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I have successfully used &&1, &&2, &&3, etc. in my SQLPlus query, and was wondering if it is possible to use this with any Oracle query, not just through SQLPlus?
What are these "variables" properly called?

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These are called, Substitution Variables. They are only for sqlplus. See reference documentation If you are referring to "other queries" such as withing PL/SQL, those use bind parameters.

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