#Aggregations

Advanced pandas GroupBy and Window Functions Dataset Setup All examples use a retail sales dataset with transactions across stores, regions, and product categories. import pandas as pd import numpy as np np.random.seed(42) dates = …

pandas groupby() — A Practical Guide What is groupby()? groupby() splits a DataFrame into buckets based on one or more column values, lets you run a function on each bucket independently, then stitches all the results back together into one …

SQL Basics & Query Patterns Master the fundamentals of SQL with practical examples and essential patterns for data retrieval, filtering, and manipulation. This guide covers core concepts that form the foundation of database operations. …