下面为您介绍的MySQL字符集处理方法是将不同的MySQL字符集，转化成统一的字符集。 该方法供您参考，希望对您学习MySQL字符集方面能有所启迪。
- After an upgrade to MySQL 4.1, the statement fails:
- mysql> SELECT SUBSTRING_INDEX(USER(),'@',1);
- ERROR 1267 (HY000): Illegal mix of collations
- (utf8_general_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE)
- for operation 'substr_index'
- The reason this occurs is that usernames are stored using UTF8 (see section 11.6 UTF8 for Metadata). As a result, the USER() function and the literal string '@' have different character sets (and thus different collations):
- mysql> SELECT COLLATION(USER()), COLLATION('@');
- +-------------------+-------------------+
- | COLLATION(USER()) | COLLATION('@') |
- +-------------------+-------------------+
- | utf8_general_ci | latin1_swedish_ci |
- +-------------------+-------------------+
- One way to deal with this is to tell MySQL to interpret the literal string as utf8:
- mysql> SELECT SUBSTRING_INDEX(USER(),_utf8'@',1);
- +------------------------------------+
- | SUBSTRING_INDEX(USER(),_utf8'@',1) |
- +------------------------------------+
- | root |
- +------------------------------------+
- Another way is to change the connection character set and collation to utf8. You can do that with SET NAMES 'utf8' or by setting the character_set_connection and collation_connection system variables directly.
表的编码转换可以用：（MySQL Version > 4.12）
- ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name;
之前的版本可以用：
- ALTER TABLE tbl_name CHARACTER SET charset_name;
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