How many directed by have 2.80 as u.s. viewers  (in millions)?
CREATE TABLE table_23499946_1 (directed_by VARCHAR, us_viewers__in_millions_ VARCHAR)
SELECT COUNT(directed_by) FROM table_23499946_1 WHERE us_viewers__in_millions_ = "2.80"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_23499946_1 (directed_by VARCHAR, us_viewers__in_millions_ VARCHAR) Question: How many directed by have 2.80 as u.s. viewers  (in millions)? [/INST] SELECT COUNT(directed_by) FROM table_23499946_1 WHERE us_viewers__in_millions_ = "2.80" </s>