例句與造句

1. Too many complex relational joins between too many tables can hinder performance
   太多表間的關(guān)系聯(lián)接太多、太復(fù)雜可能會(huì)影響性能。
2. When user defined functions ( udfs ) are involved in the join predicate , the algorithms for the computation of relational joins can not be used directly . in the paper , the restricting transformation function r , is defined , which can restrict some variable ' s values . without scanning the entire relation , performance of join algorithm can be improved greatly
   當(dāng)連接條件中包含用戶自定義的復(fù)雜函數(shù)時(shí)，原有的連接算法不能直接應(yīng)用于該連接運(yùn)算，為此，本文提出了限定變換函數(shù)t _ r概念，來限定連接謂詞中某些變?cè)娜≈捣秶?，從而避免?duì)整個(gè)關(guān)系的掃描，達(dá)到提高連接算法性能的目的。
3. It's difficult to find relational join in a sentence. 用relational join造句挺難的