video_category

3 rows where c_uid = "c_2scrs"

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Link v_uid c_uid
v_2wu4c,c_2scrs v_2wu4c How To c_2scrs
v_ggy4w,c_2scrs v_ggy4w How To c_2scrs
v_oogan,c_2scrs v_oogan How To c_2scrs

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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);