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Best practices are generally and informally recognized as the methods and processes that have been shown over time to be superior to those achieved by other means.

4
votes
Fabian Pascal identifies four pragmatic criteria for choosing a key: familiarity, irreducibility, stability and simplicity. He also notes that sometimes you must make trade-offs. During the logical d …
answered Dec 9 '13 by Greenstone Walker
2
votes
When Codd formalised the null marker he wrote that it is a way of dealing with MISSING and INAPPLICABLE data. What you have here is a clear case of MISSING. As Kenneth correctly points out, it is not …
answered Mar 17 '13 by Greenstone Walker
103
votes
In addition to the points in other answers, here are some key differences between the two. Note: The error messages are from SQL Server 2012. Errors Violation of a unique constraint returns error …
answered Dec 16 '13 by Greenstone Walker