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.
Your Previous Searches
Random Picks
- Greedy Algorithms: Greedy algorithms are a class of algorithms that make the locally optimal choice at each step with the hope of finding a global optimum. In other words, the algorithm selects the best option at each step without considering the future conse ... Read More >>
- Feature Engineering: Feature engineering is the process of selecting and transforming variables (features) in a dataset to improve the performance of machine learning models. It involves identifying the most relevant features for a given problem, creating new f ... Read More >>
- Aggregation: Aggregation is a process in data science that involves the collection, gathering, and summarization of data from multiple sources. It is a crucial step in data analysis as it helps in understanding the overall trends and patterns in the dat ... Read More >>
Top News
Employees were already freaked out about AI — Amazon just proved them right...
Amazon CEO Andy Jassy acknowledged in a Tuesday statement what many workers have been scared of: Artificial intelligence will soon mean job cuts....
News Source: Business Insider on 2025-06-18
Trump’s purges come for the U.S.’ nuclear safety board...
Donald Trump’s efforts to strip federal agencies and commissions of their independence took an alarming step Monday, when the president fired one of the five commissioners who sit on the Nuclear Reg...
News Source: MSNBC on 2025-06-17
Amazon says it will reduce its workforce as AI replaces human employees | CNN Bu...
Amazon says it will reduce its workforce as AI replaces human employees | CNN Businesscnn.com...
News Source: CNN on 2025-06-17
Amazon’s Jassy says AI will reduce company’s corporate ranks...
Andy Jassy expects the company’s workforce to decline in the next few years....
News Source: Fortune on 2025-06-17
Bank of America is bullish on these 4 under-the-radar AI stocks...
Investors interested in the AI trade beyond the Magnificent Seven should look into these four stocks with breakout growth potential....
News Source: Business Insider on 2025-06-17