“relational calculus language”的概念、定义、翻译、参考文献-科学参考

单词	relational calculus language
释义	relational calculus language [ri`lā·shǝn·ǝl `kal·kyǝ·lǝs ´laŋ·gwij] ^{COMPUTER SCIENCE} A higher-level nonprocedural language for operating on a data base of relations, containing statements that can be mapped to the fundamental algebraic operations on the database.
随便看	echo area echo attenuation echo box echocardiography echo chamber echo check echo contour echoencephalograph echo frequency echogram echograph echo intensity echolalia echolic echo location echo matching echophrasia echoplex technique echo power echopraxia echo pulse echo ranging echo-ranging sonar echo recognition echo repeater

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