Final answer:
It is false that relationships between tables must be created and defined before adding data. While relationships such as foreign key constraints help maintain referential integrity, they can be set up after data is added to the tables.
Step-by-step explanation:
The statement that the relationships between tables must be created and defined before any data (rows) can be added is FALSE. It is possible to insert rows of data into tables without having defined relationships between the tables. However, defining such relationships is crucial for enforcing referential integrity and for the purposes of accurately querying related data once multiple tables are populated with records. In relational databases, relationships are typically established by using foreign keys that refer to primary keys in another table. These relationships can be defined after data is populated, though care must be taken to ensure that the existing data conforms to the constraints imposed by the new relationships.