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Order by Decode( )

Posted on 2004-10-04
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Last Modified: 2010-05-18
I have a query created for a report that allows the user to select what information they wish to sort the end report by.  I uderstand that decode automatically type-casts the decode statement based on the first item decoded.  That is the problem: one of the items is a date field the rest are varchar2 fields if the date field is the first in the list then I cannot order by the other fields I get "literal does not match" or "expecting a number format..." if a varchar2 field is first in the list and the date field is selected to order by it is treated as a varchar and is not sorted properly.  Again I understand that is the way decode is supposed to work but there has to be a way around this.  I have tried to type cast from within the decode statement it does not work...at least not the way I tried.

select platform, engineer, end_date, part, complete_date, rcvd_date
from table
where....
order by (:sort, 'ENGINEER', engineer, 'EDD', end_date, 'PART', part)

the above will not correctly sort by end_date

select platform, engineer, end_date, part, complete_date, rcvd_date
from table
where....
order by (:sort,  'EDD', end_date, 'ENGINEER', engineer, 'PART', part)

the above will not correctly sort by engineer or part

any suggestions


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Question by:Barovian
2 Comments
 
LVL 20

Expert Comment

by:dsacker
ID: 12219058
Try:

order by decode(:sort,'ENGINEER',engineer,'EDD',to_char(end_date,'yyyymmddhh24miss'),'PART',part)

If you don't need the hours, take off the hh24miss.
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LVL 6

Accepted Solution

by:
izblank earned 2000 total points
ID: 12219151
Try this:

order by decode(:sort,  'EDD', end_date, NULL),
   decode(:sort, 'ENGINEER', engineer, NULL),
   decode(:sort, 'PART', part,NULL)
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