Key

In Data Science, a key is a field or set of fields that uniquely identifies a record in a database table. Keys are used to establish relationships between tables and to ensure data integrity. There are several types of keys, including primary keys, foreign keys, and composite keys. A primary key is a unique identifier for a record in a table, and it cannot contain null values. A foreign key is a field in one table that refers to the primary key in another table, establishing a relationship between the two tables. A composite key is a key that consists of two or more fields, used when a single field cannot uniquely identify a record. Keys are essential in data modeling and database design, as they ensure that data is organized and can be accessed efficiently.
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