Sense of a "CONSTRAINT".

Similar Questions

• CONSTRAINT to CHANGE DISABLE VALIDATE pk

  Sorry for the questions.

  However, I'm on my way to the OCP and face many new aspects.

  If I have pk CONSTRAINT to EDIT, DISABLE VALIDATE no LMD is possible I read into Oracle concepts.

  It makes sense, because the data in the table are validated and no insert with unchecked data should happen.

  However, sql loader runs that I discovered. How does this work?

  Loader "inserts" the data in the table? And can sql loader put (non-unique) "invalid" data in the table?

  Concerning

  Christian

  SQL Loader also supports Direct path loading that is different from the classic SQL INSERT statement

  Officers Direct and conventional

• unique or constraint validation?

  I'm not a pl/sql programmer, can often sort code to make sense and have written simple stuff, so...
  
  I need to put in place a constraint on a field in a 'form with report.' Catalogs the user documents and there are number of iterations of the document numbers (ISO_NUMBER) according to the type (political, checklist, procedure: POL-xxxx, VS-xxxx, PRO - xx *. * xxxx, etc..) Each document has revisions, of which some are incremented by a certain number and others by letter POL - xx.xxxx Rev A, Rev B or VS-xxxx Rev 1, Rev 2, etc.). For these fields of revision, which are a separate area that the ISO_NUMBER and other unrelated areas who have no points, hyphens, or alphanumeric combination and need to auto-increment when a new form is sent, I set up calculations and processes to treat this increment automatically on submit (thanks to one of you guys several months ago!).
  
  How can I configure an error handler or constraint so that when it sends a new form but has duplicated the ISO_NUMBER, an alert will appear? If she creates a new revision, the ISO_NUMBER and the title of the document (DOC_TITLE) will not change. If she has reproduced the ISO_NUMBER inadvertently, the DOC_TITLE will be different.
  
  I have him asked to simply sort the report (and showed her how to save a report sort of that way) to display the most recent number created so she can simply enter the next, but... .well you know this story. So, if that's too much, and that I should put my foot down, tell me.
  
  Also, I can not change the numbering conventions - I addressed this issue several times I get the "this is the legacy." Well, "LEGACY" has been plagued with inconsistencies as you can imagine, more than six years I was employed here, so I will try to prevent the user as much as possible. I had the chance to separate the rev of the chain of document number, and then I cleaned up thousands of names of document files! :-)
  
  Request Express 4.0.0.00.46
  
  TIA,
  Alexandra

  Based on your pseudocode, a validation of type function returns BOOLEAN would be something like the following. Mind you I don't really understand why the document title and ISO number must match so that he can generate a warning, but not my concern...

  P # bind variable must obviously be replaced with the names of items in real pages.

  DECLARE
    v_count    NUMBER;
  BEGIN
    -- Only check ISO when not a revision
    IF NVL(:P#_REVNUMBER, 'IR') = 'IR' THEN
      -- See if any documents match this ISO # and doc title
      SELECT COUNT(*)
      INTO   v_count
      FROM   doc_info
      WHERE  doc_title  = :P#_DOC_TITLE
      AND    iso_number = :P#_ISO_NUMBER;
  
      IF v_count > 0 THEN
        RETURN TRUE;
      END IF;
    END IF;
    RETURN FALSE;
  END;
  

• foreign key constraint

  I am trying to create a relationship between the student and address table so that impossible to insert a record into the table of addresses with a table of student entry.
  
  create table students
  (
  student_id number (5),
  first name varchar (10),
  varchar (15) last_name,.
  number (3) of the age.
  Address varchar (15).
  occupation varchar (25), primary key (student_id, age)
  );
  ---------------------------------
  create the address table
  (
  student_id number (5) primary key,.
  Street varchar2 (30),
  City varchar2 (10),
  Code postal number (5)
  Student (student_id) REFERENCES
  );
  
  Its gives me error
  ORA-02270: no unique or primary key corresponding to this column list
  
  But if I take the age in the primary key column in the student table, it works. But I want the student table to have a primary key on student_id and age.
  
  Thank you
  Sharath

  For what reason you ever a primary key on student_id and age (no sense for me).
  You can calm down the primary key for the love that never gave you this requirement, create a unique constraint not null on student_id.

  See,

  SQL> CREATE TABLE student
    2  (
    3     student_id     NUMBER (5) UNIQUE NOT NULL   -- Note this.
    4    ,first_name     VARCHAR (10)
    5    ,last_name      VARCHAR (15)
    6    ,age            NUMBER (3)
    7    ,address        VARCHAR (15)
    8    ,occupation     VARCHAR (25)
    9    ,PRIMARY KEY (student_id, age)
   10  );
  
  Table created.
  
  SQL>
  SQL> CREATE TABLE address
    2  (
    3     student_id     NUMBER (5) PRIMARY KEY
    4    ,street         VARCHAR2 (30)
    5    ,city           VARCHAR2 (10)
    6    ,zipcode        NUMBER (5)    REFERENCES student (student_id)
    7  );
  
  Table created.
  
