Recently, the use of Nulls in relational database has been called into question by C. J. Date and other writers. They have suggested various schemes for using default values as a replacement for Null processing in relational database.
This paper examines these issues in detail, presenting both sides of the controversy. Are Nulls a problem similar to Dykstra's 'Goto's considered harmful.', or are they an effective, useful technique for dealing with missing information? There are many, including E. F. Codd, the father of relational database, who believe Nulls are the right solution for databases.
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