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设有一个SPJ数据库，包括S，P，J，SPJ四个关系模式,用关系代数完成查询和用SQL完成各项操作-SPJ has a database, including S, P, J, SPJ four model, using relational algebra and the use of SQL query to complete the operation completed
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transformation of sql query into relational algebra
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数据库书籍课件，详细讲解了范式的规范化、关系代数和SQL的简单操作-Courseware database of books, gave a detailed standardized paradigm, relational algebra and SQL, simple operation
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数据库中关系代数的优化算法，只是算法，不是完整的程序-Database optimization relational algebra, just algorithms, not the complete program
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用matlab实现了基于关系代数理论的关联规则挖掘算法ORAR-A the mining algorithm ORAR association rules based on relational algebra theory using matlab
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关系代数，关系演算和关系模型的学习课件，用于对数据库系统的入门指导。-Relational algebra, relational calculus and the relational model of learning courseware for introductory guide for database systems.
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由于关系代数运算的结果与其输入的类型一样，仍为关系，所以我们可以把多个关系代数运算组合成一个关系代数表达式。-As a result of relational algebra operations as its input type, still relationship, so we can combine multiple relational algebra into a relational algebra expression
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数据库关系代数作业,包含4章数据库的ppt资料文件-Database relational algebra operations, including Chapter 4 ppt file information
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Abstract:
Map-Reduce is a programming model that enables easy development of scalable parallel applications to process vast amounts of data on large clusters of commodity machines. Through a simple interface with two functions, map and reduce, this
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