Not's not just outdated, its wrong (in context of question 2) which is about indexing both, `where` and `order by` clauses. In that case you must provide a sing

Not's not just outdated, its wrong (in context of question 2) which is about indexing both, `where` and `order by` clauses. In that case you must provide a single index to benefit from the index order (so that the database doesn't actually need to perform a sort operation).