Common Key

In data science, a common key is a shared attribute or field between two or more datasets that is used to merge or join them together. The common key is typically a unique identifier that exists in both datasets, allowing for the creation of a single, unified dataset that combines the information from both sources. This process is commonly used in data integration and data warehousing, where multiple datasets need to be combined to provide a more complete picture of a particular domain. The common key can be a simple attribute, such as a customer ID or product code, or it can be a composite key made up of multiple attributes that together uniquely identify a record. The use of a common key is essential for accurate and efficient data analysis, as it ensures that the correct records are matched and combined.
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