Identifying relations to simulate M:N relation with attributes

Hi,
I'm always using 3.1.4
In this version, M:N relations don't support attributes. In 3.3 it is supported. But sometimes, it's necessary in a logical model to have an entity which represent the relation. So I can add another relation between this "associative entity" and another entity. Like in Oracle Designer, if i want to create a M:N relation with attributes, I have to create an entity with two identifying relations
So I created :
Student, Registration and Stage entities
Identifying relation between Student and Registration
Identifying relation between Stage and Registration
Registration with several attributes. So Registration is an "associative entity".
But when I do this in DM :
In Registration entity, there are two unique identifiers
the first one (which is PUID) is correct, it references the two relations
The second is incorrect. It should not to exist.
is it right ?

3° create entity Registration, with one column : dateRegistration (NOT primary UID)I assume there is a UID created (not set as PK) and it's over dateRegistration attribute
2° create entity Stage, with 2 columns : Numero (primary UID), code, descriptionyou write 2 columns, but 3 are listed, the number is not important just to confirm that Primary UID is created on Numero attribute.
So entity Registration has one UID before identifying relationships are created. You need to check setting in "Preferences>Data Modeler>Model>Logical>Use and set first unique key as primary key"
One Primary UID only exists in Registration in case it's checked, and there is one Primary UID (over both relationships) and one UID over dateRegistration attribute in case it's not checked.
Philip

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user11018268 wrote:
Hello,
How to join 2 tables which are not related with any primary key foreign key constraint.
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From both the table i want the data,which i need to use in curosr to display finally as "Address Label".
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Identifying relations to simulate M:N relation with attributes

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