many-to-many relationship, recording is not linktable

Similar Questions

• Repository many-to-many relationship, a side not updated.

  Hello.

  We have a point called creditCardInstallments descriptor and in a list of products.

  < table name = "lc_install_products" type = "multi" id-column-names = "install_id" >

  < property name = data type "productList" = "dΘfinir" column-name = 'product_id' component-type of element 'product' = repository = "/ atg/commerce/catalog/ProductCatalog '>

  < attribute name = "References" value = "true" / >

  < / property >

  < /table >

  And in the point-product descriptor, we are referencing the payments, only for display.

  < table name = "lc_install_products" type = "multi" id-column-names 'product_id' = >

  < property name = "installmentList" = "dΘfinir" column-name = "install_id" component-type of item = "creditCardInstallment" repository = data type ' / yyy/repository/zzzRepository " write = 'false' readable ="true">

  < attribute name = "References" value = "true" / >

  < / property >

  < /table >

  But when you add a product in a creditCardInstallment, is not updated the list of range in the product. Missing something?

  You must have your definition below to make it work, the only side reading would be fixed, and the accessible side in writing would be list.

  For creditCardInstallments point-descriptor having ownership of products available in writing

  And in the point-product descriptor, we are referencing the payments, only for display.

  Table constraints should be as below.

  KEY(install_id,SEQUENCE_NUM) primary SCHOOL;

  KEY (product_ID) FOREIGN REFERENCES CATA. DCS_product (product_ID);

  This should refer to the id column from the primary table where the installation item is registered

  KEY (install_id) FOREIGN REFERENCES CATA. INSTALLATIONs_TABLE (install_id);

• How to implement many of many relationships?

  I've been google searching for articles on the implementation of many-to-many relationships and find as many hits I'm swamped.
  Someone at - he preferred an article on this topic?
  
  In my example, I have a number to-many between the table 'user' and 'project' of the table.
  Why do some articles indicate that the primary key of the table of links 'UserProject' contains two foreign keys for 'user' and 'project '? If we want to find all projects for a given "user.id", we not specifying the "project.id". It will not be reduced in a linear search then?
  
  I thought we should receive the 'fk_user' foreign key as the primary key and create an index of the "fk_project" (or vice versa). So if we specify the "user.id" we can quickly find all the corresponding values of 'project.id '.
  
  There are oracle-specific issues I should know about?
  
  Thank you
  Siegfried

  As you guessed, a primary key is intended to preserve the unique character.
  If you have a composite primary key, so if you provide columns in the predicate (where clause) that are the primary key columns, then they can help you with an effective search.

  If you have a requirement that you have aquery that always uses the 2nd and 3rd in the columns of the primary key, but never the first column, then you might want to add a composite index on these two columns.

  Remove the referential integrity of a production database is pretty much one of the worst things you can do.
  Think about the consequences: you'll have records of children who do not have a parent record or worse have the incorrect parent record. It is best to not leave a record get in the database to allow incorrect data.

  Incorrect data are a nightmare to fix, as its very difficult to find the source, and worse still, it can remain unnoticed for years.

  Your mantra should be to avoid bad data in the database. This by applying constraints at the level of the database.
  This means that all data entered with conform to these rules.

• Cascading list of values with a many-to-many relationship

  Hi all

  I have three paintings; semester, subject and half of subject. Each semester has a lot of topics and a subject can be taught in several semesters.

  create table semester(
       id number not null,
       name varchar2(50) not null,
       primary key(id)
  );
  create table subject(
       id number not null,
       name varchar2(50) not not null,
       primary key(id)
  );
  create table semester_subject(
       id number not null,
       semester_id number not null,
       subject_id number not null,
       primary key(id),
       foreign key(semester_id) references semester(id),
       foreign key(subject_id) references subject(id),
       constraint semester_subject_uq unique(semester_id, subject_id)
  );
  
  

  EDIT: I have a page with a report that shows all students who are currently enrolled in the selected for the selected session object.

