Grouping by in R as in SQL: A Deep Dive into Data Manipulation and Joining

Aggregating Time Series Data by Sector Using Pandas in Python

How to Remove Duplicates from Multiple Joined Arrays in Postgres Using Knex

Connecting Two DataFrames with Named Aggregations Using pandas

Decomposing Time Series Data in R using stats Package and data.table Alternative Methods

Understanding Custom Aggregation Functions in Dask's GroupBy Method