Step-by-Step Guide to Merging DataFrames Using Pandas in Python

Understanding the MERGE Statement: Can PostgreSQL Activate Multiple WHEN MATCHED AND Conditions Simultaneously?

Mastering Pandas Merging: A Step-by-Step Guide to Combining Multiple Datasets

Vertical Merging of Pandas Series: A Step-by-Step Guide Using Python and Pandas

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

Merging Multiple Date Columns in a Pandas DataFrame: A Comparative Analysis of melt() and unstack() Methods

Iterating Over Rows in a Pandas DataFrame Using Date Filter

Joining Single-Level Table to Multi-Level Table in Python: A Step-by-Step Solution

Improving Pandas Outer Joins and DataFrame Naming Consistency

Replacing Missing Values in Pandas DataFrames Using Ffill and Groupby