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Message Posted: Fri, 03 Feb 2012 @ 09:51:23 GMT


     
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Subj:   Re: Use of Union with literals
 
From:   David Wellman

Hi,

When using a UNION (I think any of the set operators - UNION, UNION ALL, MINUS etc) the SELECT statement ** must ** reference a table. I think this is just an ANSI syntax requirement (but not sure).

If you don't have a table that should be used for the query then use one of the system ones, usually a view. Try any of the following:

     Select 'GE' as name
     FROM dbc.dbcinfo
     WHERE infokey = 'release'
     Union All
     Select 'ME' as name
     FROM dbc.dbcinfo
     WHERE infokey = 'release'

     Select 'GE' as name
     FROM dbc.databasesv
     WHERE databasename = user
     Union All
     Select 'ME' as name
     FROM dbc.databasesv
     WHERE databasename = user;

Of the two above options the first will probably perform better and should (!?!?!?!) run on any Teradata system currently being used.

Or of course create your own table with a UPI contaning one row.


Cheers,

Dave



     
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