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Asked: 2026-05-11T08:32:29+00:00

So I have an address table that is shared among various other tables, such

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So I have an address table that is shared among various other tables, such as schools, parks, churches, etc. Schools, parks, etc all foreign key to a row in address.

What I’m wondering is, if I have a specific row in the address table, is there a way to find out which row in which table points to it. So basically just this:

SELECT * FROM schools WHERE address_id = 1

But that would mean I would have to know that the address in row 1 is connected to a school. But what if I don’t know that? It could be 1 of 10 other tables…

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1 Answer

  1. You’re going to have to query each of the other tables.

    I would do it as a UNION query:

      SELECT id, 'schools' as whichTable from schools where address_id=1   UNION   SELECT id, 'parks' as whichTable from parks where address_id=1   UNION   ...

    so that you only have to run one query and get back the results as a single dataset that you work with.

    If you have a list of tables (or a table of tables), you could generate the query programmaticly — that would save you having to update your query when the tables are changed.

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