video_category

2 rows where c_uid = "c_3adjg"

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Link v_uid c_uid
v_mv3n1,c_3adjg v_mv3n1 Secretary c_3adjg
v_tvp8a,c_3adjg v_tvp8a Secretary c_3adjg

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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);