relational join 中文意思是什麼

relational join 解釋
關系合併
  • relational : adj. 有關系的；親戚的；（特指語法上）表示關系的。adv. -ly
  • join : vt 1 接合，連接，使結合。2 參加，加入，作（團體等的）成員；和（某人）作伴。3 回（原崗位），歸（隊...
  1. A relationship is analogous to a join path that might exist between primary and foreign key columns in a relational database

    關系類似於可能存在於關系數據庫中的主鍵列和外鍵列之間的聯接路徑。
  2. Based on the reference feature of object - relational data model and the query language, the join algorithm sort - loops, probe - loops and segment - join are proposed, their performance are analyzed and compared

    針對對象關系數據模型和查詢語言所支持的引用特性，設計了基於引用的連接演算法sort - loops 、 probe - loops以及segment - join 。
  3. 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

    當連接條件中包含用戶自定義的復雜函數時，原有的連接演算法不能直接應用於該連接運算，為此，本文提出了限定變換函數t _ r概念，來限定連接謂詞中某些變元的取值范圍，從而避免對整個關系的掃描，達到提高連接演算法性能的目的。
分享友人
分享到 Line

分享到臉書