video_category

4 rows where c_uid = "c_hqvm9"

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Link v_uid c_uid
v_huahe,c_hqvm9 v_huahe Confinement c_hqvm9
v_iwipm,c_hqvm9 v_iwipm Confinement c_hqvm9
v_naxo3,c_hqvm9 v_naxo3 Confinement c_hqvm9
v_nswzu,c_hqvm9 v_nswzu Confinement c_hqvm9

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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);