悬挂
发表于 2025-3-23 13:35:52
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leniency
发表于 2025-3-23 17:48:00
https://doi.org/10.1007/3-540-60794-3(GIS); Abgbfrageoptimierung; Constraint Databases; Constraint Datenbanken; Constraint Processing; Constra
不足的东西
发表于 2025-3-23 18:25:42
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小故事
发表于 2025-3-24 02:02:08
DISCO: A constraint database system with sets,talog queries and input databases with both integer gap-order and set order constraints . The DISCO query language can easily express many complex problems involving sets. The paper also presents efficient running times for several sample queries.
和谐
发表于 2025-3-24 03:35:27
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大方一点
发表于 2025-3-24 07:34:35
Constraint Databases and Applications978-3-540-49456-0Series ISSN 0302-9743 Series E-ISSN 1611-3349
GULF
发表于 2025-3-24 13:48:18
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CRACK
发表于 2025-3-24 14:50:33
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Hypomania
发表于 2025-3-24 19:49:32
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occurrence
发表于 2025-3-25 03:10:34
Ambiguity for referential integrity is undecidable,he former case rollback the operation. Since such checks are time consuming, one might consider performing them only for schemas which bear the risk of an indeterminism. This paper shows that it is . whether or not a schema may have an instance leading to ambiguities. Therefore, unnecessary checks cannot be avoided in general.