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show variables like '%char%';
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mysql> show variables like '%char%';
+--------------------------+----------------------------------------+
| Variable_name            | Value                                  |
+--------------------------+----------------------------------------+
| character_set_client     | gbk                                    |
| character_set_connection | gbk                                    |
| character_set_database   | gbk                                    |
| character_set_filesystem | binary                                 |
| character_set_results    | gbk                                    |
| character_set_server     | gbk   


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