CREATE TABLE table_name_19 (overall INT, college VARCHAR, pick__number VARCHAR)

Which Overall is the highest one that has a College of oklahoma, and a Pick # smaller than 4?
SELECT MAX(overall) FROM table_name_19 WHERE college = "oklahoma" AND pick__number < 4
SELECT MAX("overall") FROM "table_name_19" WHERE "college" = "oklahoma" AND "pick__number" < 4