Functions in the inner query

Hello!
I challenged the following problem. Here's the simple query:

SELECT id, id, id from
(select 1, sys_guid () as double id)

as you can see there is a sys_guid() function in the inner query. So, why do we use these
constructions? Right - to calculate the value of a function once and use it again so much
time, that we need. So I guess to get three identical fields. But, as it turns out, it is not
always too! I mean, on one version of Oracle database this query return the same three
fields, but on another - three different! Based on what the sys_guid() function is a kind of
random function, I can assume that the function is run three times in the second case
instead of one (as it should)! So why is it? Is - this bug from version, or an option in
control file that influence the optimizer?

PS: I found a workaround on this basis, where this query produces abnormal results, we can use
Internal ORDER BY clause in the query:

SELECT id, id, id from
(select 1, sys_guid () as command id double by 1)

The oracle optimizer is the fusion view inline with the outer select block. He replaced effectively by:

select sys_guid(), sys_guid(), sys_guid()
from dual

You can avoid this as follows:

select /*+ no_merge(x) */
         id,id,id from
(select 1,sys_guid() as id from dual) x

Published by: Toon Koppelaars on July 9, 2009 09:22

Tags: Database

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       '       
Fetch First Row only ;        
EXCEPTION                                   
WHEN OTHERS THEN                                          
:2 := SQLERRM;
end;'
       ;
       dbms_output.put_line (stmt) ;
       EXECUTE IMMEDIATE stmt USING OUT ReturnValue, OUT DefaultValue;
       --select Valueinto into Returnvalue from dual;
       RETURN ReturnValue;
END;

    Now, I created a folder in the Package

    create or replace PACKAGE Collection_PKG
is
type Bank_rec is RECORD
(
SNO           NUMBER(10),    
BANKID        NUMBER(5),    
BANKNAME       VARCHAR2(50),    
BANKSC         VARCHAR2(50),    
ADDEDIT       varchar2(1),    
COMPID        number(5),    
ISBULK        number(1),    
ROWNO         number(10),    
ERROR         VARCHAR2(500)  
);


TYPE Bank_tbl IS TABLE OF Bank_rec;
--type Bank_cur is ref cursor return Bank_rec;


end Collection_PKG;

end Collection_PKG;
end Collec
tion_PKG;

    Now, when I'm Trying the code below

    DECLARE
  V_EXECQUERYPARAM XMLTYPE:= XMLTYPE('<QueryParam>
  <BankXML>
    <Bank>
      <BankID>0</BankID>
      <BankSC><![CDATA[RCB]]></BankSC>
      <BankName><![CDATA[Royal challenger Bank]]></BankName>
      <IsBulk>0</IsBulk>
      <AddEdit>A</AddEdit>
    </Bank>
  </BankXML>
</QueryParam>');
BEGIN
 Rspbanksave(
    v_SPParamList => V_EXECQUERYPARAM  );


END; 


    create or replace PROCEDURE rspBankSave (
              v_SPParamList XMLTYPE DEFAULT NULL)
IS
       V_Addedit VARCHAR2 (1 CHAR) ;
       Bank_tbl Collection_PKG.BANK_TBL := Collection_PKG.BANK_TBL () ;
BEGIN
       
       SELECT Row_number () OVER (ORDER BY 1),
              XT.BankID,
              XT.BankName,
              XT.BankSC,
              XT.AddEdit,
              v_CompID,
              XT.IsBulk,
              CAST (0 AS NUMBER (5)),
              CASE
                     WHEN MBank.BankID IS NOT NULL
                     THEN
                            CASE
                                   WHEN XT.BankSC     = MBank.BankSC
                                      AND XT.BankName = MBank.BankName
                                   THEN 'R104|Entry Already Exist,R114|Short Code Already Exist'
                                   WHEN XT.BankSC = MBank.BankSC
                                   THEN 'R114|Short Code Already Exist'
                                   WHEN XT.BankName = MBank.BankName
                                   THEN 'R104|Entry Already Exist'
                            END
                     ELSE NULL
              END Bulk collect
       INTO   Bank_tbl
       FROM   XMLTABLE ('//QueryParam/BankXML/Bank' PASSING v_SPParamList COLUMNS BankID NUMBER (5)
              PATH 'BankID', BankName                                                    VARCHAR2 (
              50) PATH 'BankName', BankSC                                                VARCHAR2 (
              50) PATH 'BankSC', AddEdit                                                 VARCHAR2 (
              1) PATH 'AddEdit', IsBulk                                                  NUMBER (1)
              PATH 'IsBulk') XT
       LEFT JOIN MBank
       ON     XT.BankID   != MBank.BankID
          AND v_CompID     = MBank.CompID
          AND (XT.BankSC   = MBank.BankSC
           OR XT.BankName  = MBank.BankName) ;
       v_TotalRowCount    := SQL%ROWCOUNT;






       IF (v_TotalRowCount > 0) THEN
              
                     BEGIN
                           V_Addedit:=rfunGetColumnValue (ColumnName=> 'Upper(AddEdit)',TableName=>'table(Bank_tbl)',DefaultValue=>'',Criteria =>'');
                     END;
                     --SQL Code here
              
       END IF;
       
END rspBankSave;

    As I've suggested before:

    To get the name of the table the column

    and as others have:

    Type global temporary Tables vs. table

    If you give more context, more information about the bigger picture, more information about what you're trying to do and why you're going down the road you go down, you can return more useful information. But you seem reluctant to do.

    For the moment, your recent posts seem to just raise the same type of question - why are you doing this?

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    It is the most effective way.

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