CREATE TABLE "opinion_polls" (
  "polling_firm" text,
  "date_of_polling" text,
  "link" text,
  "liberal" real,
  "green" real
);

Question: What is the link for january 31 – february 3, 2011?
SQL: SELECT "link" FROM "opinion_polls" WHERE "date_of_polling"='january 31 – february 3, 2011';

Question: On what date of polling was the Polling Firm forum research with 7 green and less than 30 liberals?
SQL: SELECT "date_of_polling" FROM "opinion_polls" WHERE "polling_firm"='forum research' AND "green"=7 AND "liberal"<30;

Question: Which september 26–28, 2011 polling firm had a Link of html, less than 36 liberals,  and less than 8 green?
SQL: SELECT "polling_firm" FROM "opinion_polls" WHERE "link"='html' AND "liberal"<36 AND "green"<8 AND "date_of_polling"='september 26–28, 2011';

Question: What june 21–22, 2011 polling has green smaller than 13?
SQL: SELECT "polling_firm" FROM "opinion_polls" WHERE "green"<13 AND "date_of_polling"='june 21–22, 2011';