- A Table record in first table is related to only one record of second table.
- Example: Country has a capital city
- One to many
- A Table record in first table is related to more than one record of second table. But second table record maps to only one entry of first table
- NocoDB refers to this category of relationship as **has many**
- For every **has many** relation defined, NocoDB augments **belongs to** relationship column in the other table automatically
- For every **has many** relation defined, NocoDB augments **belongs to** relationship column in the adjacent table automatically
- Example: Country **has many** Cities. (other way mapping > City **belongs to** Country )
- Many to many
- A Table record in first table is related to more than one record of second table; second table record can also map to more than on record of first table.