Composite Key
In data science, a composite key is a combination of two or more columns in a table that can be used to uniquely identify each row in the table. The composite key is created by concatenating the values in the columns that make up the key. This is useful when a single column cannot uniquely identify a row, but the combination of multiple columns can. Composite keys are commonly used in database design and data modeling to ensure data integrity and to establish relationships between tables. They are also used in machine learning algorithms to group data points based on multiple features or attributes.
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