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

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