How many of the episodes in the top 50 rankings were originally aired on June 28, 2010?
CREATE TABLE table_22170495_7 (top_50_ranking VARCHAR, original_airing VARCHAR)
SELECT COUNT(top_50_ranking) FROM table_22170495_7 WHERE original_airing = "June 28, 2010"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_22170495_7 (top_50_ranking VARCHAR, original_airing VARCHAR) Question: How many of the episodes in the top 50 rankings were originally aired on June 28, 2010? [/INST] SELECT COUNT(top_50_ranking) FROM table_22170495_7 WHERE original_airing = "June 28, 2010" </s>