Table: pga_tour_1991
Columns: date
tournament
location
winner
score
1st_prize

Question: What is the location of the tournament on Feb 10?
SQL: SELECT "location" FROM pga_tour_1991 WHERE "date" = 'feb 10'

Question: What is the date of the Kmart greater greensboro open in North Carolina?
SQL: SELECT "date" FROM pga_tour_1991 WHERE "location" = 'north carolina' AND "tournament" = 'kmart greater greensboro open'

Question: Who is the winner of the H.E.B. Texas open?
SQL: SELECT "winner" FROM pga_tour_1991 WHERE "tournament" = 'h.e.b. texas open'