A better understanding of the relations beetween database tables

Posted by Nistor Alexandru on Stack Overflow See other posts from Stack Overflow or by Nistor Alexandru
Published on 2012-10-18T10:58:36Z Indexed on 2012/10/18 11:00 UTC
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mysql

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sql

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sql-server

Hi I am trying to get a better understanding of relational databases and there is something that I keep bumping into and don't understand.Let's take this two tables:

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In this case Login.ID is the primary key with auto_increment set and Profile.ID_LOGIN is the Foreign KEY.When a user is created and it's username and password is stored in the login database does the ID coresponding to the curesnt username and password get automaticly added into ID_LOGIN or do I have to create an SQL statement to do this?

If I have to create a SQL statement how should I aproach adding the ID_LOGIN to make sure I am adding it corectly?

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