Engineering adds columns for relationship
I absolutely cannot understand the logic of the advanced engineering process.
Why it adds ADDITIONAL PK columns in my tables with a relationship?
For example, two tables: CLASS (class_id, name) and TYPE (type_id, class_id) with the 1-N relationship (class.class_id - type.class_id).
After engineering model logical relationship, in a last I can see new columns:
Class.class_id1, type.class_class_id1
How to avoid it? I want to use my own columns for relationship!
Hello
you have not a primary key for the entity in the logic model CLASS - that's fine. However, you have a PK existing in the table of CLASS in order to have the foreign key of the table TYPE of the table CLASS in the relational model.
So new surrogate key column is created - model default naming is {abbr table} _ID and since you have abbreviation table he takes the name of the table and creates the CLASS_ID column and it becomes CLASS_ID1 because you already have a column CLASS_ID.
For the creation of TYPE table - column foreign key referring to the assignment of default namespace model column - CLASS_ID1 is {table Ref} _ {Ref column} - this is how the name of the column has the value CLASS_CLASS_ID1.
If you don't want to create primary identifiers in the logic model, then you should not add attributes PK and FK in related entities - PK/FK columns will be automatically created during the engineering to the relational model - you will need to define related templates.
Otherwise, you can create identifier PK and related attributes added to FK attributes and it will continue automatically.
Philippe
Tags: Database
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= Adg_test_renderer.mxml START =.
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Copyright (c) 1982, 2014, Oracle. All rights reserved.
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