1,修改資料庫字符集：
alter database db_name default character set character_name[collate ...];2，修改表和所有字元列（char,varchar,text）的字符集：
alter table tb_name convert to character set character_name[collate ...]例如：alter table users convert to character set utf8 collate utf8_general_ci;
3，只修改表的預設字符集：
alter table tb_name default character set character_name[collate ...];例如：alter table users default character set utf8 collate utf8_general_ci;
4，修改欄位的字符集：
alter table tb_name change c_name c_name character set character_name[collate ...];例如：alter table users change nick nick varchar(300) character set utf8 collate utf8_general_ci;
5，檢視資料庫編碼
，檢視表編碼
，檢視字段編碼
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