文档解释ORA-30453:summarycontainsAVGwithoutcorrespondingCOUNTCause:IncrementalrefreshofsummarieswithAVG(X)requiresaCOUNT(X)columntobeincludedinthesummarydefinitionA...

文档解释ORA-30452:cannotcomputeAVG(X),VARIANCE(X)orSTDDEV(X),withoutCOUNT(X)orSUM(X)Cause:IncrementalrefreshofsummariesrequiresaCOUNT(X)columninordertoincrementally...

AVG函数返回数值列的平均值。NULL值不包括在计算中。SQLAVG()语法SELECTAVG(column_name)FROMtable_name...

 mysql>select*fromtable1;+----------+------------+-----+---------------------+|name_new|transactor|pid|order_date|+----------+------------+-----+-------...

1、NavgationControllerpop回来不进入viewdisload,利用原来载入的视图不是啊，他pop回来的时候不进viewdidload直接进去viewwillApper这种方法2、push过去后。隐藏UIToolBar RushViewController*rushViewControler...

avg函数对为null的行会忽略不计解决方案avg((coalesce(column,0))　　...