(RATIONAL DATABASE SYSTEMS)
Type the database used many in this time is type RDBMS ( Relational Database Management System).
Database with this type don't only solely function to saving data only, but take care of integrity of data.
Primary Key ( Unique Key)
In rational design database Primary Key is locking the proxy ( candidate key) to identified line (row) unique inlay tables
Foreign Key
In rational design database Foreign Key is locking reference from table which related.
Foreign key is field key owning the reference to primary key [at] other tables which related
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