CREATE TABLE "classification_leadership_by_stage" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "young_rider_classification" text,
  "trofeo_fast_team" text
);

Question: What is the general classification of stage 3
SQL: SELECT "general_classification" FROM "classification_leadership_by_stage" WHERE "stage"='3';

Question: How many points did lech piasecki, stephen roche, and carrera jeans-vagabond have?
SQL: SELECT "points_classification" FROM "classification_leadership_by_stage" WHERE "young_rider_classification"='lech piasecki' AND "general_classification"='stephen roche' AND "winner"='carrera jeans-vagabond';