How many sockets are listed that have a brand name of "Core i3-2xx7m"?
CREATE TABLE "core_i3" (
  "codename_main_article" text,
  "brand_name_list" text,
  "cores" real,
  "l3_cache" text,
  "socket" text,
  "tdp" text,
  "i_o_bus" text
);
SELECT COUNT("socket") FROM "core_i3" WHERE "brand_name_list"='Core i3-2xx7M';