Conceptual modeling is a creation ER-diagram. ER-diagram it is graphically representing the logical relationships of entities. It is easier to work because you can differentiate amongst our visual communication entities. At this stage, the design we show the relationship between entities.
There are several types of communication: 1. One-to-one; 2. One-to-many; 3. Many-to-many; Linking each entity his primary key to become foreign key to another entity. Further to be able to work with these linked tables.
Below is a ER-diagram of my database:
