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For a theoretical database paper i tried to figure out if there is a is general symbol for an arbitrary Query that is used in literature. Can anyone tell me if there is any symbol?

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    I don't think there is such a thing as an arbitrary query. It kind of makes all the difference in the world regarding what you want to accomplish with a database. In any case, you may have better luck with this over on Academia.se if there's a formal academic answer at all. – John Eisbrener Mar 18 at 14:23
  • Have you looked at this Wikipedia page – HandyD Mar 21 at 7:32
  • I know Relational algebra as well as this page. And it does not answer my question sorry. – Bierbarbar Mar 22 at 9:27
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    I'm not really sure if this is what you are looking for but based on the book (Algorithms and Theory of Computation Handbook, Volume 2: Special Topics and Techniques (Chapman & Hall/CRC Applied Algorithms and Data Structures series)) I generally use q – armitage Mar 22 at 15:21
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    Arbitrary query in what notation? There isn't. One sometimes sees (as sometimes in logic) Φ for a query or Φ(x,...) for a query with free variables or attributes x,.... Find a presentation related to your own & follow it. Eg one you reference. It doesn't matter anyway. A name denotes what you say it denotes. – philipxy Mar 24 at 19:28
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"Query" can mean almost anything - retrieving data, dropping a database, running a backup. However, most commonly it's used to retrieve data, and from a user's perspective the most relevant aspect is the filters they use. So I suggest this symbol:

A stylized funnel

This is used in common non-specialist applications like Excel and Access for filtering data. It's not exact, but it may work for the context you have in mind.

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