Maybe you want a search engine like KinoSearch or Plucene?

Or if you want to give the user full access to your database, just create a database user with limited permissions (like only SELECT, no UPDATE, INSERT etc.), and let them write the SQL themselves.

Or what is it that you want to achieve in the end?

In reply to Re: Database Search Format Engine by moritz
in thread Database Search Format Engine by Polyglot

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