video_category

3 rows where v_uid = "v_zuj3c"

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Link v_uid c_uid
v_zuj3c,c_0j4bf v_zuj3c Amateur c_0j4bf
v_zuj3c,c_98rqh v_zuj3c Cowgirl c_98rqh
v_zuj3c,c_ffda8 v_zuj3c Handjob c_ffda8

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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);