What is the highest production code of the episodes having a US viewership of exactly 2.3?
CREATE TABLE table_28787871_3 (production_code INTEGER, us_viewers__millions_ VARCHAR)
SELECT MAX(production_code) FROM table_28787871_3 WHERE us_viewers__millions_ = "2.3"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28787871_3 (production_code INTEGER, us_viewers__millions_ VARCHAR) Question: What is the highest production code of the episodes having a US viewership of exactly 2.3? [/INST] SELECT MAX(production_code) FROM table_28787871_3 WHERE us_viewers__millions_ = "2.3" </s>