该SQL语句执行后,报"NOT A GROUP BY EXPRESSION",请问问题出在哪里...答:select unique t2.policyno "保单号码",t8.STARTDATE "起保日期",t8.ENDDATE "终保日期",t1.damagestartdate "出险日期",t1.REGISTNO "报案号码",t1.REPORTDATE "报案日期",t1.CLAIMNO "立案号码",t3.ACCIDENTNO "事故号码",t1.CLAIMDATE "立案日期",t1.underwriteenddate "核赔通过...