在使用MySQL的Group by having语句时候,遇到一个错误提示问题。
sql执行语句如下
select * from user_subscribe group by user_id,order_type having count(*)>1
错误提示如下
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'firefly.user_subscribe.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
问题出现的原因:
MySQL 5.7.5及以上功能依赖检测功能。如果启用了ONLY_FULL_GROUP_BY SQL模式(默认情况下),MySQL将拒绝选择列表,HAVING条件或ORDER BY列表的查询引用在GROUP BY子句中既未命名的非集合列,也不在功能上依赖于它们。(5.7.5之前,MySQL没有检测到功能依赖关系,默认情况下不启用ONLY_FULL_GROUP_BY。有关5.7.5之前的行为的说明,请参见“MySQL 5.6参考手册”。)
解决方法如下:MySQL Handling of GROUP BY
用sql查询:
select @@global.sql_mode; select version(), @@sql_mode; show variables like '%sql_mode%'
查询出来的值为:
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
去掉ONLY_FULL_GROUP_BY,重新设置值。
set @@global.sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'; set @@sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
去掉ONLY_FULL_GROUP_BY即可正常执行sql.
其实,global.sql_mode不用设置也可以,一般我喜欢都设置成一样的,保持一致。
参考文章
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