video_category

4 rows where v_uid = "v_xjn6f"

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Link v_uid c_uid
v_xjn6f,c_0951h v_xjn6f Hi-Def c_0951h
v_xjn6f,c_0j4bf v_xjn6f Amateur c_0j4bf
v_xjn6f,c_ddrgh v_xjn6f Kiss Kiss c_ddrgh
v_xjn6f,c_uylsl v_xjn6f Couple c_uylsl

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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);