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Add qualifier functions; bump to PHP 8.5

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Daniel J. Summers
2026-01-24 14:58:02 -05:00
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docs/advanced/related.md
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## Overview
Document stores generally have fewer relationships than traditional relational databases, particularly those that arise when data is structured in [Third Normal Form][tnf]; related collections are stored in the document, and ever-increasing surrogate keys (_a la_ sequences and such) do not play well with distributed data. Unless all data is stored in a single document, though, there will still be a natural relation between documents.
Document stores generally have fewer relationships than traditional relational databases, particularly those that arise when data is structured in [Third Normal Form][tnf]; related collections are stored in the document, and ever-increasing surrogate keys (_à la_ sequences and such) do not play well with distributed data. Unless all data is stored in a single document, though, there will still be a natural relation between documents.
Thinking back to our earlier examples, we did not store the collection of rooms in each hotel's document; each room is its own document and contains the ID of the hotel as one of its properties.