CREATE TABLE "b" (
  "player" text,
  "nationality" text,
  "position" text,
  "from" real,
  "school_country" text
);

Question: Who is the player in the center position from 2006 with nationality of the United States?
SQL: SELECT "player" FROM "b" WHERE "nationality"='united states' AND "position"='center' AND "from"=2006;

Question: When England is the nationality what is the year from?
SQL: SELECT "from" FROM "b" WHERE "nationality"='england';

Question: What is the nationality with a forward position from a year after 2005?
SQL: SELECT "nationality" FROM "b" WHERE "position"='forward' AND "from">2005;