CREATE TABLE "assembly_segments" (
  "constituency_number" real,
  "name" text,
  "reserved_for_sc_st_none" text,
  "district" text,
  "number_of_electorates_2009" real
);

Question: Which Number of electorates (2009) has a District of jhajjar, and a Reserved for (SC/ST/None) of sc, and a Constituency number smaller than 66?
SQL: SELECT COUNT("number_of_electorates_2009") FROM "assembly_segments" WHERE "district"='jhajjar' AND "reserved_for_sc_st_none"='sc' AND "constituency_number"<66;