video_category

4 rows where v_uid = "v_f2vg3"

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Link v_uid c_uid
v_f2vg3,c_0j4bf v_f2vg3 Amateur c_0j4bf
v_f2vg3,c_98rqh v_f2vg3 Cowgirl c_98rqh
v_f2vg3,c_qnxxi v_f2vg3 Mature Woman c_qnxxi
v_f2vg3,c_s5lxs v_f2vg3 Married Woman c_s5lxs

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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);