CREATE TABLE "pool_4" (
  "team" text,
  "tries_for" text,
  "tries_against" text,
  "try_diff" text,
  "points_for" text,
  "points_against" text,
  "points_diff" text
);

Question: What is points diff when points against is 123?
SQL: SELECT "points_diff" FROM "pool_4" WHERE "points_against"='123';

Question: Which team has 123 points agaibst the other team?
SQL: SELECT "team" FROM "pool_4" WHERE "points_against"='123';

Question: What is the points against when try diff is +23?
SQL: SELECT "points_against" FROM "pool_4" WHERE "try_diff"='+23';

Question: What is points when try diff is +23?
SQL: SELECT "points_for" FROM "pool_4" WHERE "try_diff"='+23';

Question: What is points sgsinst when points diff is +96?
SQL: SELECT "points_against" FROM "pool_4" WHERE "points_diff"='+96';