CREATE TABLE table_15318 ("Year" CLOB, "Start" CLOB, "Qual" CLOB, "Rank" CLOB, "Finish" CLOB, "Laps" FLOAT)

How many laps were in 1958?
SELECT SUM("Laps") FROM table_15318 WHERE "Year" = '1958'
SELECT SUM("Laps") FROM "table_15318" WHERE "Year" = '1958'