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.
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