human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Episode Number, Episode Name, Airdate, Viewers (millions), Rank(Timeslot), Rank 18–49 (Night)
###Question: what is the total rank on airdate march 30, 2011?
gpt
SELECT COUNT Rank(Timeslot) FROM table WHERE Airdate = March 30, 2011