Three main types of relationships can exist between entities: a one-to-one relationship,abbreviated 1:1;a one-to-many relationship,abbreviated 1:M;and a many-to-many relationship,abbreviated M:N.

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This statement is true. There are three main types of relationships in database design - one-to-one, one-to-many, and many-to-many. They are commonly abbreviated as 1:1, 1:M, and M:N respectively.

Three Main Types of Relationships Can Exist Between Entities: a One-To-One