this post was submitted on 11 May 2024
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Programming

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Benefits of a join table vs. array to express relations? (outside of SQL) (lemy.lol)
submitted 5 months ago by [email protected] to c/programming
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I am building an application that is using JSON / XML files to persist data. This is why I indicated "outside of SQL" in the title.

I understand one benefit of join tables is it makes querying easier with SQL syntax. Since I am using JSON as my storage, I do not have that benefit.

But are there any other benefits when using a separate join table when expressing a many-to-many relationship? The exact expression I want to express is one entity's dependency on another. I could do this by just having a "dependencies" field, which would be an array of the IDs of the dependencies.

This approach seems simpler to me than a separate table / entity to track the relation. Am I missing something?

Feel free to ask for more context.

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[–] [email protected] 1 points 5 months ago

SQL uses join tables to do what traditionally would have been done with dictionaries embedded in the objects. I.e. purpose made data structure. That approach is more efficient but less convenient than using a 3-way join.