CREATE TABLE "opinion_polls" (
  "source" text,
  "date" text,
  "martin" text,
  "gr_ne" text,
  "others" text,
  "undecided" text
);

Question: What percent of others did ogm/news count when MARTIN had 9%?
SQL: SELECT "others" FROM "opinion_polls" WHERE "martin"='9%' AND "source"='ogm/news';

Question: What is the Undecided the others was 4%?
SQL: SELECT "undecided" FROM "opinion_polls" WHERE "others"='4%';

Question: What is the Undecided on 2009-05-24?
SQL: SELECT "undecided" FROM "opinion_polls" WHERE "date"='2009-05-24';

Question: What is the Date that has MARTIN of 7–9% and no Undecided?
SQL: SELECT "date" FROM "opinion_polls" WHERE "undecided"='–' AND "martin"='7–9%';

Question: What is the Date when MARTIN had 8%?
SQL: SELECT "date" FROM "opinion_polls" WHERE "martin"='8%';