How to create an entity with more than one primary key.

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• Why we cannot create more than one primary key on a table. Why we create several unique key on a table. Please explain if anyone have details of this.

  Why we cannot create more than one primary key on a table. Why we create several unique key on a table. Please explain if anyone have details of this.

  «a primary key has semantic meaning, it is to be immutable (never change of value), unique and not null.»

  a unique constraint is simply "at any time, these values are unique - they can change and they can be null.

  You use a unique when constraint

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  (b) you allow NULL values in attributes
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  https://asktom.Oracle.com/pls/Apex/f?p=100:11:0:P11_QUESTION_ID:5541352100346689891

• Create interactive files with more than one URL

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• Tabular report with more than one line by line

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  I designed a sort of Gallery page, a tabular report with only two small columns per line: a thumbnail from a BLOB column and link textual branching to a page showing the full size image with a bunch of textual information on this subject.
  
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• Select Date Max with more than one result

  Hello;
  
  I need to write a query that returns the maximum date for a specific transaction that is not a problem, but my problem occurs when I have several transactions with the same date max trans.
  
  
  Can someone help me write something which will return only one record from a result set that has more than one record
  
  Example:
  
  TRAN_ID - LAW #-TRANS_DATE
  -272-1111111-29/10/1999 00:00:00
  -273-1111111-29/10/1999 00:00:00
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    from account_transaction atr
   where max_days_in_arrears > 90
     and account_number in (100026, 121189, 100223)
     and trans_date = (select distinct max(trans_date)
                         from account_transaction
                        where account_number = atr.account_number
                          and max_days_in_arrears > 90)
   order by account_number, trans_date
  )
  where rn = 1;
  

  and use code tags please, so that your queries can still be read easily and quickly for us to understand.

  Published by: hoek on March 23, 2009 15:48

• How can I do data with more than 72 dpi in loose 8?

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  You must resample the image by Image > resize > image size.

  Please look at this from the help file:

  http://help.Adobe.com/en_US/PhotoshopElements/8.0/win/using/WSae2ea3b149d0c3591ae939f10386 0b3d59 - 7ee0_WIN.html

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• Create name synonymous with more than 30 characters.

  I created a synonym for a table which is over 30 characters long.
  After you have created the synonym with create synonym... created synonym message shows.
  but when I check in view object that syninym is not available, and
  Select * from < synonym_name > returtning nor the ranks.
  
  What is the reason for this? If oracle poster created as Syninym message then where his stored?
  
  Thanks in advance...

  To demonstrate the above...

  SQL> select * from user_synonyms;
  
  no rows selected
  
  SQL> create synonym MY_EMPLOYEE_RECORDS_VERY_LONG_NAME for EMP;
  
  Synonym created.
  
  SQL> select * from user_synonyms;
  
  SYNONYM_NAME                   TABLE_OWNER                    TABLE_NAME                     DB_LINK
  ------------------------------ ------------------------------ ------------------------------ ---------
  /9c4d39ff_MY_EMPLOYEE_RECORDS_ SCOTT                          EMP
  
  SQL> select * from MY_EMPLOYEE_RECORDS_VERY_LONG_NAME;
  select * from MY_EMPLOYEE_RECORDS_VERY_LONG_NAME
                *
  ERROR at line 1:
  ORA-00972: identifier is too long
  
  SQL> select * from "/9c4d39ff_MY_EMPLOYEE_RECORDS_"
    2  ;
  
       EMPNO ENAME      JOB              MGR HIREDATE                   SAL       COMM     DEPTNO
  ---------- ---------- --------- ---------- ------------------- ---------- ---------- ----------
        7369 SMITH      CLERK           7902 17/12/1980 00:00:00        800                    20
        7499 ALLEN      SALESMAN        7698 20/02/1981 00:00:00       1600        300         30
        7521 WARD       SALESMAN        7698 22/02/1981 00:00:00       1250        500         30
        7566 JONES      MANAGER         7839 02/04/1981 00:00:00       2975                    20
        7654 MARTIN     SALESMAN        7698 28/09/1981 00:00:00       1250       1400         30
        7698 BLAKE      MANAGER         7839 01/05/1981 00:00:00       2850                    30
        7782 CLARK      MANAGER         7839 09/06/1981 00:00:00       2450                    10
        7788 SCOTT      ANALYST         7566 19/04/1987 00:00:00       3000                    20
        7839 KING       PRESIDENT            17/11/1981 00:00:00       5000                    10
        7844 TURNER     SALESMAN        7698 08/09/1981 00:00:00       1500          0         30
        7876 ADAMS      CLERK           7788 23/05/1987 00:00:00       1100                    20
        7900 JAMES      CLERK           7698 03/12/1981 00:00:00        950                    30
        7902 FORD       ANALYST         7566 03/12/1981 00:00:00       3000                    20
        7934 MILLER     CLERK           7782 23/01/1982 00:00:00       1300                    10
  
  14 rows selected.
  
  SQL>