Web Reference: Merge DataFrame or named Series objects with a database-style join. A named Series object is treated as a DataFrame with a single named column. The join is done on columns or indexes. If joining columns on columns, the DataFrame indexes will be ignored. Dec 10, 2025 · The merge () function is designed to merge two DataFrames based on one or more columns with matching values. The basic idea is to identify columns that contain common data between the DataFrames and use them to align rows. Definition and Usage The merge() method updates the content of two DataFrame by merging them together, using the specified method (s). Use the parameters to control which values to keep and which to replace.
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