What's the part number of the processor that has an 1.8 ghz frequency and 2 × 256 kb L@ Cache?
CREATE TABLE "sandy_bridge_dual_core_32_nm" (
  "model_number" text,
  "s_spec_number" text,
  "cores" text,
  "frequency" text,
  "turbo" text,
  "l2_cache" text,
  "l3_cache" text,
  "gpu_model" text,
  "gpu_frequency" text,
  "socket" text,
  "i_o_bus" text,
  "release_date" text,
  "part_number_s" text,
  "release_price_usd" text
);
SELECT "part_number_s" FROM "sandy_bridge_dual_core_32_nm" WHERE "l2_cache"='2 × 256 kb' AND "frequency"='1.8 ghz';