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数据库查询时，出现如下错误：

Caused by: com.mysql.jdbc.exceptions.jdbc4MySQLSyntaxErrorException: In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'credit_server.credit.id'; this is incompatible with sql_mode=only_full_group_by

详情如下：

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'credit_server.credit.id'; this is incompatible with sql_mode=only_full_group_by	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)	at com.mysql.jdbc.Util.getInstance(Util.java:408)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909)	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2490)	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)	at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1197)	at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:2931)	at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)	at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:2929)	at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:118)	at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:493)	at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)	at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)	at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)	at com.sun.proxy.$Proxy155.query(Unknown Source)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)	... 83 common frames omitted2019-03-13 16:58:48 [http-nio-8860-exec-1] WARN  o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolved exception caused by Handler execution: org.springframework.jdbc.BadSqlGrammarException: ### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'credit_server.credit.id'; this is incompatible with sql_mode=only_full_group_by### The error may exist in file [G:\gitcode\fsp\fsp-credit\credit-web\target\classes\mapper\CreditMapper.xml]### The error may involve defaultParameterMap### The error occurred while setting parameters### SQL: SELECT           id, user_id, product_id,SUM(credit_total), SUM(credit_used), SUM(credit_residue)         FROM credit     WHERE  1 = 1### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'credit_server.credit.id'; this is incompatible with sql_mode=only_full_group_by; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'credit_server.credit.id'; this is incompatible with sql_mode=only_full_group_by 2019-03-13 17:02:03 [AsyncResolver-bootstrap-executor-0] INFO  c.n.d.s.r.a.ConfigClusterResolver - Resolving eureka endpoints via configuration 2019-03-13 17:07:03 [AsyncResolver-bootstrap-executor-0] INFO  c.n.d.s.r.a.ConfigClusterResolver - Resolving eureka endpoints via configuration

这个是由于sql_mode设置不当引起的，修改下sql_mode即可：

查询：

select version(), @@sql_mode;

1.方式一

修改

SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

再查询：

[root@localhost etc]# cat my.cnf# For advice on how to change settings please see# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html[mysqld]## Remove leading # and set to the amount of RAM for the most important data# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.# innodb_buffer_pool_size = 128M## Remove leading # to turn on a very important data integrity option: logging# changes to the binary log between backups.# log_bin## Remove leading # to set options mainly useful for reporting servers.# The server defaults are faster for transactions and fast SELECTs.# Adjust sizes as needed, experiment to find the optimal values.# join_buffer_size = 128M# sort_buffer_size = 2M# read_rnd_buffer_size = 2Mdatadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-links=0log-error=/var/log/mysqld.logpid-file=/var/run/mysqld/mysqld.pid

在配置文件中添加指定的sql_mode:

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

添加后如下：

[root@localhost etc]# cat my.cnf# For advice on how to change settings please see# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html[mysqld]## Remove leading # and set to the amount of RAM for the most important data# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.# innodb_buffer_pool_size = 128M## Remove leading # to turn on a very important data integrity option: logging# changes to the binary log between backups.# log_bin## Remove leading # to set options mainly useful for reporting servers.# The server defaults are faster for transactions and fast SELECTs.# Adjust sizes as needed, experiment to find the optimal values.# join_buffer_size = 128M# sort_buffer_size = 2M# read_rnd_buffer_size = 2Mdatadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-links=0log-error=/var/log/mysqld.logpid-file=/var/run/mysqld/mysqld.pidsql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

然后重启mysql,这里也得看安装方式来选择对应的方式启动：

查询文件位置：find . -name '*my.cnf*'，*为模糊匹配

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