Context: CREATE TABLE table_name_86 (number_of_electorates__2009_ INTEGER, district VARCHAR, constituency_number VARCHAR)
Question: What was the highest number of 2009 electorates for Raisen when the consituency number was 142?
Answer: SELECT MAX(number_of_electorates__2009_) FROM table_name_86 WHERE district = "raisen" AND constituency_number = "142"