  There are two selection lists at the top of the report, one for the half and the other for the subject.

  What I try to do is when you select a semester in the half selection list, the topic selection list should contain only the subjects for the half of some (not all) in the subject of the painting.

  h

  If the relationship was of 1 to many that I could write to see half of value

  select name, id
  from semester
  order by 1
  
  

  and for the purpose of value list

  select name, id
  from subject
  where semester_id = :PX_SEMESTER
  
  

  But now that the relationship depends on the table of semester_subject, I can't find a way to achieve this and Googling has not helped.

  Thanks in advance for any help.

  I believe that this issue has also been implemented on stack overflow plsql - list of values cascading with many-to-many relationship - stack overflow and received a very wide response. If the OP has not yet verified, he may want to.

  (FYI: I'm not the person who answered there.)

• How to create the Group of cache for many to many relationship tables?

  Hi, Chris,.
  Page 4-4 < < the user manual of the Oracle Database Cache in memory > > there is a saying,
  A child table cannot reference multiple parent tables.
  If there is a many-to-many relationship table in Oracle and I want to cache in TT, there is not a la carte approach that?
  Or I have to logically break his references to the two tables in one of them?
  I forgot to mention that I have a root table and one of its child tables is a many-to-many relationship table.

  Yes, that's correct. You can not exactly this model in TimesTen. You to omit some of the relationships so that things are defined in TimesTen as a pure parent/child relationship. You can also consider putting the tables into groups separate cache. Of course, there are consequences to this:

  1. the 'missing' relationship cannot be run by TimesTen. The application must respect/run it. If this is not some updates may not to be propagated to Oracle if they violate the relationship in Oracle.

  2 If the parallel AWT is configured (to improve the performance of spread) it will not be used for all tables where they lack of relationships. All updates to the tables in the order will apply.

  Chris

• How to handle many-to-many relationship

  Hello friends,
  I'm confused, how do many many relationships in my application:
  
  I have agents and projects of two tables.
  Each agent can manage several projects.
  Each project can be handled by several agents.
  
  Example of table INIT_PROJECT:

  ID , PROJECT
  1  , X Tower
  2  , Y Tower
  3  , Z Tower

  Example of table INIT_AGEN:

  ID , Agent
  1  , A
  2  , B
  3  , C

  What is the correct way to join or to represent the relationship between the two tables to get a table that servers as a lookup table also:
  
  is - it to be like this:
  
  Example 1 in new_table
  

  Project_ID , Project_name, handled_by1, handled_by2, handled_by3, handled_by4
  1             , X tower        ,  A              , B

  or is it:

  ID            , Project_name, handled_by
  1             , X tower        ,  A            
  2             , X tower        ,  B              
  3             , X tower        ,  C   
  4             , Y tower        ,  A              
  5             , Y tower        ,  B              
  ........
  .....             
             
    

  Then, on a FORM I have lists of values.
  Projects and Agents.
  When the user selects a project, he or she can only see the agents engaged in this project in the list of Agents of values.
  I use a shuttle box for inserting the values "managed by".
  
  Or do like this:
  Example 2 of new_table

  ID , PROJECT,...,HANDLED_BY
  1  , X Tower,... ,A:B:C:D
  2  , Y Tower,... ,A:F:G:I
  3  , Z Tower,... ,F:A:I:W

  I have two lists of values:
  'Project name' and 'Agent '.
  When the user selects a project, then he must see only the values of the handled_by that are associated with this project only.
  
  I used this query to prepare the values in the list of officers of the value
  

  SELECT  
    distinct REGEXP_SUBSTR(handled_by, '[^:]+', 1, LEVEL)  d , REGEXP_SUBSTR(handled_by, '[^:]+', 1, LEVEL) r
     
    FROM  (
           SELECT   project, ROWNUM AS id
           ,      handled_by
           FROM   projects 
          ) where project = :P8_project
    CONNECT BY INSTR(handled_by, ':', 1, LEVEL-1) > 0
           AND id = PRIOR id
           AND PRIOR DBMS_RANDOM.VALUE IS NOT NULL; 

  Can you please advice what is the right way?
  
