Creating Multiple Columns with 0/1 Counts Based on Another Column in R Using Base R, dplyr, and tidyr

Understanding PostgreSQL Aggregate Values Based on Date: A Practical Approach to Counting Subscribers Per Month

Solving Date Manipulation Challenges: Counting Sessions by 15-Minute Intervals in Business Days

Retrieving Minimum Dates from SQL Databases While Ignoring Default Dates

Aggregating Data with One-To-Many Relationships in PostgreSQL Using JSON Functions

Calculating Sums in SQL: Best Practices for Efficient and Accurate Results

Polygon in Polygon Aggregation in R: A Powerful Technique for Spatial Analysis

Joining Subqueries as Where Arguments: A Powerful Technique for Filtering Data

Combining Multiple Time-Series Data Frames into One Column by Date

Optimizing Groupby and Aggregate Operations in Pandas for Performance and Efficiency