What's the standard name that has a common name of ADSL Over Pots and ADSL version?
CREATE TABLE "adsl_standards" (
  "version" text,
  "standard_name" text,
  "common_name" text,
  "downstream_rate" text,
  "upstream_rate" text
);
SELECT "standard_name" FROM "adsl_standards" WHERE "version"='adsl' AND "common_name"='adsl over pots';