You can do it by several ways but the standard in the relational database model is like this
1)One-to-One:it can be implemented in a single table and or sometimes can be possible in two tables with primary and foreign key.
2)One-to-Many:it can be implemented by splitting the data into two tables with primary key and foreign key.
Many-to-Many:it can be implemented using a combination of tables with the keys from both the tables forming the composite primary key of the combined table.