Who directed the episode with production code 28?
CREATE TABLE table_12226390_2 (directed_by VARCHAR, production_code VARCHAR)
SELECT directed_by FROM table_12226390_2 WHERE production_code = 28
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_12226390_2 (directed_by VARCHAR, production_code VARCHAR) Question: Who directed the episode with production code 28? [/INST] SELECT directed_by FROM table_12226390_2 WHERE production_code = 28 </s>