the MINUS in SQL operator

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• order of the sql operation

  Hi experts,

  I want to erase my basics here.

  I want to know the order of the sql operation.

  in fact the problem with me I've read websites and different blog

  on the order of operation of sqkl requests, so I'm confused here.

  I think that the order of operation iis

  -MY assumptuion-

  Of

  |

  where

  |

  Group

  |

  having

  |

  Select

  |

  order by

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

  My assupmtion is correct?

  If so, then if suppose there is clause rownum in my selection criteria, when

  It will apply?

  on some sites I've seen criteria below

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

  1. FROM/WHERE clause goes first.

  2 ROWNUM is assigned and incremented for each line of output FROM/WHERE clause.

  3. SELECT is applied.

  4 GROUP BY is applied.

  5 WHO is applied.

  6 ORDER BY is applied.

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

  is that correct or my assumption is correct?

  Thank you very much in advance... !!

  Kind regards

  Prashant

  Hello

  969262 wrote:

  Hello

  I'm more confused now that everyone has to give a different answer...:)

  Blushadow said something that can really help you:

  Queries are not always run in a linear fashion

  Once you see a step by step ordered arrangement, it is (at best) how things looked from a point of view, and it can be useful to understand some aspects of the work of the database, but not all.

  If you must have a single ordered list, so what you posted first is, according to me, the more accurate for the majority of cases:

  1. Of
  2. where
  3. Group
  4. having
  5. Select
  6. order by

  This can help you understand logically how to write SQL statements and predict their outcome.  For example, think that, when it happens before that GROUP BY allows to remember that you can not use an aggregate function, such as COUNT in a WHERE clause, because the aggregate functions are calculated as part of the process GROUP.

  How to write a SQL statement and how the optimizer decides to pay in fact, are two different things.  The optimizer do not follow the sequence posted above, or any other sequence of steps.  To see how a particular statement is made, given some data in particular, there is no substitute for watching the execution plan.

• Dblink Oracle to sql server, multiple database on the same server sql under a dblink

  Hi, we managed to set up an Oracle dblink to sql server and retrieve data.

  The user of sql server have been using via dblink has access to multiple databases on the same sql server

  But the question is how in oracle (if possible) prepend you the SQL access to this?

  For example:

  Sqlserver_prod has the user sqlserver_user which seems to be set up as default database sqlserver_db1

  But we have select access to sqlserver_db2

  all work well as sqlserver_user

  Select * from table_fromdb1

  Select * from dbo.table_fromdb1

  Select * from sqlserver_db1.dbo.table_fromdb1

  as does

  Select * from sqlserver_db2.dbo.table_fromdb2

  more in Oracle

  Oracle_db a dblink sqlserver_prod. World connection sqlserver_user

  everything works fine

  Select * from 'table_fromdb1"@sqlserver_prod '.

  Select * from 'dbo '. "table_fromdb1"@sqlserver_prod

  But how to (if possible) access from oracle

  sqlserver_db2.dbo.table_fromdb2

  without having to create a new sqlserver_db2_user referenced in a new dblink

  If oracle for oracle would be

  Select * from remote_oracle_schema.table@remote_oracle_db

  Hello

  You cannot select a table in a different SQL * database server from that to which the gateway instance connects.
  As stated in the documentation-

  Oracle® database gateway

  Installation and Configuration Guide

  11g Release 2 (11.2) for AIX 5 L Based Systems (64-bit), HP - UX

  Itanium, Solaris (SPARC 64-Bit), Linux x 86 operating system,

  and Linux x 86-64

  In the section.

  The example SQL Server multiple databases: Configuration of the modem router

  A separate instance of the gateway that is required for each SQL Server database. Each

  instance needs its own Gateway system ID (SID).

  ==========

  You will need to create a new instance of the gateway for the SQL * Server DB2 as well as a link separate db.

  Kind regards

  Mike

• A question on the impact of SQL * PLUS SERVEROUTPUT Optionconcernant v$ sql

  Hello everyone,
  

  SQL> SELECT * FROM v$version;
  
  BANNER
  ------------------------------------------------------------------------------
  Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
  PL/SQL Release 11.2.0.1.0 - Production
  CORE    11.2.0.1.0  Production
  TNS for Linux: Version 11.2.0.1.0 - Production
  NLSRTL Version 11.2.0.1.0 - Production
  
  SQL> 
  
  
  OS : Fedora Core 17 (X86_64) Kernel 3.6.6-1.fc17.x86_64

  I would like to ask a question about SQL * Plus SET SERVEROUTPUT option on / off and its impact on queries on views such as v$ sql and v$ session. This is the problem
  
  In fact I define three variables in SQL * Plus to store sidcolumns, serial # and prev_sql_id of session $ v in order to be used later, several times in various other queries, while I work always in the current session.
  
  So, here's how
  

  SET SERVEROUTPUT ON;  -- I often activate this option as the first line of almost all of my SQL-PL/SQL script files
  
  SET SQLBLANKLINES ON;
  
  VARIABLE mysid NUMBER
  VARIABLE myserial# NUMBER;
  VARIABLE saved_sql_id VARCHAR2(13);
  
  
  -- So first I store sid and serial# for the current session
  BEGIN
      SELECT sid, serial# INTO :mysid, :myserial#
      FROM v$session
      WHERE audsid = SYS_CONTEXT('UserEnv', 'SessionId');
  END;
  /
  
  
  PL/SQL procedure successfully completed.
  
