CREATE TABLE "demand" (
  "entities" text,
  "country" text,
  "supply_point" text,
  "voltage_k_v" real,
  "power_mw" real
);

Question: Which Country has Entities of emsa?
SQL: SELECT "country" FROM "demand" WHERE "entities"='emsa';

Question: Which Power (MW) has a Voltage (kV) of 500, and a Country of argentina?
SQL: SELECT AVG("power_mw") FROM "demand" WHERE "voltage_k_v"=500 AND "country"='argentina';

Question: How much Voltage (kV) has a Country of argentina, and a Power (MW) larger than 30, and a Supply point of yacyretá?
SQL: SELECT COUNT("voltage_k_v") FROM "demand" WHERE "country"='argentina' AND "power_mw">30 AND "supply_point"='yacyretá';