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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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HANDLER tbl_name READ index_name { = | >= | <= | < } (value1,value2,...)
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