CREATE TABLE table_name_59 (_percentage_hydropower NUMBER, _percentage_coal VARCHAR2, _percentage_nuclear_power VARCHAR2)

what is the highest % hydropower when % coal is 4.9 and % nuclear power is more than 0?
SELECT MAX(_percentage_hydropower) FROM table_name_59 WHERE _percentage_coal = 4.9 AND _percentage_nuclear_power > 0
SELECT MAX("_percentage_hydropower") FROM "table_name_59" WHERE "_percentage_coal" = 4.9 AND "_percentage_nuclear_power" > 0