在使用GROUP BY对Mysql的数据表进行查询时如果出现以下错误
ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause
and contains nonaggregated column 'player.song_sheet.type' which is not
functionally dependent on columns in GROUP BY clause; this is
incompatible with sql_mode=only_full_group_by
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解决方法1:
1.查询mysql 相关mode
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select @@global.sql_mode;
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可以看到模式中包含了ONLY_FULL_GROUP_BY,只要没有这个配置即可。
我的Mysql版本是5.7.23,默认是带了ONLY_FULL_GROUP_BY模式。
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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
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2.重设模式值
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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';
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解决方法2:
打开mysql配置文件:my.cnf,直接选择打开mysql配置文件,然后在最底部添加
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sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
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重启mysql即可