如图所示,现有时间数据的时间字段是精确到时分秒的,现在需要计算PM2.5的日平均值,因此在查询时需要过滤时间字段的格式,去掉时分秒部分,只提取年月日部分. 查找资料,发现一般用CONVERT()函数实现该功能,但是在ACCESS中提示该函数未定义,可以考虑用Format函数代替. SELECT FORMAT(时间, "YYYY年MM月DD日") AS 逐日时间, 监测点, AVG(PM25) AS PM25日均 FROM 湖北省_201501 GROUP BY FORMAT(时间, &
SSH2+EasyUI项目用到了快逸报表,启动Tomcat后系统报错: Report System initing...... [2015-06-04 15:03:05] runqianReportLogger : [ERROR] - Name jdbc is not bound in this Context javax.naming.NameNotFoundException: Name jdbc is not bound in this Context at org.apache.nam
报错信息例如以下: - There is no report design object available. org.eclipse.birt.report.exception.ViewerException: There is no report design object available. at org.eclipse.birt.report.context.ViewerAttributeBean.__init(ViewerAttributeBean.java:226) at org.