Question: what are the different types of relationships represented in a data model?
Answer: Data Models use three types of relationships: one-to-many, many-to-many, and one-to-one. Database designers usually use these notations: 1: M or 1.. *, M:N or “..” or 1:1 or 1..1 respectively. M:N relationships cannot be implemented as such in the relational model, they have to be changed into two 1:M relationships.