CREATE TABLE table_59304 ("Country" TEXT, "Electricity production  ( Kw/h ,  billion ) " FLOAT, "% Coal" FLOAT, "% Natural gas" FLOAT, "% Oil" FLOAT, "% Hydropower" FLOAT, "% Other renewable" FLOAT, "% Nuclear power" FLOAT)

what is the highest % hydropower when % coal is 4.9 and % nuclear power is more than 0?
SELECT MAX("% Hydropower") FROM table_59304 WHERE "% Coal" = '4.9' AND "% Nuclear power" > '0'
SELECT MAX("% Hydropower") FROM "table_59304" WHERE "% Coal" = '4.9' AND "% Nuclear power" > '0'