CREATE TABLE "polling" (
  "poll_source" text,
  "dates_administered" text,
  "tom_emmer_r" text,
  "matt_entenza_dfl" text,
  "tom_horner_i" text,
  "undecided" text,
  "sampling_error" text
);

Question: What percentage voted for Tom Horner according to the poll source with sampling error of 2.5%?
SQL: SELECT "tom_horner_i" FROM "polling" WHERE "sampling_error"='2.5%';

Question: What's the percentage of undecided according to the poll source with sampling error of 2.7%?
SQL: SELECT "undecided" FROM "polling" WHERE "sampling_error"='2.7%';

Question: When did Minnesota Poll administer their poll?
SQL: SELECT "dates_administered" FROM "polling" WHERE "poll_source"='Minnesota Poll';

Question: How many polls show different percentages for Tom Emmer and 38% for Matt Entenza?
SQL: SELECT COUNT("tom_emmer_r") FROM "polling" WHERE "matt_entenza_dfl"='38%';

Question: What poll source administered their poll on June 14-16, 2010?
SQL: SELECT "poll_source" FROM "polling" WHERE "dates_administered"='June 14-16, 2010';

Question: What's the percentage of votes for Tom Horner according to the poll source that claimed 31% for Matt Entenza?
SQL: SELECT "tom_horner_i" FROM "polling" WHERE "matt_entenza_dfl"='31%';