An expression in the SELECT list that specifies how result sets are sorted. If you do not use this clause, result rows are returned unsorted.
The ORDER BY clause is ANSI SQL:2011-compliant with extensions. The specification of an ORDER BY clause in the definition of an updatable cursor is ANSI SQL:2011-compliant.
The specification of an expression as an ordering argument in the ORDER BY clause is a Teradata extension to the ANSI SQL:2011 standard.