The SQL:2003 standard makes minor modifications to all parts of SQL:1999 (also known as SQL3), and officially introduces a few new features such as:[1]

    * XML-related features
    * window functions
    * the sequence generator, which allows standardized sequences
    * two new column types: auto-generated values and identity-columns
    * the new MERGE statement
    * extensions to the CREATE TABLE statement, to allow "CREATE TABLE AS" and "CREATE TABLE LIKE"
    * removal of the poorly-implemented "BIT" and "BIT VARYING" data types

 The sql2003 std latest draft is available here:
    http://www.wiscorp.com/sql_2003_standard.zip