CREATE TABLE "european_tour_wins_19" (
  "no" real,
  "date" text,
  "tournament" text,
  "winning_score" text,
  "to_par" text,
  "margin_of_victory" text,
  "runner_s_up" text
);

Question: Name the margin of victory when the number is 15
SQL: SELECT "margin_of_victory" FROM "european_tour_wins_19" WHERE "no"=15;

Question: Name the number of numbers for howard clark
SQL: SELECT COUNT("no") FROM "european_tour_wins_19" WHERE "runner_s_up"='Howard Clark';

Question: Name the margin of victory when tournament is algarve open de portugal
SQL: SELECT "margin_of_victory" FROM "european_tour_wins_19" WHERE "tournament"='Algarve Open de Portugal';

Question: Name the tournament when margin of victory is 3 strokes and winning score is 71-66-70-67=274
SQL: SELECT "tournament" FROM "european_tour_wins_19" WHERE "margin_of_victory"='3 strokes' AND "winning_score"='71-66-70-67=274';