Left Joins

In data science, a left join is a type of join operation that combines two datasets based on a common key, and returns all the records from the left (or first) dataset and matching records from the right (or second) dataset. In a left join, if there are no matching records in the right dataset, the result will still include all the records from the left dataset, with null values in the columns from the right dataset. Left joins are commonly used in data analysis and data cleaning tasks, where it is important to retain all the data from the primary dataset, even if there are missing values in the secondary dataset.
Your Previous Searches
Random Picks
  • Triangulation: Triangulation is a method used in data science to improve the accuracy and reliability of results by combining multiple methods or data sources. It involves the use of at least three independent sources of data or methods to verify or cross ... Read More >>
  • Technology: In the context of Data Science and Artificial Intelligence, technology refers to the tools, techniques, and methodologies used to collect, process, analyze, and interpret data. This includes hardware such as computers, servers, and storage ... Read More >>
  • Join: Join is a database operation that combines rows from two or more tables into a single table based on a related column between them. In data science, joining is a common technique used to combine data from multiple sources to create a unifie ... Read More >>
Top News

Chinese AI startup Manus scores funding at $500 million value...

Like DeepSeek, Manus sparked questions about the US lead on artificial intelligence — this time in a product category that American tech companies see as a key investment area...

News Source: Bloomberg on 2025-04-25

Google's parent begins year with robust growth despite legal, competitive and ec...

Google’s profits soared 28% in this year’s opening quarter, overcoming the competitive and legal threats that its internet empire is facing amid an economy roiled by a global trade war...

News Source: ABC News on 2025-04-24

Alphabet reports first-quarter earnings that exceed initial expectations and cre...

Alphabet, the parent company of Google, reported its first-quarter earning results on Thursday....

News Source: Business Insider on 2025-04-24

Google's Gemini usage is skyrocketing, but rivals like ChatGPT and Meta AI are s...

Google's Gemini usage data was revealed this week by the tech giant during a court hearing in the company's internet search monopoly case....

News Source: Business Insider on 2025-04-24

Amazon and Nvidia say AI data center demand is not slowing down...

OKLAHOMA CITY — Amazon and Nvidia executives said Thursday that the construction of artificial intelligence data centers is not slowing down, as recession fears have some investors questioning wheth...

News Source: NBC News on 2025-04-24