CREATE TABLE "currency" (
  "country" text,
  "currency" text,
  "1_euro" text,
  "1_usd" text,
  "central_bank" text
);

Question: What's the value of 1 USD in Paraguay?
SQL: SELECT "1_usd" FROM "currency" WHERE "country"='Paraguay';

Question: What's the value of 1 Euro in the country where the value of 1 USD is 483.050 of the local currency?
SQL: SELECT "1_euro" FROM "currency" WHERE "1_usd"='483.050';

Question: What's the name of the central bank in the country where Colombian Peso (cop) is the local currency?
SQL: SELECT "central_bank" FROM "currency" WHERE "currency"='Colombian peso (COP)';

Question: What's the name of the country where 1 USD equals 1.71577 of the local currency.
SQL: SELECT "country" FROM "currency" WHERE "1_usd"='1.71577';