#21 MySQL Tutorial for Beginners | Composite Key

Опубликовано: 19 Ноябрь 2020
на канале: Md Fakhrul Alam Sajib

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A primary key having two or more columns/fields/attributes is called composite key. Composite key is a combination of two or more columns. A composite key is useful when the table needs to identify each record/row/tuple with more than one attribute uniquely.

A column used in the composite key can have different data types. Therefore, it is not required to be the same data type for the columns to make a composite key in MySQL.

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