Github user DaveBirdsall commented on a diff in the pull request:

    https://github.com/apache/trafodion/pull/1644#discussion_r202731971
  
    --- Diff: docs/sql_reference/src/asciidoc/_chapters/sql_statements.adoc ---
    @@ -3712,6 +3716,60 @@ ATTRIBUTES ALIGNED FORMAT
     --- SQL operation complete.
     ```
     
    +* This example demonstrates the character set of NCHAR column (_c1_) *cannot be specified*.
    --- End diff --
    
    I think one example is probably enough. The point we are trying to make is that "NATIONAL CHAR" implies a particular character set, namely, "UCS2". This is hard-coded into the product; it cannot be changed. Possible word-smith: "NATIONAL CHAR (or NCHAR) is a short-hand for CHAR ... CHARACTER SET UCS2. So it is not possible to specify a CHARACTER SET clause when using NCHAR, as the following example shows:"


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