CREATE TABLE "references" (
  "year" real,
  "conference" text,
  "city" text,
  "country" text,
  "local_host_s" text
);

Question: What is the sum of year with the local host Sai?
SQL: SELECT SUM("year") FROM "references" WHERE "local_host_s"='sai';

Question: Who are the local hosts for the United States in years earlier than 2007?
SQL: SELECT "local_host_s" FROM "references" WHERE "country"='united states' AND "year"<2007;

Question: Which city has a conference of LCC2 and a year earlier than 2009?
SQL: SELECT "city" FROM "references" WHERE "year"<2009 AND "conference"='lcc2';