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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"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:
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.