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 sigma. Each constraint sigma consists of a source-to-target tuple-generating dependencies (s-t tgd). The schema mapping M' includes at least one constraint sigma'. Each constraint sigma' 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.
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申请公布号 |
US2009177672(A1) |
申请公布日期 |
2009.07.09 |
申请号 |
US20080061732 |
申请日期 |
2008.04.03 |
申请人 |
FAGIN RONALD;KOLAITIS PHOKION GERASIMOS;POPA LUCIAN;TAN WANG-CHIEW |
发明人 |
FAGIN RONALD;KOLAITIS PHOKION GERASIMOS;POPA LUCIAN;TAN WANG-CHIEW |
分类号 |
G06F17/00 |
主分类号 |
G06F17/00 |
代理机构 |
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代理人 |
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地址 |
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