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Home arrow Tips and Tricks arrow ABAP Reports arrow SELECT distinct usage!!!
SELECT distinct usage!!! PDF Print E-mail
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Written by Anon.   
Friday, 09 March 2007
The DISTINCT addition to the SELECT statement allows you to remove duplicates from a set of results during a SELECT.

DON'T 

    SELECT DISTINCT MATNR
           FROM MARC
           INTO TABLE T_MARC
           WHERE DISMM = 'ND'.
    
Disadvantages:

  • Requires sorting on database server and adversely affects overall system performance if no index can be used
  • When using DISTINCT the database is always accessed directly by passing the SAP buffer

DO    

Alternative approach:
    SELECT MATNR
           FROM MARC
           INTO TABLE T_MARC
           WHERE DISMM = 'ND'.
    SORT T_MARC BY MATNR.
    DELETE ADJACENT DUPLICATES FROM T_MATNR COMPARING MATNR.
    
Recommendation:

  • Only use the DISTINCT addition if there are a large number of duplicates and the set of results will be significantly reduced if you remove duplicates.
  • Use DISTINCT if the selected fields are part of DB index picked by WHERE clause of the SELECT.

 


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