  SQL> 
  
  Now your primary key is there(because you insisted), But will not have any effect.
  

  G.

• The doc is correct on the constraint not null and scan limited index full?

  Gave birth to the large [url http://forums.oracle.com/forums/thread.jspa?messageID=9313643] another thread:
  

  Jonathan Lewis wrote:
  >
  

  I wasn't expecting to see because the doc said about scan limited index full "...". and at least one column in the index key has the NOT NULL constraint,"which would be foolish to say if the rowid was what filled that. There are currently only 2 factory codes and code 1 company (not nulls - Oracle does know that?), so I was kind of expected Oracle to reorder the predicates with an index skip scan. Take a fresh look on the doc, I wonder if I should not specify the company code in the query and maybe spend employee and job_number in the index. I hope it's obvious that this index has been added for other queries. This request could be taken out a change in the requirements of anyway, but I don't know when.

  If you wear it as a separate thread, I'll take a look.
  Can you give a reference to the manual - the comment you quoted may not be correct.

  Just below where Hemant pointed to in the other thread, http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/indexiot.htm#sthref314
  
  (Somehow I have the feeling that we had this conversation before, perhaps in a forum that no longer exists. "(Or was it all just a dream)."
  
  Edit: Also seen in
  http://download.Oracle.com/docs/CD/B28359_01/server.111/b28274/optimops.htm#i52044
  http://download.Oracle.com/docs/CD/B14117_01/server.101/b10752/optimops.htm#51111
  http://download.Oracle.com/docs/CD/F49540_01/doc/server.815/a67781/c20b_ops.htm#11004
  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14211/optimops.htm#i52044
  
  and everything on the net.
  
  Edited by: jgarry 26 January 2011 17:41
  2nd edition: link fix that edit may 1 have ransacked.
  
  Edited by: jgarry January 27, 2011 10:40

  Joel,

  I just had this 'already seen' (new) sense to speak of it.

  Mentioning the reference 11.1 gave you:
  

  
  + "Index full scans are an alternative to a full table scan when the index contains all the columns needed for the query, and at least in the index key column has the constraint NOT NULL. A full scan can access the data of the index itself, without access to the table ' + '.
  

  This so obviously must be bad that I couldn't decide if I was proven wrong or was amazed to find that I couldn't he show the falsity. (Just because something is obvious, it does not mean it is true – Terry Pratchett.)

  However, here is the obvious counter-example - that I came across 8.1.7.4 because it's the oldest version of Oracle that I have now:

  create table t1
  as
  select
       rownum               id1,
       rownum               id2,
       rownum               id3,
       lpad(rownum,10,'0')     small_vc,
       rpad('x',100)          padding
  from
       all_objects
  where
       rownum <= 10000
  ;
  
  create index t1_i1 on t1(id1, id2, id3);
  
  begin
       dbms_stats.gather_table_stats(
            ownname           => user,
            tabname           =>'T1',
            cascade           => true
  
       );
  end;
  /
  
  set autotrace traceonly explain
  
  select
       /*+ index_ffs(t1) */
       id1, id3
  from
       t1
  where
       id2 = 99
  ;
  

  No 'NOT NULL columns". But any line I will have a (non-null) value for id2, then it should be in the index - then Oracle should be able to do a full scan and get the right answer. Here is the map (I have no need of Council - but your configuration may be different):

  Execution Plan
  ----------------------------------------------------------
     0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=4 Card=1 Bytes=12)
     1    0   INDEX (FAST FULL SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=4 Card=1 Bytes=12)
  

  If you change the predicate to: "id2 is zero", then the only legal path is an analysis.

  Concerning
  Jonathan Lewis
  http://jonathanlewis.WordPress.com
  http://www.jlcomp.demon.co.UK

  + "I believe in the evidence. I believe in observation, measurement and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wildest and most ridiculous something is, however, the firmer and more solid, the evidence should be. » +
  Isaac Asimov

• How to cancel the last update, it works better and makes more sense!

  before I upgraded to the nxt version, everything was more easy to use and MAKES MORE SENSE

  • Click Start
  • Click on Control Panel
  • Click on uninstall a program
  • Click Mozilla Firefox in the list
  • Click on the button uninstall
  • Make sure that you do not remove personal settings etc.
  • Install version 28.

  That's how I did it.

  HTH
  Jottum

• I started to have some pop-under ads every time I run Firefox and uninstall instructions don't make sense, how can I stop these?

  In the last two weeks, whenever I run Firefox, a grandeur nature pop-under ad is also launched, regardless of which site I am browsing.

  The original ad was for a survey on You Tube and contains a link to coupondropdown.com, where there is a menu option for uninstalling. The uninstall instructions don't make sense, they do not mention what ad - control ads, and I can't work out what is responsible for the ads of my very basic range of ad - ons.

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  Sometimes a problem with Firefox can be a result of malware installed on your computer, you may not be aware of.

  You can try these free programs to search for malicious software that work with your existing anti-virus software:

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  More information can be found in the article troubleshooting Firefox problems caused by malware .

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  Its OK if the IMEI of the phone and the case matches together!

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  Hello:

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