下面為您介紹的MySQL字符集處理方法是將不同的MySQL字符集，轉化成統一的字符集。 該方法供您參考，希望對您學習MySQL字符集方面能有所啟迪。
- 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.
表的編碼轉換可以用：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;
深入研究MySQL刪除多表數據
多個MySQL表結果集組合
MySQL分表處理的實現方法
MySQL授權表使用示例
MySQL內存表的弊端
