Left Join
In data science, a left join is a type of join operation that combines two datasets based on a common key, while including all the rows from the left (or first) dataset and only the matching rows from the right (or second) dataset. In other words, a left join returns all the records from the left table and the matching records from the right table. If there is no match, the result will contain null values for the right table columns. Left join is a useful operation for merging datasets and analyzing data relationships.
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