01 | 2008-12-31 6 | 5 | 2007-01-01 | 2007-12-31 6 | 6 | 2008-01-01 | 2008-12-31 7 | 1 | 2008-01-01 | 2008-12-31 7 | 2 | 2008-01-01 | 2008-12-31 7 | 3 | 2008-01-01 | 2008-12-31 7 | 4 | 2008-01-01 | 2008-12-31 7 | 5 | 2008-01-01 | 2008-12-31 7 | 6 | 2008-01-01 | 2008-12-31 7 | 7 | 2008-01-01 | 2008-12-31