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Message Posted: Thu, 11 Oct 2001 @ 18:45:58 GMT


     
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Subj:   Re: Posting Oracle trigger to Teradata
 
From:   Fred Pluebell

Rita Yung wrote:

  Are you implying that Teradata doesn't support stored procedure syntax [in a trigger]?  



Teradata triggers are more like a special form of Macro than a Stored Procedure.

From the V2R4 manual:

SQL_procedure_statement [specifies] one or more of the following triggered action statements:

o ABORT/ROLLBACK

o DELETE

o INSERT

o INSERT SELECT

o UPDATE

o A macro containing any combination (including none) of these valid statements can also be executed in a trigger.


Triggered action statements cannot act on the subject table because they cannot be recursive. Cascading triggers are bound by the same rule.



  Can I have multiple triggers defined for the same event?  


Yes; you declare ORDER values to control execution sequence.



  Otherwise, can a trigger call a macro?  


Yes, subject to the restrictions above. But note that macros don't support conditional processing (IF/END-IF) or cursor processing (SELECT _INTO) so that may not help in your situation.



  Can a trigger call a stored procedure?  


No.



     
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