Table: waratahs_1927_28_tour
Columns: name
tests
club
career_caps
tour_apps
position

Question: What is the tour Apps when the career caps show 15?
SQL: SELECT "tour_apps" FROM waratahs_1927_28_tour WHERE "career_caps" = 15

Question: What is the number of career caps for a full back, when tour Apps is smaller than 29?
SQL: SELECT COUNT("career_caps") FROM waratahs_1927_28_tour WHERE "position" = 'full back' AND "tour_apps" < 29

Question: What is the career caps for half-back, when tests is more than 3?
SQL: SELECT "career_caps" FROM waratahs_1927_28_tour WHERE "position" = 'half-back' AND "tests" > 3

Question: What name has tour Apps larger than 7, tests larger than 4, and a Career caps of 20?
SQL: SELECT "name" FROM waratahs_1927_28_tour WHERE "tour_apps" > 7 AND "tests" > 4 AND "career_caps" = 20