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Database/SQL Database Modeling and Design, Fifth Edition: Logical Design, 5 edition
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Database/SQL BusinessObjects: The Complete Reference
Database/SQL Free 15000000 ebooks,softwares,movies,wallpapers free download
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Database/SQL 网页数据库整合精华录
Database/SQL Oracle 数据库培训手册—DBA
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Database/SQL SQLite权威指南
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Database/SQL Microsoft Access Developer's Guide to SQL Server [Paperback]
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Database/SQL 数据库系统概论答案第四版
Posted on 2010-06-17
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1 .试述数据、数据库、数据库系统、数据库管理系统的概念。答:( l )数据( Data ) :描述事物的符号记录称为数据。数据的种类有数字、文字、图形、图像、声音、正文等。数据与其语义是不可分的。解析在现代计算机系统中数据的概念是广义的。早期的计算机系统主要用于科学计算,处理的数据是整数、实数、浮点数等传统数学中的数据。现代计算机能存储和处理的对象十分广泛,表示这些对象的数据也越来越复杂。数据与其语义是不可分的。 500 这个数字可以表示一件物品的价格是 500 元,也可以表示一个学术会议参加的人数有 500 人,还可以表示一袋奶粉重 500 克。
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