# SQL Antipatterns, Volume 1: 5th normal form and compound key (page 333)

**URL:** <https://forum.devtalk.com/t/sql-antipatterns-volume-1-5th-normal-form-and-compound-key-page-333/81456>\
**Category:** PragProg Customers\
**Tags:** book-sql-antipatterns-volume-1, question\
**Created:** [5 November 2022 08:56 UTC](https://forum.devtalk.com/t/sql-antipatterns-volume-1-5th-normal-form-and-compound-key-page-333/81456 "2022-11-05T08:56:20Z")\
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**Author:** ![billkarwin](https://forum.devtalk.com/user_avatar/forum.devtalk.com/billkarwin/32/3276_2.png) [@billkarwin](https://forum.devtalk.com/u/billkarwin)\
**Post date:** [7 November 2022 21:15 UTC](https://forum.devtalk.com/t/sql-antipatterns-volume-1-5th-normal-form-and-compound-key-page-333/81456/2 "2022-11-07T21:15:30Z")

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Yes, the table in this section has a compound key. A table with no compound key is implicitly in fifth normal form, so that would not be a good example of a table that needs to be fixed to satisfy fifth normal form. The first paragraph should be more clear that only a table that needs to be fixed is shown.

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