On what date do others have 5% with an SZDSZ of 5%?
CREATE TABLE "opinion_polls" (
  "source" text,
  "date" text,
  "fidesz" text,
  "mszp" text,
  "szdsz" text,
  "jobbik" text,
  "others" text
);
SELECT "date" FROM "opinion_polls" WHERE "others"='5%' AND "szdsz"='5%';