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Re: SQL help needed

From: Mark Richard <mrichard_at_transurban.com.au>
Date: Tue, 16 Sep 2003 19:59:41 -0800
Message-ID: <F001.005D0158.20030916195941@fatcity.com> 






I guess I should have added some criteria like:



    
  
  1.   user_objects must have enough rows in it to cover the range (if not
consider some other table)

  
  2.   this will work fine up to a few thousand records (depending on the size
of your sever, etc) - it would work, but isn't ideal, when you move into
the millions of records range.

  
  3.   I guess a "where not exists (select 1 from table where linenbr =
therow)" type subquery could be written to reduce the sort size, but I
doubt performance would be much better.






Regards,


      Mark.




                                                                                                                                      
                      "Mark Richard"                                                                                                  
                      <mrichard_at_transur        To:       Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>                  
                      ban.com.au>              cc:                                                                                    
                      Sent by:                 Subject:  Re: SQL help needed                                                          
                      ml-errors_at_fatcity                                                                                               
                      .com                                                                                                            
                                                                                                                                      
                                                                                                                                      
                      17/09/2003 13:39                                                                                                
                      Please respond to                                                                                               
                      ORACLE-L                                                                                                        
                                                                                                                                      
                                                                                                                                      









Easy....



select rownum+minlinenbr-1 from user_objects where rownum <=
maxlinenbr-minlinenbr


minus


select linenbr from table



Replace the words with bind variables or whatever is appropriate for your
application.  Oh, and be sure to test it for accuracy - I'm typing without
testing and could be "out by one" on some of the maths.



Regards,


      Mark.






                      Kirtikumar Deshpande

                      <kirtikumar_deshpande        To:       Multiple
recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
                      @yahoo.com>                  cc:

                      Sent by:                     Subject:  SQL help
needed
                      ml-errors_at_fatcity.com



                      17/09/2003 13:29

                      Please respond to

                      ORACLE-L











Hello Listers,



I need some SQL help.


Not sure if this is possible in plain SQL or not, but here it is:
I have a table with two columns:


EMPNBR   LINENBR



------   -------


   100         1
   200         4
   300         8
   400         9
   500        14





How would I find out the missing linenbrs (2,3,5,6,7) if I was given
minlinenbr as 1 and


maxlinenbr as 10 that would be passed as variables (using &).



Thanks.






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Author: Mark Richard


  INET: mrichard_at_transurban.com.au


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Author: Mark Richard


  INET: mrichard_at_transurban.com.au


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Received on Tue Sep 16 2003 - 22:59:41 CDT












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