SET NAMES
语法
SET NAMES {'charset_name'
[COLLATE 'collation_name'] | DEFAULT}
描述
这会设置character_set_client、character_set_connection和character_set_results，同时还会隐式地设置会话级的系统变量collation_connection为指定的字符集和排序规则。
这决定了client将语句发送给server端以及server端将语句执行结果返回给client端时使用的character set。
COLLATE子句是可选的，如果不定义(或设置为DEFAULT)，将使用字符集的默认排序规则default collation for the character set。
See also
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