1.数据分组求合,分别用的实体类以及datatable来分组求合,还有分组求和之后的如何取值 //实体类版本 List<ProgramTimeModel> TotalAllList = GetData(); var a = from p in TotalAllList.AsEnumerable() group p by p.ProgramTime_ID into g select new ProgramTimeModel { ProgramTime_ID = g.Key, Saled = g.…
分组求和mysql> SELECT coalesce(name, '总数'), SUM(singin) as singin_count FROM employee_tbl GROUP BY name WITH ROLLUP; +--------------------------+--------------+ | coalesce(name, '总数') | singin_count | +--------------------------+--------------+ | 小丽 | 2…
解决 Laravel/Lumen 出现 "Please provide a valid cache path" 问题 解决 Laravel/Lumen 出现 "Please provide a valid cache path" 问题 新建项目报错: //错误提示: InvalidArgumentException in Compiler.php line 36: Please provide a valid cache path. 错误提示的出错: // vend…