Table: hardware_rngs
Columns: manufacturer
model
intro_date
interface
os
price_usd
price
throughput

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

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

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

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

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

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