Thanks Carlos.
For the second question, I agree with you that the collations control the ordering. But how could i know the setting in current session.
For example, If the encoding is ASCII, 'a'(97) is greater than '3'(51) while 'a'(129) is less than '3'(243) if the encoding is EBCDIC. Well, I will do a little researching about this for Teradata.
Thanks,
RR
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