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Message Posted: Fri, 12 May 2005 @ 23:12:04 GMT


     
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Subj:   Re: Using MLoad to update several columns
 
From:   McCall, Glenn David

You might try using a case statement

     update employee
     set first_name = :first_name,
        last_name = case when last_name = 'abcd' then :last_name else last_name
     end
     where emp_id = :emp_id;

I would also encourage you to look at conditional apply statements (although it won't work for your example) - refer to .import in the mload manual.

With these you can do something like this

     .import blah blah blah
         APPLY update_both_names where :last_name = 'abcd'
         APPLY update_firt_name_only where :last_name <> 'abcd';

This might be overkill for this example, but you can do things like load data into different tables.

This conditional apply is tested against the incoming data from your data source not data already in the database. It doesn't check content that is already in the database. So if the last_name was 'abcd' in the data source, you could use conditional apply's to control what tables were updated according to whatever rules you needed.


Hope this helps.

Glenn Mc



     
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