video_category

3 rows where v_uid = "v_9lx5j"

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Link v_uid c_uid
v_9lx5j,c_33yzf v_9lx5j ハイビジョン c_33yzf
v_9lx5j,c_mrq61 v_9lx5j 女子校生 c_mrq61
v_9lx5j,c_wfvzr v_9lx5j 巨乳 c_wfvzr

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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);