video_category

1 row where c_uid = "c_yjh3u"

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Link v_uid c_uid
v_lx349,c_yjh3u v_lx349 Business Suit c_yjh3u

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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);