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Message Posted: Wed, 16 Jan 2008 @ 17:23:40 GMT

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Subj:   Re: Convert time from twenty four hour to twelve hour format
From:   Geoffrey Rommel

  When doing a CAST, you can only convert the data to a data type, not a format.  

Sorry, Michael, but you are uncharacteristically mistaken. The original expression --

     cast(cast(HALF_HR_STRT_TM as format 'HH:MI:SSBT')
         as varchar())

does work. It is true, however, that formats and data types are not the same. In the inner cast, the data type is still TIME; thus the outer cast is necessary.

Perhaps you meant that using a format in place of a data type is not documented. As an extension, Teradata allows a data_type_list, which is "data type or data attributes or both". The manual gives no examples, but I take it that a format is a data attribute. If so, this usage is documented, although sketchily.

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