Constraint Unique NOT NULL in Data Modeling

Similar Questions

• SQL IN keyword does not not in the data model. ???

  I created a data model that extract codes window a table by using the IN keyword.
  
  < name of dataTemplate = "Enonce1" defaultPackage = "" than one dataSourceRef 'Flex' = > "
  Properties of <>
  < property name = "include_parameters" value = "true" / >
  < property name = "include_null_Element" value = "true" / >
  < property name = "include_rowsettag" value = "false" / >
  < property name = "scalable_mode" value = "off" / >
  < property name = "db_fetch_size" value = "300" / >
  < / properties >
  < Parameters >
  < name of the parameter = Valeurdefaut 'branchcode"="000"/ >
  < / Parameter >
  < lexicals / >
  < dataQuery >
  < name sqlStatement = than one dataSourceRef "Q2" = "" >
  <! [CDATA]
  SELECT branch_code from sttm_branch@dbuser1 where branch_code IN(:branchcode)
  []] >
  < / sqlStatement >
  < / dataQuery >
  < dataStructure >
  < name of the group = "G_BRANCHES" source = "Q2" groupFilter = "" >
  < element name = "BranchCode" value = "branch_code" / >
  < / Group >
  < / dataStructure >
  < / dataTemplate >
  
  I created a LOV named branches that hold the entire industry codes and have created a branchcode parameter and set its type from the menu and have assigned branches LOV. I've also selected the check box "Multiple Sélection" and "Can select all" for
  ' Can SΘlectionner everything ' I select 'pass all values '.
  
  Now I am faced with two questions.
  (1) when I select "All" from the LOV and try to view the report there is no counter code be passed as a parameter. When I select "All" in LOV the XML that is generated, that's how.
  
  <? XML version = "1.0" encoding = "UTF-8"? >
  < Enonce1 >
  < > 000 BRANCHCODE < / BRANCHCODE >
  < / STATEMENT1 >
  As you can see he is just passing the value defined as defaultValue in the data model.
  
  (2) when I select several entries of LOV they demonstrate them as parameter in XML, but no data is returned. Resulted in the XML is like that.
  <? XML version = "1.0" encoding = "UTF-8"? >
  < Enonce1 >
  < BRANCHCODE '000 ', '001','002 ' > < / BRANCHCODE > (these are the parameter values)
  < / STATEMENT1 >

  Hello

  you need a lexical parameter in your query:

  SELECT DEPTNO, DNAME, LOC FROM DEPT * & deptwhereclause *.

  This glossary can be defined in one before the report according to your setting of multiple selection

  If p_deptno is not null then
  deptwhereclause: = ' WHERE DEPTNO IN ('| p_deptno |') ' ;
  end if;

  This complete example is here: http://www.oracle.com/global/de/community/bip/tipps/dynamische_queries/index.html

  It's in German, but the screenshots and code may help anyway.

  Concerning
  Rainer

• How to name a NOT NULL Constraint

  Hi all
  
  is there a way to Data Modeler SQL Developer to name a NULL value constraint is NOT?
  For example, in the plain Oracle DDL I can:
  
  create table x)
  Number of y constraint x_y_nn not null
  );
  
  Thank you
  Michael

  Hi Michael,

  You can set constraint information not null in physical model - tab dedicated in the dialog column to the physical model.

  Philippe

• How can I Data Modeler does not generate constraints on NNC_ tables?

  Hi all

  Unfortunately I have not found the answer using Google ;-)

  When I generate my DDL scripts on my model on some tables Data Modeler (version 4.0.0) automatically generates constraints on the columns of the table "NNC_" for example:

  CREATE TABLE STG_DURCHGANGSKNOTEN

  (

  ID NUMBER CONSTRAINT NNC_STG_DURCHGANGSKNOTENv1_ID NOT NULL,

  Kilometrierung VARCHAR2 (20) CONSTRAINT NNC_STG_DURCHGANGSKNOTENv1_Kilometrierung NOT NULL,

  Letzte_Aenderung DATE CONSTRAINT NNC_STG_DURCHGANGSKNOTENv1_Letzte_Aenderung NOT NULL,

  Knotentyp VARCHAR2 (100) CONSTRAINT NNC_STG_DURCHGANGSKNOTENv1_Knotentyp NOT NULL,

  Name VARCHAR2 (100),

  BZ_Bezeichner VARCHAR2 (100),

  GUI_Bezeichner VARCHAR2 (100),

  Spurplanabschnitt_ID NUMBER NNC_STG_DURCHGANGSKNOTENv1_Spurplanabschnitt_ID CONSTRAINT NOT NULL,.

