| 部分相容关系的集合运算及其在数据库查询语言中的应用 |
| |
| 引用本文： | 刘路放,赫孝良.部分相容关系的集合运算及其在数据库查询语言中的应用[J].西安交通大学学报,1995,29(2):42-47. |
| |
| 作者姓名： | 刘路放 赫孝良 |
| |
| 摘 要： | 将同类关系上的运算交、并、差以及对乐差扩充到非同类关系上，同时引入了一个新的关系运算－拼接，并对以上各运算的性质进行了讨论，最后，介绍了这些运算在关系数据库子模式查询语言ＶＱＬ中的应用。
|
| 关 键 词： | 关系数据库 查询语言 相容关系 集合运算 |
THE BOOLEAN OPERATIONS OF PARTIAL COMPATIBLE RELATION AND THEIR APPLICATION IN SUBSCHEMA QUERY LANGUAGE |
| |
| Liu Lufang, He Xiaoliang.THE BOOLEAN OPERATIONS OF PARTIAL COMPATIBLE RELATION AND THEIR APPLICATION IN SUBSCHEMA QUERY LANGUAGE[J].Journal of Xi'an Jiaotong University,1995,29(2):42-47. |
| |
| Authors: | Liu Lufang He Xiaoliang |
| |
| Institution: | Liu Lufang; He Xiaoliang(School of Electronlcs and Information Engineering) (School of Sciences) |
| |
| Abstract: | In this paper,the boolean operations of relation such as INTERSECTION,UNION,DIFFERENCE and SYMMETRIC DIFFERENCF are extended to incompatible relation,anda new operation named TOGETHER is introduced.Their characters are discussed and their applications in subschema query language are introduced. |
| |
| Keywords: | relation relation operation relational databases query language |
| 本文献已被 CNKI 维普 等数据库收录！ |
