Foundations of disjunctive logic programming
Foundations of disjunctive logic programming
An introduction to database systems (7th ed.)
An introduction to database systems (7th ed.)
Foundations of probabilistic answers to queries
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
Theory of Relational Databases
Theory of Relational Databases
White-box testing for database-driven applications: a requirements analysis
Proceedings of the Second International Workshop on Testing Database Systems
NULL 'Value' Algebras and Logics
Proceedings of the 2011 conference on Information Modelling and Knowledge Bases XXII
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In various writings over the past 20 years, such as [3], Date has pointed out that SQL produces incorrect answers to some queries where a null value is included in a table. In a recent article in the ACM SIGMOD Record, [8], Rubinson states that "Date misinterprets the meaning of his example query" and "SQL returns the correct answer to the query posed". The purpose of this article is to show that, contrary to Rubinson's claim, Date's critique of query evaluation in the presence of null values in SQL is completely justified.