ãã¼ã ããããå·çãããè¨äºã§ãå±¥æ´ãã¼ãã«ããææ°ã®1件ãåã£ã¦ããæ¹æ³ã«ã¤ãã¦è§£èª¬ãã¦ãããPostgreSQLã®ä¾ã ã¨ä»¥ä¸ã®ãããªã¦ã¼ã¶ã¼ã®å±¥æ´ãã¼ã¿ã«å¯¾ã: CREATE TABLE history ( id SERIAL PRIMARY KEY, user_id INTEGER NOT NULL, data TEXT, created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ); INSERT INTO history (user_id, data, created_at) VALUES (1, 'First entry of user1', '2024-01-01 10:00:00'), (1, 'Second entry of user1', '2024-01-02 09:30:00'), (2, 'First entr
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