Final answer:
In a network data model, each record can have multiple parent and child records. This model allows for many-to-many relationships, unlike the hierarchical model, which is more rigid. The relational model, which uses tables, is the most common and differs from both network and hierarchical models.
Step-by-step explanation:
In a network data model, each record can have multiple parent and child records. Unlike the hierarchical model where a strict tree structure is followed, the network model allows for a more flexible schema with the possibility of many-to-many relationships. This means a single record, which could be a node in the network, can be linked to multiple parent records, not limited to a single parent like in a hierarchical model, and can also have multiple child records.
The relational data model differs from both network and hierarchical models by using tables (relations) where data is stored in rows and columns. Relationships in a relational database are established through foreign keys, and not by explicit pointers like in the network or hierarchical models. The relational model is the most commonly used database model today because of its flexibility, simplicity, and robustness.