Row numbering, ranking: how to use LESS user variables in MySQL queries

Row numbering, ranking: how to use LESS user variables in MySQL queries

User variables, even though not part of standard SQL, are great objects in MySQL. They allow to keep some “state” for the life of a session: a session can execute a statement to compute a value, store that value in a user variable, and use it in all next  statements.…

Source: Row numbering, ranking: how to use LESS user variables in MySQL queries

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