What is the Clean & jerk for the bodyweight less than 76.55, and the Total (kg) of –?
CREATE TABLE "middleweight_77_kg" (
  "name" text,
  "bodyweight" real,
  "snatch" real,
  "clean_jerk" text,
  "total_kg" text
);
SELECT "clean_jerk" FROM "middleweight_77_kg" WHERE "bodyweight"<76.55 AND "total_kg"='–';