  XML_Document XMLTYPE

  );

  How can I avoid this? I like to just get something like this:

  CREATE TABLE STG_DURCHGANGSKNOTEN

  (

  IDENTIFICATION NUMBER NOT NULL,

  Kilometrierung VARCHAR2 (20) NOT NULL,

  Letzte_Aenderung DATE NOT NULL,

  Knotentyp VARCHAR2 (100) NOT NULL,

  Name VARCHAR2 (100),

  BZ_Bezeichner VARCHAR2 (100),

  GUI_Bezeichner VARCHAR2 (100),

  Spurplanabschnitt_ID NUMBER NOT NULL,

  XML_Document XMLTYPE

  );

  Thank you

  Matthias

  Hi Matthias,

  The NOT NULL Constraint clause appears likely because 'Not Null Constraint Name' property is set to the column.  (It is indicated on the Panel "forced by default and ' in the column properties dialog box.)

  To stop these products, you can go to the Data Modeler/DOF of the preferences page (on the Tools menu) and set the option 'generate short form of NO forced NULL.

  Note that there now is a forum specifically for the Data Modeler: SQL Developer Data Modeler

  David

• How to add constraints not null

  Data modeling Version 4.1.1.888 SQL

  How to add constraints not null in sql modeling data and rename the default constraint name that is getting generated when marking column as required.

  You can edit the template for the names of constraint not Null under properties-> setting->-> models naming standards. Change one marked 'not forced Null. Then, under preferences-> Data Modeler-> DDL, you must uncheck "generate short form constraint NOT NULL".

  

• Not Null on the column of a primary key constraint

  I came across a table defined in the same way to...
  
  create table t (t_id int constraint nn_t_id not null constraint pk_t primary, data key number);
  
  Of course, the primary key is the is not null, then is there a reason to add the redundant constraint not null?

  There are two parts to your question, I think:

  (1) why add a NOT NULL if a primary key is also reported.
  (2) why is null is NOT a name defined by the user (in this case nn_t_id).

  1 > I think you are right: there is no difference in behavior in the way that Oracle is going to reject the creation of NULL in this column (whether through the direct insert or update with a NULL value). I personally always declares the NOT NULL for columns, I know to never have null, regardless of whether the column is (member of) a PK.

  It's pretty funny, btw, the SQL standard as chosen able to be the NULL default value. I think that we all type much less, if the SQL standard chose NOT NULL default value. But that's another story.

  2 > I don't see given nullability defined by the user of the explicit names now and then, because of some "coding guideline' which dictates that constraint names must never be generated System. This guideline is often presented as a result of the exception handling of "client-side", where the constraint name is filtered SQLERRM and then more personalized to be displayed to the end user. However for NOT NULL constraint violations, I think (does not fully to check) that you are always thrown an ORA-01400 is an ORA-01407. Who nowadays both will tell you exactly (in SQLERRM) which column of this table is currently in violation of a NOT NULL constraint.

  Toon

• Distinguish NOT NULL constraints Check constraints

  Join user_constraints to user_cons_columns for constraint_type = 'C' indicates the Check constraints, and NOT NULL constraints, but also (because those are implemented as Check constraints).
  
  My question is how to filter constraints NOT NULL to let only the 'normal Check constraints '?
  
  I tried WHERE SUBSTR(search_condition,-12,12) & LT; & GT; 'IS NOT NULL '.
  but as search_condition is of type LONG, I can't use substring.
  
