CREATE TABLE table_8141 ("Volume:Issue" CLOB, "Issue Date ( s ) " CLOB, "Weeks on Top" CLOB, "Song" CLOB, "Artist" CLOB)

How many weeks on top was OMC?
SELECT "Weeks on Top" FROM table_8141 WHERE "Artist" = 'omc'
SELECT "Weeks on Top" FROM "table_8141" WHERE "Artist" = 'omc'