Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

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oren@ravendb.net

+972 52-548-6969

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RavenDB Workshops - Deep dive into practical use of Document Data Modeling

Oct 02 2006

The really bad side of composite keys...

time to read 1 min | 141 words

No, I'm not going to talk about the hard to create/understand queries, performance, or maintainability. The really bad side of composite keys is that you get assoications using part of a key. Here is an example:

(Image from clipboard).png

Now, start working with the associations here. Payments are linked to salaries that falls within their date range and belong to the same employee. Needless to say, this breaks down FK support, so you will end up with bad data that you need to clean. No to mention that they queries that you need against this database are horrendous.

But, the wost thing that I saw was a relation between two tables that relied on the last N left-most unique characters in a string key.

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