  Has anyone already found it? Thank you!!

  ByronBarton wrote:

  Has anyone already found it?

  Well, there is no easy way. Simple, if you always create named* validation constraints. If so, online NOT NULL constraint will get name generated and forced check no:

  SQL> create table test_tbl(
    2                        c1 number not null,
    3                        c2 number,
    4                        constraint test_tbl_chk1
    5                          check(
    6                                c2 is not null
    7                               )
    8                       )
    9  /
  
  Table created.
  
  SQL> select  constraint_name,
    2          generated
    3    from  user_constraints
    4    where table_name = 'TEST_TBL'
    5  /
  
  CONSTRAINT_NAME                GENERATED
  ------------------------------ --------------
  SYS_C008666                    GENERATED NAME
  TEST_TBL_CHK1                  USER NAME
  
  SQL> 
  

  However, if the check constraint is not named we:

  SQL> create table test_tbl(
    2                        c1 number not null,
    3                        c2 number,
    4                        check(
    5                              c2 is not null
    6                             )
    7                       )
    8  /
  
  Table created.
  
  SQL> select  constraint_name,
    2          generated
    3    from  user_constraints
    4    where table_name = 'TEST_TBL'
    5  /
  
  CONSTRAINT_NAME                GENERATED
  ------------------------------ --------------
  SYS_C008668                    GENERATED NAME
  SYS_C008669                    GENERATED NAME
  
  SQL> 
  

  Then, the only way I know is:

  SQL> column owner format a10
  SQL> column table_name format a10
  SQL> column column_name format a10
  SQL> select  u.name owner,
    2          t.name table_name,
    3          a.name column_name,
    4          c.name constraint_name,
    5          decode(k.type#,7,'NOT NULL',1,'CHECK CONSTRAINT','UNKNOWN') type
    6    from  sys.USER$ u,
    7          sys.CON$  c,
    8          sys.CDEF$ k,
    9          sys.OBJ$ t,
   10          sys.COL$ a,
   11          sys.CCOL$ r
   12    where u.name   = user
   13      and c.owner# = u.user#
   14      and k.con#   = c.con#
   15      and t.obj#   = k.obj#
   16      and t.name   = 'TEST_TBL'
   17      and a.obj#   = t.obj#
   18      and r.col#   = a.col#
   19      and r.con#   = k.con#
   20      and r.obj# = k.obj#
   21  /
  
  OWNER      TABLE_NAME COLUMN_NAM CONSTRAINT_NAME                TYPE
  ---------- ---------- ---------- ------------------------------ ----------------
  SCOTT      TEST_TBL   C1         SYS_C008668                    NOT NULL
  SCOTT      TEST_TBL   C2         SYS_C008669                    CHECK CONSTRAINT
  
  SQL> 
  

  SY.

• Please let me know how I can add a new column with a constraint not null, table already has data, without falling off the table... Please help me on this issue...

  Hello

  I have an emp_job_det with a, b, c columns table. Note that this TABLE ALREADY has DATA OF THESE COLUMNS

  IAM now add a new column "D" with forced not null

  Fistly I alter the table by adding the single column "D", if I do, the entire column would be created with alll of nulls for the column DEFAULT D

  ALTER table emp_job_det Add number D; -do note not null CONSTRAINT is not added

  Second... If I try to add the constraint not null, get an eoor as already conatained null values...

  (GOLD)

  In other words, if I put the query

  ALTER table emp_job_det Add number D NOT NULL; -THROWS ERROR AS TABLE ALREADY CONTAINS DATA

  So my question is how how can I add a new column with a constraint not null, table already has the data, without falling off the table

  Please help me on this issue...

  Add the column without constraint, then fill the column. Once all the rows in the table are given in the new column, and then add the constraint not null.

• The names of generated by the system, not null constraints are not entered

  Hello:
  
  After the test, I found that the names of system generated (SYS_C #, etc.) for constraints not null are not captured and placed in the not Null Constraint field 'Name' of DM during the import of the data dictionary.
  
