Aggregating Data by Month Overlapping Entities with PostgreSQL

Counting Transactions Before Each Time in Hive Using Window Functions and MERGE Statements

Finding Total Time Difference Between Child Records Belonging to Specific Parent IDs in MySQL with Grouping

Understanding MySQL's COUNT Function: Avoiding NULL Returns When Counting Records Based on Specific Conditions

Understanding Group by SUM in MySQL: A Comprehensive Guide to Calculating Sum of Column Values per Unique ID

Assigning Invoice IDs to Uninvoiced Entries Using Window Functions in SQL

Conditional Aggregation Solution for All Statuses as 1

Understanding Aggregate Functions in Having: Unlocking MySQL's Extended SQL Features for More Efficient Querying

Filling Missing Dates with Time Range in MySQL Using Recursive Queries and Left Joins

Aggregating Count Data with R's data.table Package