CREATE TABLE table_name_79 (time_retired VARCHAR2, driver VARCHAR2, laps VARCHAR2, grid VARCHAR2)

what is the time/retired when the laps is 6, the grid is less than 18 and the driver is clay regazzoni?
SELECT time_retired FROM table_name_79 WHERE laps = 6 AND grid < 18 AND driver = "clay regazzoni"
SELECT "time_retired" FROM "table_name_79" WHERE "clay regazzoni" = "driver" AND "grid" < 18 AND "laps" = 6