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m →When two nulls are equal: grouping, sorting, and some set operations: Minor corrections in English |
Citation bot (talk | contribs) Removed URL that duplicated identifier. | Use this bot. Report bugs. | Suggested by Dominic3203 | #UCB_webform 371/3850 |
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* {{Cite journal | last1 = Codd | first1 = E. F. | title = Extending the database relational model to capture more meaning | doi = 10.1145/320107.320109 | journal = ACM Transactions on Database Systems | volume = 4 | issue = 4 | pages = 397–434 | year = 1979 | citeseerx = 10.1.1.508.5701 | s2cid = 17517212 }} Especially §2.3.
* {{cite book|author-link=C.J. Date|last=Date|first=C.J.|year=2000|title=The Database Relational Model: A Retrospective Review and Analysis: A Historical Account and Assessment of E. F. Codd's Contribution to the Field of Database Technology|publisher=[[Pearson PLC|Addison Wesley Longman]]|isbn=978-0-201-61294-3|url=https://archive.org/details/databaserelation00date}}
* {{cite journal | last1 = Klein | first1 = Hans-Joachim | year = 1994 | title = How to modify SQL queries in order to guarantee sure answers
* Claude Rubinson, [http://www.u.arizona.edu/~rubinson/scrawl/Rubinson.2007.Nulls_Three-Valued_Logic_and_Ambiguity_in_SQL.pdf Nulls, Three-Valued Logic, and Ambiguity in SQL: Critiquing Date's Critique] {{Webarchive|url=https://web.archive.org/web/20160305071445/http://www.u.arizona.edu/~rubinson/scrawl/Rubinson.2007.Nulls_Three-Valued_Logic_and_Ambiguity_in_SQL.pdf |date=2016-03-05 }}, SIGMOD Record, December 2007 (Vol. 36, No. 4)
* John Grant, [http://www09.sigmod.org/sigmod/record/issues/0809/p23.grant.pdf Null Values in SQL]. SIGMOD Record, September 2008 (Vol. 37, No. 3)
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