CREATE TABLE table_75169 ("Volume:Issue" CLOB, "Issue Date ( s ) " CLOB, "Weeks on Top" FLOAT, "Song" CLOB, "Artist" CLOB)

Which Weeks on Top have an Issue Date(s) of 20 november?
SELECT SUM("Weeks on Top") FROM table_75169 WHERE "Issue Date(s)" = '20 november'
SELECT SUM("Weeks on Top") FROM "table_75169" WHERE "Issue Date(s)" = '20 november'