CREATE TABLE "performance_against_each_opponent" (
  "matches" real,
  "innings" real,
  "not_out" real,
  "runs" real,
  "high_score" real,
  "average" real
);

Question: How many runs were there when the high score was 55 and there were more than 12 innings?
SQL: SELECT SUM("runs") FROM "performance_against_each_opponent" WHERE "high_score"=55 AND "innings">12;

Question: How many runs were there when there was 1 match and les than 86 average?
SQL: SELECT SUM("runs") FROM "performance_against_each_opponent" WHERE "matches"=1 AND "average"<86;