What cods have a subdivision name (RU) of Grodnenskaya Oblast'?
CREATE TABLE "current_codes" (
  "code" text,
  "subdivision_name_be_bgn_pcgn" text,
  "subdivision_name_be_gost" text,
  "subdivision_name_ru_bgn_pcgn" text,
  "subdivision_name_ru_gost" text,
  "subdivision_category" text
);
SELECT "code" FROM "current_codes" WHERE "subdivision_name_ru_bgn_pcgn"='Grodnenskaya oblast''';