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Matching row 

A row in the referencing table is called a matching row of a row in the referenced table if the values of the corresponding referencing and referenced columns are identical.

A referential CONSTRAINT definition defines a 1:n relationship between two tables. This means that more than one matching row can exist for each row in the referenced table.

A row in the referenced table in a referenced column cannot be changed if at least one matching row exists.

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