CREATE TABLE "references" (
  "manufacturer" text,
  "model" text,
  "intro_date" text,
  "interface" text,
  "os" text,
  "price_usd" real,
  "price" text,
  "throughput" text
);

Question: What is the intro date for the interface that equals pci?
SQL: SELECT "intro_date" FROM "references" WHERE "interface"='PCI';

Question: What is the intro date for the throughput of 16 mbit/s?
SQL: SELECT "intro_date" FROM "references" WHERE "throughput"='16 Mbit/s';

Question: How many intro dates have the price of 686€?
SQL: SELECT COUNT("intro_date") FROM "references" WHERE "price"='686€';

Question: What is the price for the manufacturer LETech?
SQL: SELECT "price" FROM "references" WHERE "manufacturer"='LETech';

Question: What is the price (usd) for the model pq32mu?
SQL: SELECT MIN("price_usd") FROM "references" WHERE "model"='PQ32MU';

Question: Who is the manufacturer whose intro date is 2006 and their throughput is 4 mbit/s?
SQL: SELECT "manufacturer" FROM "references" WHERE "intro_date"='2006' AND "throughput"='4 Mbit/s';