Merging Dataframes of Unequal Length Based on Nearest DateTime: A Flexible Approach

Performing Case-Insensitive Joins on Keys with Non-Alphanumeric Characters in Python Pandas

Handling Missing Values During DataFrame Merging with Pandas

Understanding Dataframe Joining in R: A Deep Dive

Merging Pandas DataFrames Based on Two Columns with the Same Pair of Values but Different Orders

Here is a complete code snippet that combines all the interleaved code you wrote in a nice executable codeblock:

Append Rows of df2 to Existing df 1 Based on Matching Conditions

Merging Dataframes in R without Duplicates: A Step-by-Step Guide

Merging Columns and Rows of Dataframes Based on Common Index Value

Merging Multiple Data Frames in R: A Comprehensive Guide