video_category

3 rows where c_uid = "c_2gf7c"

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Link v_uid c_uid
v_3g3mv,c_2gf7c v_3g3mv Leotards c_2gf7c
v_i4c4x,c_2gf7c v_i4c4x Leotards c_2gf7c
v_so58a,c_2gf7c v_so58a Leotards c_2gf7c

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CREATE TABLE video_category (
  v_uid TEXT NOT NULL REFERENCES videos(uid)     ON DELETE CASCADE,
  c_uid TEXT NOT NULL REFERENCES categories(uid) ON DELETE CASCADE,
  PRIMARY KEY (v_uid, c_uid)
);
CREATE INDEX idx_video_category_c ON video_category(c_uid);