  Best regards
  Fateh

  Somone was asked once to use the relation tables in that many many cases and I used it since with no problems until now.

  To apply in your case, I therefore project table, agent and a relationship table call PROJECT_AGENT_R which has

  (1) project
  (2) Agent_ID

  The primary key for each table as a foreign key.

  You can update the relationship via process page in your table when after you have created a project for an agent.

  Do not use string concatenated as your code above as it can be annoying and not really a good practice.

• one-to-many relationship

  Read the article here...
  
  http://www.databaseprimer.com/relationship_1tox.html
  
  To illustrate the one-to-many relationship consider the table of sampling plan and data below:
  authors table
  ============
  author_id (primary key)
  LastName
  FirstName
  book_id (foreign key - link to table books book_id)
  
  
  table Books
  ===========
  book_id (primary key)
  title
  

  author_id  lastname  firstname   ->     book_id  title
  ---------  --------  ---------   ->     -------  ------
  0001       henry     john        ->     0001     a database primer
                                          0002     building datawarehouse
                                          0003     teach yourself sql
  0002       johnson   mary        ->     0004     101 exotic recipes
  0003       bailey    harry       ->     0005     visiting europe
  0004       smith     adam

  then how the data on the "authors" table columns 'author_id' and 'book_d '?
  
  don't know how to frame the table 'authors '...
  
  It would become the relation 1-1... is it normal?
  
  Please help how data will be in the "authors" table
  
  Thank you

  You do not want to have a database template that you have illustrated below. Why? Well to start tt does not pass even the first normal form. Secondly, if you had ever updated the author's name, you will need to update in several places, which could lead to problems of data integrity. A database designed to reduce redundancy, the structure that you have proposed increases it.

  If you had been modelling a one-to-many relationship, it would be more appropriate:

  CREATE TABLE authors
  ( author_id  NUMBER        PRIMARY KEY
  , last_name  VARCHAR2(200) NOT NULL
  , first_name VARCHAR2(200) NOT NULL
  );
  
  CREATE TABLE books
  ( book_id NUMBER        PRIMARY KEY
  , title   VARCHAR2(200)
  );
  
  CREATE TABLE authors_of_books
  ( author_id NUMBER NOT NULL REFERENCES authors(author_id)
  , book_id   NUMBER NOT NULL PRIMARY KEY REFERENCES books(book_id)
  );
  

  This models your one-to-many relationship with a "join" table or "bridge." The drawing above gives you the ability to change the author freely or to book the title attributes in the same place increases your data integrity.

  However, a many-to-many relationship may be more appropriate since multiple authors can write a book. So you would change the tables authors_of_books as follows:

  CREATE TABLE authors_of_books
  ( author_id NUMBER NOT NULL REFERENCES authors(author_id)
  , book_id   NUMBER NOT NULL REFERENCES books(book_id)
  , CONSTRAINT authors_of_books_pk PRIMARY KEY (author_id, book_id)
  );
  

  I hope this helps!

• With a many to many relationship data in a table - recursive sql?

  Hello
  I'm trying to group data associated with a many to many relationships in a number of unique group using SQL only. The table looks like this.
  
  AMOUNT OF THE CHECK PLAN
  
  1 10
  A 15 2
  2 11 B
  3 12 B
  4 13 B
  4 16 C
  5 17 D
  
  The result should look like this. Since A is linked to 2, 1 and 2 correspond to the B and B are related to 3 and 4, 4 is related to C, these lines should be considered as a group. Any direction on where I should start looking for or if there is no function of Oracle that will be much appreciated. The version of oracle's 10g.
  
