具体报错

[2019-02-20 11:57:36] [][] Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'exer.student.sid' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

解决方案

select version(),

@@sql_mode;SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));
show variables like "sql_mode";

set sql_mode='';

set sql_mode='NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES';

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