What does a hard one-to-one relationship mean (one where the relationship on both ends is "must")?
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Answer / Sheo Kumar Gautam
A hard one-to-one relationship ensures that each row in the parent table must have exactly one corresponding row in the child table and vice versa. This means that a foreign key in the child table references the primary key of the parent table, and there is an unique constraint on the corresponding columns in the child table.
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