Abstract
In this chapter, you’ll learn all about a concept in SQL and databases called “null.” In the sample table you've been using, every record has a value for every column. However, when working with real databases, this is not always the case. The concept of “null” is used when data is not known.
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© 2019 Ben Brumm
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Brumm, B. (2019). Working with Nulls. In: Beginning Oracle SQL for Oracle Database 18c. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-4430-2_8
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DOI: https://doi.org/10.1007/978-1-4842-4430-2_8
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Publisher Name: Apress, Berkeley, CA
Print ISBN: 978-1-4842-4429-6
Online ISBN: 978-1-4842-4430-2
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