发明名称 |
Quasi-inverses of schema mappings |
摘要 |
A method and system for processing a schema mapping M from a source schema S to a target schema T by executing program code on a processor of a computer system. A schema mapping M′ from T to S is determined via processing the schema mapping M. The schema mapping M includes at least one constraint &sgr;. Each constraint &sgr; consists of a source-to-target tuple-generating dependencies (s-t tgd). The schema mapping M′ includes at least one constraint &sgr;′. Each constraint &sgr;′ consists of a disjunctive tgd with constants and inequalities among the constants. The schema mapping M′ is stored in at least one computer usable storage device of the computer system and/or is outputted in at least one output device of the computer system.
|
申请公布号 |
US7882151(B2) |
申请公布日期 |
2011.02.01 |
申请号 |
US20080061732 |
申请日期 |
2008.04.03 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
FAGIN RONALD;KOLAITIS PHOKION GERASIMOS;POPA LUCIAN;TAN WANG-CHIEW |
分类号 |
G06F7/00 |
主分类号 |
G06F7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|