  In my view, that it is a bug. I'm doing something wrong?
  
  Doc

  Hi Doc,

  We do not import the names of system generated and shaped (SYS_C # are not included in the generated DDL.) Model point of view, they are forced null nut without a name.

  Philippe

• SDDM EA1 named not null constraint

  When I try to use named constraints not null in 3.1 EA1, they are not generated in the DDL export.
  They are appointed in the physical model column properties dialog box, but they are not included in the generated DDL. Instead of the name, a line break seems to be generated.
  
  When I try this in 3.0 named constraints are correctly generated in the DDL.
  
  Is this a bug or something has changed between versions?

  Hello

  I suspect that the option 'generate short form of NOT NULL' is defined constraints (on the Data Modeler/DDL tools/preferences page) in your EA1 3.1 installation?

  This option is selected, the name of the constraint to be omitted from the DDL.

  David

• 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

• Is it possible to remove the NOT NULL to a non-key column constraint?

  Oracle version: Enterprise Edition 11g - 11.2.0.1.0
  OS: Redhat Linux Enterprise Edition 5.0
  
  
  
  Hi all
  
  
  I have a question on the NON NULL columns in oracle tables and I would be grateful if you could kindly help me with this problem well.
  
  I have the following table

  CREATE TABLE ARTICLES
  (
      artid                VARCHAR2(20),
      lbl                  VARCHAR2(100)        NOT NULL,
      cmporder             VARCHAR2(30)         NOT NULL      
  )
  
  ALTER TABLE ARTICLES ADD CONSTRAINT PK_ARTICLES PRIMARY KEY(artid);

  It's about a year that I have this table but recently the data model has changed and the third column of the table is that is mandatory, so NULL values for column 3 cmporder are allowed. I want to know is if it is possible to change the definition of the table (for example using an ALTER statement) in order to remove the "NOT NULL" in the third column constraint? This way I can keep the 2 million lines that are already in the table and avoid making a bakup before the deletion and re-creation of the table.
  
  
  Thanks in advance,
  
  Kind regards
  Dariyoosh

  Yes its possible...

  ALTER TABLE ITEMS CHANGE cmporder NULL;

  It will do for you

• Column mandatory (NOT NULL) constraint

  Need not pre-existing NOT NULL constraint column label presented next to the default column, column name and data type, when you display a data model to engineering reverse for end users to review the provisions of tables. How and NOT on label NULL is generated for display of reverse engineering constraints?

  I'm not sure to understand what you want - have marked the columns not null (required) on diagram (they are marked with ' *' character before the name of column) or not null constraint name printed on the diagram. I first thought that it is generation of DDL.

  Philippe

• Data Modeler - deferred constraints

  I missed again an option or it is not possible to assign a constraint can be deferred?

  These settings are in physical model - Watch column, UK, PK, FK and table check constraint there:
  CREATE THE TABLE HR. EMPLOYEES
  (
  EMPLOYEE_ID NUMBER (6)
  NOT NULL CAN BE POSTPONED TO THE DELAYED START.
  ....
  )
  ...
  ALTER TABLE HR. EMPLOYEES
  ADD CONSTRAINT TCC4
  CHECK (salary > 0)
  MAY BE DEFERRED
  FIRST DEFERRED
  ENABLE
  VALIDATE
  ;

  ALTER TABLE HR. EMPLOYEES
  ADD CONSTRAINT EMP_EMP_ID_PK PRIMARY KEY (EMPLOYE_ID) CAN BE DELAYED DELAY;

  ALTER TABLE HR. EMPLOYEES
  ADD CONSTRAINT EMP_EMAIL_UK UNIQUE (E-MAIL) CAN BE DELAYED DELAY
  ;

  Philippe

• What is the difference between primary key and unique indexes with forced not null?

  Primary key is = unique index + not null?

  The short answer is Yes.

  However, even if the primary key, applying both uniquness and not null, there is a notion of "special".

  You can only have one primary key in tables, but you can have multiple unique indexes and constraints not null.

  See: https://asktom.oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:8743855576462