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String sql="select *,count(groupName) as isNum,'Y' as isMark from t_pm_projecttemplate group by groupName order by groupName ";上述SQL语句报错如下：
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'zjrxmis.t_pm_projecttemplate.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
原因是什么呢？简单的讲就是select查询的列不包含在group by的列中；
深入分析原因：
已知我的mysql版本如下，
only_full_group_by：使用这个就是使用和oracle一样的group 规则, select的列都要在group中,或者本身是聚合列(SUM,AVG,MAX,MIN) 才行，其实这个配置目前个人感觉和distinct差不多的，所以去掉就好
所以修改mysql配置文件如下即可：
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION