+----+----------+------------+---------+ | id | group_id | updated_at | comment | +----+----------+------------+---------+ | 1 | 1 | 2013-12-01 | C | | 2 | 2 | 2013-12-01 | A | | 3 | 1 | 2013-12-02 | B | | 4 | 2 | 2013-11-30 | D | +----+----------+------------+---------+ CREATE TABLE sample_table ( id int(11) NOT NULL, group_id int(11) NOT NULL, updated_at date NOT NULL, comment varchar(60) NOT NU
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