CREATE TABLE table_name_21 (number_of_electorates__2009_ NUMBER, constituency_number VARCHAR2, district VARCHAR2, reserved_for___sc___st__none_ VARCHAR2)

What is the number of electorates (2009) for the Indore district, when reserved for (SC / ST /None) is none, and constituency number is 208?
SELECT SUM(number_of_electorates__2009_) FROM table_name_21 WHERE district = "indore" AND reserved_for___sc___st__none_ = "none" AND constituency_number = "208"
SELECT SUM("number_of_electorates__2009_") FROM "table_name_21" WHERE "208" = "constituency_number" AND "district" = "indore" AND "none" = "reserved_for___sc___st__none_"