CREATE TABLE table_40408 ("Platform" FLOAT, "Frequency  ( per hour ) " FLOAT, "Destination" CLOB, "Service Pattern" CLOB, "Operator" CLOB, "Line" CLOB)

Which line has an operator of the London Overground and ends at the Crystal Palace?
SELECT "Line" FROM table_40408 WHERE "Operator" = 'london overground' AND "Destination" = 'crystal palace'
SELECT "Line" FROM "table_40408" WHERE "Destination" = 'crystal palace' AND "Operator" = 'london overground'