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I want to know if there is a way to use a user-defined variable in WHERE clause, as in this example:
SELECT id, location, @id := 10 FROM songs WHERE id = @id
This query runs with no errors but doesn’t work as expected.
Not far from what Mike E. proposed, but one statement:
I used similar queries to emulate window functions in MySQL. E.g. Row sampling – just an example of using variables in the same statement