CREATE TABLE table_name_80 (opened NUMBER, system VARCHAR2, daily_ridership VARCHAR2)

Which Opened has a System of c-train, and a Daily ridership smaller than 269,600?
SELECT MAX(opened) FROM table_name_80 WHERE system = "c-train" AND daily_ridership < 269 OFFSET 600
SELECT MAX("opened") FROM "table_name_80" WHERE "c-train" = "system" AND "daily_ridership" < 269 OFFSET 600 ROWS