CREATE TABLE table_51334 ("Driver" CLOB, "Constructor" CLOB, "Laps" CLOB, "Time/Retired" CLOB, "Grid" CLOB)

Which driver had a grid of 18 with 68 laps?
SELECT "Driver" FROM table_51334 WHERE "Laps" = '68' AND "Grid" = '18'
SELECT "Driver" FROM "table_51334" WHERE "Grid" = '18' AND "Laps" = '68'