CREATE TABLE table_name_86 (number_of_electorates__2009_ INTEGER, district VARCHAR(255), constituency_number VARCHAR(255))
What was the highest number of 2009 electorates for Raisen when the consituency number was 142?
    
SQL: SELECT MAX(number_of_electorates__2009_) FROM table_name_86 WHERE district = "raisen" AND constituency_number = "142"