CREATE TABLE table_51461 ("Episode" CLOB, "Air Date" CLOB, "Timeslot" CLOB, "Households  ( Rating/Share ) " CLOB, "18-49  ( Rating/Share ) " CLOB, "Viewers  ( m ) " FLOAT, "Weekly Rank  ( # ) " CLOB)

Name the 18-49 rating for weekly rank of 30
SELECT "18-49 (Rating/Share)" FROM table_51461 WHERE "Weekly Rank (#)" = '30'
SELECT "18-49 (Rating/Share)" FROM "table_51461" WHERE "Weekly Rank (#)" = '30'