今天帮同事处理一个SQL（简化过后的）执行报错：
代码如下:
mysql> select date_format('2013-11-19','Y-m-d') > timediff('2013-11-19', '2013-11-20');
ERROR 1267 (HY000): Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,NUMERIC) for operation '>'
乍一看挺莫名其妙的，查了下手册，发现有这么一段：
代码如下:
The language used for day and month names and abbreviations is controlled by the value of the lc_time_names system variable (Section 9.7, “MySQL Server Locale Support”).
The DATE_FORMAT() returns a string with a character set and collation given by character_set_connection and collation_connection so that it can return month and weekday names containing non-ASCII characters.
原载于：联动北方
全文：http://bbs.landingbj.com/t-0-248293-1.html
代码如下:
mysql> select date_format('2013-11-19','Y-m-d') > timediff('2013-11-19', '2013-11-20');
ERROR 1267 (HY000): Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,NUMERIC) for operation '>'
乍一看挺莫名其妙的，查了下手册，发现有这么一段：
代码如下:
The language used for day and month names and abbreviations is controlled by the value of the lc_time_names system variable (Section 9.7, “MySQL Server Locale Support”).
The DATE_FORMAT() returns a string with a character set and collation given by character_set_connection and collation_connection so that it can return month and weekday names containing non-ASCII characters.
原载于：联动北方
全文：http://bbs.landingbj.com/t-0-248293-1.html
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/30029358/viewspace-1354333/ ，如需转载，请注明出处，否则将追究法律责任。
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