CREATE TABLE "module_specifications" (
  "designation" text,
  "bus_width_bits" real,
  "channels" text,
  "clock_rate_m_hz" real,
  "bandwidth_mb_s" real
);

Question: Clock rate (MHz) smaller than 400, and a Bandwidth (MB/s) of 1420 has what channels?
SQL: SELECT "channels" FROM "module_specifications" WHERE "clock_rate_m_hz"<400 AND "bandwidth_mb_s"=1420;

Question: Bandwidth (MB/s) smaller than 4800, and a Bus width (bits) smaller than 16 has what highest Clock rate (MHz)?
SQL: SELECT MAX("clock_rate_m_hz") FROM "module_specifications" WHERE "bandwidth_mb_s"<4800 AND "bus_width_bits"<16;

Question: Designation of pc800 has which highest Bus width (bits)?
SQL: SELECT MAX("bus_width_bits") FROM "module_specifications" WHERE "designation"='pc800';