CREATE TABLE table_name_20 (rd__number INT, pl_gp VARCHAR, reg_gp VARCHAR)

What is the largest Rd# for a PI GP greater than 0 and a Reg GP less than 62?
SELECT MAX(rd__number) FROM table_name_20 WHERE pl_gp > 0 AND reg_gp < 62
SELECT MAX("rd__number") FROM "table_name_20" WHERE "pl_gp" > 0 AND "reg_gp" < 62