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Message Posted: Wed, 26 Jun 2002 @ 09:40:37 GMT


     
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Subj:   Ranking and concatenation
 
From:   Carmen Hofmann

Hi all,

I have a problem with the ranking function when grouping by to concatenated fields. Here is an easy examples for what happens:

Consider the follwing table:

   create table test
   (text1 char(10),
    text2 char(10),
    counts integer);

   insert into test values ('x','a',1);
   insert into test values ('x','b',2);
   insert into test values ('x','c',3);
   insert into test values ('y','a',4);
   insert into test values ('y','b',5);
   insert into test values ('y','c',6);

The following SELECT works fine:

   select text1,
          rank () over( order by sum(counts) desc)
   from test
   group by 1;

but when I concatenate the attributes it doesn't work:

   select (text1 || text2) mytext,
           rank () over( order by sum(counts) desc)
   from test
   group by 1;

Error is: 3706 - All expressions in a derived table must have an explicit name.

Is this the expected behaviour? (I don't think so...) If yes - why? Any ideas to manage this without physically storing the attribute text1 || text2?

Regards, Carmen.



     
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