What are primary key and foreign key and how they work?
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Answer Posted / Mintu Kumar
"A Primary Key is a unique column or set of columns in a table that can be used to identify each row uniquely. It ensures data integrity by enforcing a constraint that requires each value in the primary key column(s) to be unique. A Foreign Key, on the other hand, is a field or set of fields in one table that refers to the Primary Key of another table. It establishes a relationship between two tables and helps maintain data integrity by enforcing referential integrity constraints."
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