CREATE TABLE table_203_367 (id NUMBER, "year" CLOB, "driver" CLOB, "constructor" CLOB, "location" CLOB, "report" CLOB)

who won the year before alain prost ?
SELECT "driver" FROM table_203_367 WHERE id = (SELECT id FROM table_203_367 WHERE "driver" = 'alain prost') - 1
SELECT "driver" FROM "table_203_367" WHERE "id" = (SELECT "id" FROM "table_203_367" WHERE "driver" = 'alain prost') - 1