the foreign key referential between two tables.
In sql you use primary key more than one column in a table
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The key foreign policy makers are?
Yes it could. It would have a primary key for its own use and it could then have a foreign linking it to another table. If it is only linked to one other table, then it would only need one foreign key. It is also possible to have the same foreign key linking to more than one table.
yes .a foreign key can have null values
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We designate one of the candidate key of a relation to be a primary key because that primary key is use for any foreign key references.
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False. A foreign key is a primary of one table that is in another table. A foreign key can be repeated, so it does not uniquely identify records in the table where it is a foreign key.
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