具有空值的数据库关系

Proceedings of the 1st ACM SIGACT-SIGMOD symposium on Principles of database systems Pub Date : 1982-03-29 DOI:10.1145/588111.588117

C. Zaniolo

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引用次数: 299

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Database relations with null values

Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the ACM copyright notice and the title of the p&Ii&on and its date appear, and notice is given that copying is by permission of the Association for Computing Machinery. TO copy otherwise, or to republish, requires a fee and/or specific permission.

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Proceedings of the 1st ACM SIGACT-SIGMOD symposium on Principles of database systems

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