偏偏行

EXPLAIN SELECT y.emp_code as ‘EmpCode’,tp.name,SUM(my.meters) as ‘value’ from (SELECTm.emp_code,me.machine_code,m.curr_date,m.shift_time,m.shift_start_dateFROMtfshuttle.m_shift_emp AS mJOIN tfshuttle.m_shift_emp_machine AS me ON m.id = me.parent_i

SELECT olddata.machine_code AS 'machineCode', GROUP_CONCAT( olddata.param_type SEPARATOR ',' ) AS 'energyKinds', GROUP_CONCAT( olddata.real_qty SEPARATOR ',' ) AS 'realQtys' FROM ( SELECT mach...

前提  必须进入到你的mysql安装目录的bin目录下一般常用命令为 D：    进入哪一个磁盘命令cd   +文件名称   要打开哪一个文件夹dir     显示当前文件夹/目录下的所有文件----CMD-对数据库的操作和表结构的操作----《》mysql -uroot p +密码一.创建数据库+（设置字符集）create database +名称(c...

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SELECT a.id, a.tenant_code, a.machine_code, a.shift_class, a.job_sheet_no, a.stop_cause, a.start_time, ifnull( a.end_time, now( ) ) AS end_time, a.location, a.curr_date, a.start_time AS st...

请尝试以下方法 逐一试一下~~~~在你的数据库连接url后面加上 characterEncoding=utf-8例如jdbc.jdbcUrl:jdbc:mysql:///MyMavenShoppDemoTwo?characterEncoding=utf8在你接收参数时使用request域获得参数进行强制转码 String id= new String(request.ge...