sql query problem

Posted by benjamin button on Stack Overflow See other posts from Stack Overflow or by benjamin button
Published on 2010-04-29T15:08:37Z Indexed on 2010/04/29 15:27 UTC
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why this query give me an error:ORA-01790

SELECT TO_CHAR(logical_date,'MM') MONTH
       FROM logical_date WHERE logical_date_type='B'        
UNION 
SELECT 
        TO_CHAR(logical_date,'MM')+1 MONTH
        FROM logical_date WHERE logical_date_type='B'

but when i run them separately,they give the proper output.

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