CREATE TABLE table_58164 ("Platform" FLOAT, "Frequency  ( per hour ) " FLOAT, "Destination" CLOB, "Operator" CLOB, "Line" CLOB)

what is the highest platform number when the frequency (per hour) is 4, the operator is london overground and the destination is west croydon?
SELECT MAX("Platform") FROM table_58164 WHERE "Frequency (per hour)" = '4' AND "Operator" = 'london overground' AND "Destination" = 'west croydon'
SELECT MAX("Platform") FROM "table_58164" WHERE "Destination" = 'west croydon' AND "Frequency (per hour)" = '4' AND "Operator" = 'london overground'