CREATE TABLE "opinion_polls" (
  "polling_firm" text,
  "date" text,
  "psd_pc" text,
  "udmr" text,
  "elena_b_sescu" text,
  "others" text,
  "undecided" text
);

Question: What is the psd-pc for 18-22/04/2009?
SQL: SELECT "psd_pc" FROM "opinion_polls" WHERE "date"='18-22/04/2009';

Question: What date has the others of 2%?
SQL: SELECT "date" FROM "opinion_polls" WHERE "others"='2%';

Question: What was the UDMR for 18-22/04/2009?
SQL: SELECT "udmr" FROM "opinion_polls" WHERE "date"='18-22/04/2009';

Question: When the other is n/a and the psc-pc is 30% what is the date?
SQL: SELECT "date" FROM "opinion_polls" WHERE "others"='n/a' AND "psd_pc"='30%';

Question: What was the polling firm with others of 1%?
SQL: SELECT "polling_firm" FROM "opinion_polls" WHERE "others"='1%';

Question: What is the elena basescu when the poling firm of gallup?
SQL: SELECT "elena_b_sescu" FROM "opinion_polls" WHERE "polling_firm"='gallup';