下面是我最近開(kāi)發(fā)當(dāng)中遇到的一些復(fù)雜的SQL的語(yǔ)句如何處理以及優(yōu)化查詢(xún)我還在找確切的辦法來(lái)進(jìn)行解決。還在進(jìn)行中,當(dāng)然對(duì)于數(shù)據(jù)庫(kù)確實(shí)我進(jìn)行一定的處理,還是有一定的效果的。下面就進(jìn)入正題吧!

2.花了2天時(shí)間寫(xiě)的SQL查詢(xún)?cè)陆Y(jié)算歷史的數(shù)據(jù)

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  1  select                                                                                                                                                                                                            
  2              sum(case when indentdate >= '2015-11-28 00:00:00' and                                    &nb