我正在运行一个查询(执行需要3分钟)-SELECTc.eveDate,c.hour,SUM(c.dataVolumeDownLink)+SUM(c.dataVolumeUpLink)FROMcdrcWHEREc.evedate>='2013-10-19'GROUPBYc.hour;有解释计划-idselect_typetabletypepossible_keyskeykey_lenrefrowsExtra1SIMPLEcALLevedate_index,eve_hour_index31200000Usingwhere;Usingtemporary;Usingfilesort我正在使用表