The Hunt for a Red Spider: Conjunctive Query Determinacy Is Undecidable
The Hunt for a Red Spider: Conjunctive Query Determinacy Is Undecidable
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DOI:
10.1109/lics.2015.35
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发表时间:
2015-01
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影响因子:
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通讯作者:
Tomasz Gogacz;J. Marcinkowski
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文献类型:
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作者:
Tomasz Gogacz;J. Marcinkowski
We solve a well known, long-standing open problem in relational databases theory, showing that the conjunctive query determinacy problem (in its "unrestricted" version) is undecidable.