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12 rows affected
conv_id user_id content sent_time
1 1 1st_msg 1990-01-01 00:01:01
1 2 2nd_msg 1990-01-01 00:01:02
2 1 1st_msg 1990-01-02 00:02:01
2 2 2nd_msg 1990-01-02 00:02:02
3 2 2nd_msg 1990-01-02 00:03:02
3 3 1st_msg 1990-01-02 00:03:01