  
  -- Just check to see the result
  SQL> SELECT :mysid, :myserial# FROM DUAL;
  
      :MYSID :MYSERIAL#
  ---------- ----------
         129   1067
  
  SQL> 

  Now let's say I want to run the following query as the last SQL statement is executed within my current session

  SELECT * FROM employees WHERE salary >= 2800 AND ROWNUM <= 10;

  According to the reference of database Oracle® 11 g Release 2 (11.2) description of session $ v
  
  http://docs.Oracle.com/CD/E11882_01/server.112/e25513/dynviews_3016.htm#REFRN30223]
  
  column prev_sql_id includes the sql_id of the last executed sql statement for the sid and serial data which, in the case of my example, it will be the above mentioned query SELECT on the employees table. So right after the SELECT statement on the employees table I have run the following

  BEGIN
      SELECT prev_sql_id INTO :saved_sql_id
      FROM v$session 
      WHERE sid = :mysid AND serial# = :myserial#;
  END;
  /
  
  PL/SQL procedure successfully completed.
  
  SQL> SELECT :saved_sql_id FROM DUAL;
  
  :SAVED_SQL_ID
  --------------------------------
  9babjv8yq8ru3
  
  SQL> 

  The value of sql_id, I'm supposed to find all the information on the sliders for my SELECT statement and also its value sql_text in v$ sql. Here is what I get when I query v$ sql on the stored sql_id

  SELECT child_number, sql_id, sql_text 
  FROM v$sql 
  WHERE sql_id = :saved_sql_id;
  
  
  CHILD_NUMBER   SQL_ID          SQL_TEXT
  ------------  --------------   -------------------------------
  0              9babjv8yq8ru3    BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES); END;

  So instead of

  SELECT * FROM employees WHERE salary >= 2800 AND ROWNUM <= 10;

  get the next value for the value of sql_text

  BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES);

  Which is of course not what I expected to find in v$ sql for the given sql_id.
  
  After a little googling, I found the next thread on OTN forum, where it was suggested (well, I think that may not be exactly the same problem) to disable SERVEROUTPUT.
  
  Problem with dbms_xplan.display_cursor
  
  It was exactly what I did

  SET SERVEROUTPUT OFF

  After that, I repeated the procedure as a whole and this time everything worked pretty much as expected. I checked SQL * more documentation for SERVEROUTPUT
  and also the page of v$ session, yet I don't find nothing indicating that SERVEROUTPUT should be operated off every time that views such as v$ sql, v $session
  are queired. I don't really understand the link in what concerns the impact that can have on the other or better say rather, why is there an impact
  
  Could someone kindly do a few details?
  
  
  Thanks in advance,
  
  Kind regards
  Dariyoosh

  >

  and also the page of v$ session, yet I don't find nothing indicating that SERVEROUTPUT should be operated off every time that views such as v$ sql, v $session
  are queired. I don't really understand the link in what concerns the impact that can have on the other or better say rather, why is there an impact

  Hi Dariyoosh,
  SET SERVEROUTPUT ON has the effect of dbms_output.get_lines running after each statement. Not only related to the system view.

  Below is what Tom Kyte is explained in this page:

  Now, sqlplus sees this feature and says "Hey, it wouldn't be nice for me to empty the buffer to the screen for the user? Thus, they added the command SQLPlus "set serveroutput we" which does two things

  (1) he tells SQLPLUS you would like run dbms_output.get_lines after each statement. You would like to make this network rounded up after each call. You want that this additional load will take place (think of a script of installation with hundreds / thousands of statements to run - maybe, just maybe you don't want this extra call after each call)

  (2) SQLPLUS automatically calls the API dbms_output "activate" to activate the buffering which is in the package.

  Kind regards.
  Al

• If / then the Concepts using SQL not PL/SQL - avoid ORA-00942

  Hello
  
  Im trying to write a monitor which works in all of 80 db (where there is only applicable 7 db)-I want it simply returns the null value or no line on the DB is not required on as it is integrated into a model
  
  A simplified version of the query "select col1, col2 from cat1.helptab.
  
  It's very good for all the DB who actually have cat1.helpteb in their breast, but for those who are not obviously ORA-00942: table or view does not exist is returned.
  
  I need to write a SQL statement that can move, * due to specific requirements, I can't use the PL/SQL for this *.
  
  Any ideas how I can construct the statement above return null or 'no reurned lines' if cat1.helptab does not exist in the comic book?... instead of return ORA-00942
  
  Any help would be appreciated

  What is the interms impact of objects are created in the DB? nothing?

  All operators/functions are generally available out of the box in a standard enterprise db installation.
  Your admin could gave a restricted access to (or uninstalled) dbms_xmlgen well - one thing I would check beforehand.

  How this same method would work for the selection of a column that does not exist?

  Almost the same:

  SQL> select extract (x.column_value, 'ROW/DEPTNO/text()').getnumberval () deptno,
         extract (x.column_value, 'ROW/DNAME/text()').getstringval () dname,
         extract (x.column_value, 'ROW/ALERT/text()').getstringval () alert
    from all_tables,
         table (
           xmlsequence (
             dbms_xmlgen.getxmltype ('select deptno, dname, ''WARNING'' alert from ' || owner || '.' || table_name || ' where deptno > 30').extract (
               'ROWSET/ROW'))) x
   where owner = 'MICHAEL'
     and table_name = 'DEPT'
  /
      DEPTNO DNAME                          ALERT
  ---------- ------------------------------ ------------------------------
          40 OPERATIONS                     WARNING
          50 SALES                          WARNING                       
  
  2 rows selected.
  

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