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Ok, it is true. The real relationshipo is N:M, because when the employee finish his job, he can begin new project. Thanks a lot.

This level is high level for me ;)

Thanks a lot for your answer. I can see this world is very complicated. No only the experience is very important, moreover they exist a lot of schools of notations. When i see all information in Internet, my head has a big explossion. I have a big luck finding this forum where all of you share...

Thanks for the link.

Thanks for the answers. I am learning a lot of things with your help.

In this case, the bank offer only one account to retired people

Thanks.

Yes. your experience is GOLD. Thanks a lot.

Ok, is it possible conceptual design 1:1 and conceptual design other type?

do you recomend this type of ISA end in Access like only one table ACCOUNTS BANK and the specific atributes of specific accounts can be empty unless we have a lot of accounts with this atribute empty?.... Sorry for my english ;)

Hi. In all my questions you recomendme the 1:1 relationships are bad idea because in the real world dont exist or the implementation are very complicated. Now i am studying eer new types. Superidentities with subidenties. In ER the model would be this. This model is account bank types from...

I am trying it.. This world is very complicated for me ;)... Thanks a lot for your support. I am learning a lot of things with you and the others here...

The empleoyees can working on only 1 project. But several empleoyees not work any project. The projects have one or more workers. Hi. I wanted listen opinions about this model. 1º Question. Its better put the atributes worker's rol and begining date on the project, on the relationship or on the...

In Spain, people can have one DNI (National Identity Document) throughout their lifetime, and a DNI always belongs to a single person. The DNI cards are renewed every 5 years, and this is mandatory. Attached is the ER model that I think is suitable for this issue. I have included the 2 entities...

I need a tracking each renewal. This is the picture about this. My question si After this, when i put "date renovation" on relationship, change this the cardinality?, changing 1:1 to n:M? Thanks

I have doubts about what happens when adding attributes to a 1:N or 1:1 relationship. I understand that if I add attributes, in the relational model, this relationship would be treated as if it were an N:M relationship, creating a table for this purpose. For example, in a 1:1 relationship...

Very nice help. Thanks. I am studying your information.

Incredible answer. I am working in it. But i think you are an expert teacher with your explanations. Thanks a lot.

Thanks for your recomendation of using google and youtube.