Table: grand_slam_champions
Columns: player
australian_open
french_open
wimbledon
us_open

Question: When did Shirley Fry Irvin win the US Open?
SQL: SELECT MIN("us_open") FROM grand_slam_champions WHERE "player" = 'Shirley Fry Irvin'

Question: What year did Martina Navratilova win Wimbledon?
SQL: SELECT "wimbledon" FROM grand_slam_champions WHERE "player" = 'Martina Navratilova'