Question

explain primary key and foreign key..

Answer 1

primary - a primary key is a column or group of column that uniquely identify a row .

foreign - a foreign key is a column or set of columns in one table

Answer 2

Answer:

A primary key is a special key which uniquely identifies each record in a table. It is very important in the relational database to have a unique identifier in each row of a table and primary key is just the thing you need to uniquely identify a tuple within a table.

A foreign key refers to a field or a collection of fields in a database record that uniquely identifies a key field of another database record in some other table. In simple terms, it establishes a link between records in two different tables in a database.

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