Conor wrote:
SELECT EXISTS (SELECT 1 FROM access_control WHERE (path = '/a' OR path LIKE 
'/a/%') AND user = :user AND permission = :permission)

Most materialized path queries use LIKE a lot. As long as you keep the % character at the end, a good DB will be able to use an index to speed up the query.

Ah, of course, many thanks! :-)

Chris

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