Any difference between the two queries

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  Alexandre Gelin says:
  function separate and aggregation are for different uses and can give the same result, but if you use the aggregate function to get the separate records, it will be expensive...

  really? I find them almost identical to 11g. Actually GROUP BY is almost always more fast for me in the old days.

  article about this askTom Re: any difference between the separate function and aggregation in sql query cost?
  This applies mainly to the older oracle versions http://www.oracle.com/technology/products/rdb/pdf/distinct_derivedtables_groupby_sort_tech_article.pdf

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• Pls tell me the difference between the 2 queries which is related with PIVOT

  Hi all
  
  While I was looking for the use of the PIVOT operator, in one of the sites I've found the following query is requested to run
  

  SELECT  *
    FROM  (SELECT job,
                  sum(decode(deptno,10,sal)) DEPT10,
                  sum(decode(deptno,20,sal)) DEPT20,
                  sum(decode(deptno,30,sal)) DEPT30,
                  sum(decode(deptno,40,sal)) DEPT40
             FROM scott.emp
         GROUP BY job)
  ORDER BY 1;

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  SELECT job,
                  sum(decode(deptno,10,sal)) DEPT10,
                  sum(decode(deptno,20,sal)) DEPT20,
                  sum(decode(deptno,30,sal)) DEPT30,
                  sum(decode(deptno,40,sal)) DEPT40
             FROM scott.emp
         GROUP BY job

  We see that for the two motions, I get the same output as follows:
  

  JOB     DEPT10     DEPT20     DEPT30     DEPT40
  ANALYST          6000          
  CLERK     1300     1900     950     
  MANAGER     2450     2975     2850     
  PRESIDENT     5000               
  SALESMAN               5600     

  could you pls tell me what is the exact difference between 2 requests above and in which respective cases, those that should be used?
  
  Kind regards
  
  Yamen
  
  Published by: Francis 22 Sep, 2009 11:07

  Hello

  SELECT  *
    FROM  (SELECT .........................)
  

  I would quote the internal sql as subquery for my reference in this post.
  That is to say.

  Select * from (subquery)

  You'd be using the way above for many reasons, some grounds are
  (1) you want to display only some columns of all the columns in the subquery (less required by anyone)
  for example

  select first_name, last_name, salary from
        (select first_name, last_name, salary, dept_id, manager from ......)
  

  (2) you want to view / use a few lines on all the rows in the subquery (filtering of lines)

  for example

  select * from
      (select first_name, last_name, salary, dept_id, manager from .....)
     where salary > 5000
  

  (3) you want to reach the exit of with another table subquery

  for example

  select * from
      (select first_name, last_name, salary, dept_id, manager from ......) e,
      department d
      where d.dept_id = e.dept_id
  

  (4) you wish to the output to the format/total of subquery as the use of group by or order by

  for example

  select max(salary), dept_id
      from (select first_name, last_name, salary, dept_id, manager from .....)
      group by dept_id
       order by dept_id
  

  Concerning
  Anurag

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