Question: Which category earlier than 2006 has Bart Brentjens as rider 2?
SQL: SELECT "Category" FROM "2-12498437-2" WHERE "Date" < 2006.0 AND "Rider 2" = 'Bart Brentjens';

Question: How many dates does the ladies category correspond to rothaus-cube?
SQL: SELECT COUNT("Date") FROM "2-12498437-2" WHERE "Category" = 'ladies' AND "Team" = 'rothaus-cube';

Question: Which category has a team of Cannondale Vredestein?
SQL: SELECT "Category" FROM "2-12498437-2" WHERE "Team" = 'Cannondale Vredestein';