Every derived table must have its own alias

完整错误信息如下：

Every derived table must have its own alias三月 28, 2017 10:20:46 上午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [SpringMVC] in context with path [/yuyi] threw exception [Request processing failed; nested exception is org.springframework.jdbc.BadSqlGrammarException:
### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Every derived table must have its own alias
### The error may exist in file [/Users/aven/software/apachetomcat8041/webapps/yuyi/WEB-INF/classes/com/wanyu/yuyi/mapping/TemperatureMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: select * from (select a.* from temperature a, (select date(create_time) create_time,max(create_time) max_datetime from temperature where humeuser_id = ? group by date(create_time)) b where a.create_time=b.max_datetime and date(a.create_time)=b.create_time AND a.humeuser_id = ? GROUP BY a.create_time ORDER BY a.create_time DESC Limit 7) ORDER BY a.create_time ASC
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Every derived table must have its own alias
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Every derived table must have its own alias] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Every derived table must have its own aliasat 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:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)at com.mysql.jdbc.Util.getInstance(Util.java:384)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4232)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4164)at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1307)at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:169)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:498)at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:62)at com.sun.proxy.$Proxy30.execute(Unknown Source)at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:59)at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)at com.sun.proxy.$Proxy13.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:198)at com.wanyu.yuyi.dao.TemperatureDao.findByWeekSelect(TemperatureDao.java:42)at com.wanyu.yuyi.service.TemperatureManager.findByWeekSelect(TemperatureManager.java:44)at com.wanyu.yuyi.controller.TemperatureController.findList(TemperatureController.java:66)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:498)at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:509)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1524)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1480)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)

这主要是SQL语句的语法错误：

select * from (select a.* from temperature a, (select date(create_time) create_time,max(create_time) max_datetime from temperature where humeuser_id = ? group by date(create_time)) b where a.create_time=b.max_datetime and date(a.create_time)=b.create_time AND a.humeuser_id = ? GROUP BY a.create_time ORDER BY a.create_time DESC Limit 7) ORDER BY a.create_time ASC

select * from (select a.* from temperatur) 别名 where id=1

Select 嵌套使用临时表时，需要为临时表指定别名。

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