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SQL语句优化
...如：select*fromYF_KCMXwhereYPXHin(12,13)Select*fromYF_KCMXwherebetween12and13一般在GROUPBY个HAVING字句之前就能剔除多余的行，所以尽量不要用它们来做剔除行的工作。他们的执行顺序应该如下最优：select的Where字句选择所有合适的行，GroupBy用来...
- http://bbs.hc3i.cn/thread-133187-1-1.html
- 时间: 2014/06/24
64螺旋CT与冠状动脉血管造影评估冠状动脉侧支循环对照研究
...leastonemajorcoronaryartery．neCCCswereassessedinCAGbytheRentropgrading．andtheCAGserved嬲thegoldstandardtodeterminetheaccuracyof64一MSCTangiographyindetectingcollateralcirculations．AllCCCsweregroupedangiographicallyintothreegroupsofCC0，CCI，andCC2byWemercollateralcollection(CC)grading．In...
- http://bbs.hc3i.cn/thread-31992-1-1.html
- 时间: 2011/04/21
IL-8与TNF-α动态变化规律与急性脑出血的相关性分析
...识码]A[文章编号]1674-4721（2010）11（b）-040-02 IL-8andTNF-αdynamicsandcorrelationanalysisofacutecerebralhemorrhage HEHuifen (ThePeople′sHospitalofRuchengCounty,HunanProvince,Rucheng424100,China) [Abstract]Objective:ToinvestigatetheTNF-αandIL-8andacutecerebral...
- http://bbs.hc3i.cn/thread-29035-1-1.html
- 时间: 2011/02/13
医院数据库系统SQL语句优化
...heddatabasesystems.However,alongwiththedeepeningofthelevelofinformatizationandincreasingdata,resultingdatabasebusinessprocessingratehasbeenreduced.Therefore,aneffectivedatabasemonitoringandperformanceanalysisofthedatabasebecomesthecriticalstep.Thispaperexpoundsthemainparameteraffectingthedatabasecap...
- http://bbs.hc3i.cn/thread-22489-1-1.html
- 时间: 2010/10/25