Fechas de superposition de dates
TableA (id int, match1 char, match2 char, match3 char, startdate datetime, enddate, estado char) id match1 match2 match3 startdate enddate 1 AAA BBB CCC 2006-01-01 2007-01-01 2 AAA BBB CCC 2006-12-12 2008-01-01 3 AAA BBB CCC 2008-01-01 2012-02-02 4 DDD EEE FFF 2009-01-01 2012-01-01 5 DDD EEE FFF 2013-01-01 2020-01-01 Ref TableB (match1 char, match2, […]