用FrameWork建模后,开发报表生成的sql会取所有的列,对于列式存储来说,效率是非常低的,请问有没有什么办法解决此问题?比如 表 TA 有100个列,表 TB有100个列,想要的sql是:SELECT TA.ID,SUM(TB.MONEY) FROM TA LEFT JOIN TB ON TA.ID=TB.IDGROUP BY TA.ID但是FrameWork建模后,开发报...(more)
OA门户系统登录,主页加载数据源,执行sql语句,但是发现执行返回的速度很慢,下面是执行的语句,怎么可以优化一下select * from (select A.*, ROWNUM RN FROM (select "unid","subject","sys_from","sys_flowCompleteTime","sys_file","sys_deptName","sys_companyName" from UNI...(more)
### Error querying database. Cause: com.ibm.db2.jcc.a.jm: [jcc][t4][10275][10041][3.50.151] ccsid、编码或语言环境不受支持:“Cp1383”。 ERRORCODE=-4220, SQLSTATE=22021### The error may exist in resources/mybatis/sys/TbskhxMapper.xml### The e...(more)
Select date, store_name, sum(dollars) as sales_dols, rank () over (partition by date order by sales_dols desc) as date_rank from period, store, saleswhere period.perkey = sales.perkey&nbs...