FELON
发表于 2025-3-28 16:51:23
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军械库
发表于 2025-3-28 20:58:15
Integrity Constraints,cs, which is rather simple compared with other database models such as the relational model, the network model or the hierarchical model. One lesson learned in the relational model is that it is not necessary to develop the theory of dependency classes and then apply it to the defined types. Instead
琐碎
发表于 2025-3-29 01:32:46
Operations,uct and difference. Additionally uses relationship join, product, reduction, compression, renaming, simplification and the value selection operators .. and ... These operations are too powerful for generation of generic queries. A similar system is used in . As far as we
开始没有
发表于 2025-3-29 03:23:00
Applying the Theory,aradigms in a simple manner thus making them understandable and usable, even for beginners. The model is theoretically based, as we have demonstrated in the case of integrity constraints. In the same way the semantics of operations and the behavior of the database can be expressed using an evolving
补角
发表于 2025-3-29 08:56:23
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invulnerable
发表于 2025-3-29 14:49:53
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SEVER
发表于 2025-3-29 17:12:52
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构成
发表于 2025-3-29 23:02:49
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Decimate
发表于 2025-3-30 02:17:42
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