Abstract
No new concepts are presented here that have not been discussed previously—it is just the notation that is different. The more formal notation allows queries to be expressed very concisely, and the underlying mathematics can be useful when dealing with complex situations. We will use the database described in Appendix 1 for the examples.
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Notes
- 1.
The relational theory was first introduced by the mathematician E. F. Codd in June 1970 in his article “A Relational Model of Data for Large Shared Data Banks” in Communications of the ACM: 13, pp. 377–387.
- 2.
For example: Databases in Depth: Relational Theory for Practitioners by C.J. Date (City, state: O’Reilly, 2005).
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© 2016 Clare Churcher
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Churcher, C. (2016). Relational Notation. In: Beginning SQL Queries. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-1955-3_14
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DOI: https://doi.org/10.1007/978-1-4842-1955-3_14
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Publisher Name: Apress, Berkeley, CA
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