When placing a foreign key for a 1:1 relationship,the key of either table can be used as the foreign key in the other table.

Name: When placing a foreign key for a 1:1 relationship,the key of either table can be used as the foreign key in the other table.
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In a 1:1 relationship, either table can use its own primary key as the foreign key in the other table. This is because there can only be one related record in the other table for each record in the current table.

When Placing a Foreign Key for a 1:1 Relationship,the Key