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relational join中文是什么意思

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  • Too many complex relational joins between too many tables can hinder performance
    太多表间的关系联接太多、太复杂可能会影响性能。
  • 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
    当连接条件中包含用户自定义的复杂函数时,原有的连接算法不能直接应用于该连接运算,为此,本文提出了限定变换函数t _ r概念,来限定连接谓词中某些变元的取值范围,从而避免对整个关系的扫描,达到提高连接算法性能的目的。
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Last modified time:Mon, 11 Aug 2025 00:29:56 GMT

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