Explain implicit and explicit curesor for example?

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  Hi experts,

  I met two terms which is null implicit and explicit null and I were confused.

  anyone can try to explain what that means exactly by both of these terms.

  Implicit-null I understood - it's the last jump announce a lambel in 3 to indicate that it as implicit-null

  Please suggest

  Concerning

  Mahesh

  Hello

  Explicit and implicit null labels are generated by the router to the last jump to its neighbors.

  Implicit null is the default which means penultimate router must only send IP packet thus, it appears the label (the label known as PHP and it is done to reduce the load on the router of the last jump to burst). One of the drawbacks in implicit null approach is if the network is configured for QoS based on MPLS EXP bits, QoS is lost between the penultimate router and router the last jump.

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  HTH.

  Arun

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• Ref Cursor on implicit and explicit cursors

  Hello
  
  In my company the drafting of PL/SQL procedure, everyone uses "Ref Cursor",
  But the article below, said implicit is the best, then Explicit and Ref Cursor...
  
  [http://www.oracle-base.com/forums/viewtopic.php?f=2 & t = 10720]
  
  I'm a bit confused by this, can someone help me understand this?
  
  Thank you

  SeshuGiri wrote:

  In my company the drafting of PL/SQL procedure, everyone uses "Ref Cursor",
  But the article below, said implicit is the best, then Explicit and Ref Cursor...

  [http://www.oracle-base.com/forums/viewtopic.php?f=2&t=10720]

  I'm a bit confused by this, can someone help me understand this?

  It has performance and it has performance...

  To explain. There is one type of cursor in Oracle - that is the cursor which is analyzed and compiled by the SQL engine and stored in the shared the database pool. The "+ client +" then receives a handle (called a SQL statement handle of many APIs) that can be used to make reference to this slider in the SQL engine.

  The performance of this slider is not determined by the customer. It is determined by the execution plan and how much enforcement of this slider cost ito of server resources.

  The customer can be Java, VB, .net - or a PL/SQL program. This client language (SQL client), has its own structures dealing with this from the SQL engine cursor handle.

  It can hide by the developer all together - so that they can't even see that there is a statement handle. That's what the implicit cursors in PL/SQL.

  It can allow the developer to manually define the structure of slider - this is what the explicit cursors, ref Cursor and DBMS_SQL cursors in PL/SQL.

  Each of these client cursor structures provides the programmer with a set of features to address different SQL cursor. Explicit cursor in PL/SQL constructs do not have the use of dynamic SQL statements. REF CURSOR and cursors DBMS_SQL do. REF CURSOR does not allow the programmer determine, at runtime, the structure of the projection of the cursor SQL. DBMS_SQL sliders do.

  Only ref Cursor can be created in PL/SQL and then handed over to another client (for example, Java/VB) for treatment. Etc.

  If each of the works of art/customer interfaces gives you a different feature for SQL cursors.

  Choose the implicit cursors for example does not the SQL cursor move faster. The SQL engine does not know and does not care, which customer construct you use to deal with the SQL cursor handle, he gave you. It does not matter. It does not affect his performance of cursor SQL.

  But on the client side, it can matter - if your code when dealing with that SQL cursor determines how fast your interaction with this SQL cursor is. How many context changes you make. How you use and reuse the SQL (for example hard vs soft analysis vs analysis reusing the same cursor handle). Etc.

  Are there any unique client cursor construction which is better? N °

  It's ignorant views. The customer's language provides a box tool, where each tool has a specific application. The competent developer will use the right tool for the job. The stupid developer will select a tool and use it as The Hammer to 'solve' all problems.

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• Question about GROUP BY and double aggregation for example MAX (AVG (val))

  Good evening/morning,
  
  I am struggling with what is probably a simple problem.
  
  The objective of the exercise is to display the highest average earnings and his Department (with the EMP table).
  
  Easy to get the maximum average wage:
  

  select max(avg(sal)) as max_avg_sal
    from emp
   group by deptno;

  I could not figure out how to change this query to get the deptno associated AVG. max. Gave up on changing this query and came to this:
  

  select deptno,
         avg_sal as max_avg_sal
    from (
          select deptno,
                 avg(sal) as avg_sal
            from emp
           group by deptno
           --
           -- order causes 1st row to have the max(avg(sal))
           -- this will be exploited in the where of the outer query
           --
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         )
   --
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   --
   where rownum <= 1;

  This works, but feels pretty disappointing compared to the simplicity of the first query (which I couldn't the deptno on.) That is the request more simple with that I could come.
  
  The QUESTION is:
  
  The query above is really the way simpler and easier to get the maximum average and its associated department number? If it isn't, I'm more interested in your simplest solution. :)
  
  Could someone to laugh at one of the alternatives that I came up with a "simpler": solution
  

  with x as
    (
     select deptno,
            avg(sal) as avg_sal
       from emp
      group by deptno
    ),
    max_avg_sal as
    (
     select max(avg_sal)                  as asmax
       from x
    ),
    deptno_max as
    (
     select deptno                        as dnmax
       from x where avg_sal = (select asmax from max_avg_sal)
    )
  select (select asmax from max_avg_sal) as max_avg_sal,
         (select dnmax from deptno_max)  as deptno_max
    from dual;

  The road to hell is simple, it is paved from selects < chuckle >,.
  
  Thank you for helping,
  
  John.

  Hello
  Try this

  SELECT MAX(AVG(sal)) AS max_avg_sal,
         MAX(DEPTNO) KEEP (DENSE_RANK FIRST ORDER BY AVG(SAL) DESC )  DEPTNO
  FROM scott.emp
  GROUP BY deptno
  

  Kind regards
  Anthony Alix

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