CREATE TABLE "brazil" (
  "plan" text,
  "downstream" text,
  "upstream" text,
  "up_down_ratio" real,
  "monthly_cap" text,
  "price" text
);

Question: What is the highest up:down ratio with 4 mbit/s upstream?
SQL: SELECT MAX("up_down_ratio") FROM "brazil" WHERE "upstream"='4 mbit/s';

Question: What is the upstream with a 150 gb monthly cap?
SQL: SELECT "upstream" FROM "brazil" WHERE "monthly_cap"='150 gb';

Question: What is the upstream with an up:down ratio of 0.03 and a 150 gb monthly cap?
SQL: SELECT "upstream" FROM "brazil" WHERE "up_down_ratio"=0.03 AND "monthly_cap"='150 gb';