错误是在你的结果集中有两种字符集。
比如说你在两个表联合查询,一个表的字符集是latin1,另一个是utf8,这样在你的结果集中有两种字符集,mysql会报上面的错误。
一个表中不同的字段使用不同的字符集,也是一个道理。
用SHOW CREATE TABLE table_name;可以看出具体的字符集设置。解决方法:
将不同的字符集,转化成统一的字符集。
比如说你在两个表联合查询,一个表的字符集是latin1,另一个是utf8,这样在你的结果集中有两种字符集,mysql会报上面的错误。
一个表中不同的字段使用不同的字符集,也是一个道理。
用SHOW CREATE TABLE table_name;可以看出具体的字符集设置。解决方法:
将不同的字符集,转化成统一的字符集。
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.
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;