Description of the illustration rank_aggregate.eps
RANK(expr [, expr ]...) WITHIN GROUP (ORDER BY expr [ DESC | ASC ] [ NULLS { FIRST | LAST } ] [, expr [ DESC | ASC ] [ NULLS { FIRST | LAST } ] ]... )
RANK(expr [, expr ]...) WITHIN GROUP (ORDER BY expr [ DESC | ASC ] [ NULLS { FIRST | LAST } ] [, expr [ DESC | ASC ] [ NULLS { FIRST | LAST } ] ]... )