what is the purpose of primary key
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Primary key additionally called a primary keyword, is a key in a social database that is unusual for each record. It is a one of a kind identifier, for example, a driver permit number, phone number (counting territory code), or vehicle identification number (VIN). A relational database should dependably have one and just a single primary key.
The fundamental reason for a primary key is to execute a connection between two tables in a relational database; it's not called a relational database for anything! All the more particularly, the primary key is the "target" which a foreign key can reference.
The fundamental reason for a primary key is to execute a connection between two tables in a relational database; it's not called a relational database for anything! All the more particularly, the primary key is the "target" which a foreign key can reference.
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