mysql经过group by分组后，用max取每组中最大的项，并用laravel的paginate支持分页

mysql> select * from test; +----+-------+------+-------+ | id | name | age | class | +----+-------+------+-------+ | 1 | qiu | 22 | 1 | | 2 | liu | 42 | 1 | | 4 | zheng | 20 |

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