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The balance between spending flows into a country and spending flows out of that country is Jcalled a country's
Primary Key
A primary key is a unique identifier for each record in a database table, used to ensure that each entry is distinct and retrievable.
Principal Key
Another term for primary key, an attribute or set of attributes that uniquely identifies each record in a database table.
Foreign Key
An attribute in a database table that provides a link between data in two tables, typically to enforce referential integrity.
Main Key
A unique identification attribute or field in a database, functionally identical to a primary key.
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