human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: TV Station (Operator), 2005, 2006, 2007, 2008, 2009, 2010, 2011 1H
###Question: What is the number of 2008 values having a 2006 under 17.3, 2010 over 4, and 2011 1H of 20?
gpt
SELECT COUNT 2008 FROM table WHERE 2006 < 17.3 AND 2010 > 4 AND 2011 1H = 20