收到以下错误:
Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'world.country.Code' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
运行以下查询时:
select countrylanguage.language, country.code, sum(country.population*countrylanguage.percentage/100)
from countrylanguage
join country on countrylanguage.countrycode = country.code
group by countrylanguage.language
order by sum(country.population*countrylanguage.percentage) desc ;
使用MySQL世界测试数据库(http://dev.mysql.com/doc/index-other.html).不知道为什么会这样.目前正在运行MYSQL 5.7.10.
有任何想法吗？？？:o