  CHECK THE PLAN AMOUNT GROUPID
  
  1-10-1
  2-15-1
  2 11 1 B
  3 12 1 B
  1 13 4 B
  4-16-1 C
  5 17 2 D
  
  
  
  CREATE THE TABLE PAS_DBA. GRPDEL
  (
  CHECKID VARCHAR2 (5 BYTE),
  PLAN OF INTEGER,
  AMOUNT NUMBER (6.2)
  );
  
  TOGETHER TO DEFINE
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  ('A', 1, 10);
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  ('A', 2, 15);
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  ("B", 2, 11);
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  ("B", 3, 12);
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  ("B", 4, 13);
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  ("C", 4, 16);
  Insert into PAS_DBA. GRPDEL
  (CHECKID, PLAN, SUM)
  Values
  (A ', 5, 17);
  COMMIT;

  Hello

  Good thing you're uisng Oracle 10. I don't think you could do this in pure SQL using any earlier version, but the CONNECT BY NOCYCLE feature, introduced in Oracle 10, makes this possible.

  WITH     got_groupname     AS
  (
       SELECT     checkid, plan, amount
       ,     MIN (CONNECT_BY_ROOT checkid)     AS groupname
       FROM     grpdel
       CONNECT BY NOCYCLE     (     checkid     =  PRIOR checkid
                         AND     plan     != PRIOR plan
                      )
                 OR     (     checkid != PRIOR checkid
                      AND     plan     =  PRIOR plan
                      )
       GROUP BY  checkid, plan, amount
  )
  SELECT       g.*
  ,       DENSE_RANK () OVER (ORDER BY groupname)     groupid
  FROM       got_groupname      g
  ORDER BY  checkid
  ,            plan
  ;
  

  Output:

  CHECK PLAN AMOUNT GROUPNAME GROUPID
  ----- ---- ------ --------- -------
  A        1     10 A               1
  A        2     15 A               1
  B        2     11 A               1
  B        3     12 A               1
  B        4     13 A               1
  C        4     16 A               1
  D        5     17 D               2
  

  You did not ask the groupname column, but I realized just to help show how it works. The subquery got_groupname associates each checkid with each other the checkid, regardless how many not deleted the two lines are. MIN finds the lowest checkid that each is bound, which generates a unique group identifier. Personally, I sould like usage of groupname as identifier. It tells you in the blink of an eye that B is a member of the same group has. However, it is not the same as that of a certain number, so if you need a number, you can derive from groupname with the analytical DENSE_RANK function.
  In many versions of Oracle, CONNECT BY queries do not work properly if they contain functions analyric. I don't know if this is the case in your version, but I don't think it's worth taking a chance. By CONNECT BY in a subquery no analytical function and then by the analytical function in a super-requete, we eliminate any chance of such a conflict.

  Thanks for posting the CREATE TABLE and INSERT statements; It is very useful.
  You want to be more useful? Do not publish the name of schema, PAS_DBA. Not many people who want to help you have a schema called PAS_DBA, and they probably won't create a. He probably doesn't. ' t help, either; probably, you connect PAS_DBA to create the table in any case.

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  Hello

  If you use Norton, which could interfere with the restoration of the system.

  Disable Norton while doing your system restore.

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• Is an extra Associative entity automatically created when we do a lot of many relationships?

  Hello

  I use SQL DEVELOPER DATA MODELER Version 4.0.2.840.

  My question is when we create many to-many between two main entities let PRODUCT and SALES (master). then we want to create a table associative entity SALES_DETAIL (details of sales)

  Is there an option that allows me to create an associative entity automatically with two associations of old masters. As it is automatically created with TOAD DATAMODELER.

  Thank you.

  Hello

  many-to-many relationship is transformed into associative array / intersection during the engineering to the relational model. If you add attributes to the relationship that they will turn to the columns of this table. Use "Show > attributes of the relationship" in the context menu of the diagram so that they are visible on the diagram.

  Philippe

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  I want to know if there are a lot of components such as adobe color and setting if install photoshop? What about other adobe products? We bought adobe vendor products and provide installation CD, but many components we do not want. Please help, thanks!

  You don't like the additional components, but many of them are essential and cannot be omitted and must they be removed after the fact.

  Mylenium

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