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Message Posted: Thu, 08 Jan 2004 @ 15:47:09 GMT


     
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Subj:   Re: The ORDER BY clause
 
From:   Victor Sokovin

  Given you had 4 columns in a table say "T1" and given a query  


  SELECT * FROM T1 order by 1,2,3,4;  


  Can the above query contain the following values in the ORDER BY clause  


  a. null  


  b. <= 0  


  c. > 4  


  d. repeating column specification i.e. ORDER BY 1,2,1  


  Case a. & d. give no error currently, but do they make sense, if so what.  


  Case b. & c. give error (this is correct - isn't it)  



I seem to remember that SQL-92 allowed repeated column positions in ORDER BY, as in d., but did not require the feature to be implemented. Repeated positions should be ignored. TD and Oracle used to follow that suggestion, Sybase did not and gave an error.

The feature might be appreciated by code generators who submit positions as variables and do not want to do a lot of checking.

I don't know about any changes in SQL-99.


Regards,

Victor



     
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