| 术语 | relational algebra |
| 释义 | relational algebra 关系代数 In relational database, a language that provides a set of operators for manipulating relations, e.g., if there were two relations R1 (employee number, employee department) and R2 (employee number, project) and a user required to know which departments were involved with a given project then a set of operations would be specified and the resulting relation would comprise a table of departments associated with the project. 关系型数据库中使用的一种语言，提供了一组处理各种关系式的算符。例如，存在两个关系R1(雇员号，雇员部门)和R2(雇员号，项目)，而某个用户需要知道哪 些部门和给定的项目有关，对此应给出一组运算，并给出一个与项目有关的部门的表格的相 关结果。 参阅join, projection, relation, relational calculus。 |
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