Abstract
If a database has been designed correctly, the data will be located in several different tables. For example, our golf database has separate tables for information about members, teams, and tournaments, as well as tables that connect these values; for example, which members play on which teams, enter which tournaments, and so on. To make the best use of our data, we will need to inspect values from different tables to retrieve the information we require.
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Notes
- 1.
In the formal terms of relational algebra, retrieving a subset of rows (tuples) from a table (relation) is known as the select operation and retrieving a subset of attributes (columns) is known as the project operation. See Appendix 2 for more information.
- 2.
- 3.
Formally, in terms of relational algebra, the result of every operation will generate another relation or set of unique rows. See Appendix 2 for more information.
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© 2016 Clare Churcher
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Churcher, C. (2016). Simple Queries on One Table. In: Beginning SQL Queries. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-1955-3_2
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DOI: https://doi.org/10.1007/978-1-4842-1955-3_2
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Publisher Name: Apress, Berkeley, CA
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