What functions were released on 2011-06-23? 
CREATE TABLE table_18138132_2 (function VARCHAR, release_date VARCHAR)
SELECT function FROM table_18138132_2 WHERE release_date = "2011-06-23"
### Context: CREATE TABLE table_18138132_2 (function VARCHAR, release_date VARCHAR) ### Question: What functions were released on 2011-06-23?  ### Answer: SELECT function FROM table_18138132_2 WHERE release_date = "2011-06-23"