CREATE TABLE table_name_27 (events NUMBER, top_5 VARCHAR2, top_10 VARCHAR2, tournament VARCHAR2)

What is the average number of events of PGA Championship tournaments with a top-5 less than 0?
SELECT AVG(events) FROM table_name_27 WHERE top_10 = 0 AND tournament = "pga championship" AND top_5 < 0
SELECT AVG("events") FROM "table_name_27" WHERE "pga championship" = "tournament" AND "top_10" = 0 AND "top_5" < 0