CREATE TABLE ncrossdict (
  url_id  int4 DEFAULT '0' NOT NULL,
  ref_id  int4 DEFAULT '0' NOT NULL,
  word_id int4 DEFAULT '0' NOT NULL,
  intag   int4 DEFAULT '0' NOT NULL
);
CREATE INDEX ncrossdict_url_id ON ncrossdict (url_id);
CREATE INDEX ncrossdict_ref_id ON ncrossdict (ref_id);
CREATE INDEX ncrossdict_word_id ON ncrossdict (word_id);