Understanding Customer Purchase Behavior in PostgreSQL: A Step-by-Step Guide to Identifying Repeat Customers

How to Use Window Functions for Complex Queries: Partitioning Rows Based on a Column and Applying a Row Number or Rank in PostgreSQL

Rounding Notebooks by Size: A Step-by-Step Guide to Allocation and Grouping

Selecting Friends from Friend Requests Using SQL

Understanding PostgreSQL Subqueries in Expressions: Simplifying Boolean Logic for Efficient Query Execution

Calculating Date Differences: A Step-by-Step Guide

Mastering SQL GROUP BY: How to Filter Sessions by Multiple Interactions

Finding Occurrences and Missing Values in Postgres Arrays: A Comprehensive Guide

How to Group Duplicate Values Using json_agg() and Transform Output into Nested Array in PostgreSQL

Converting SQL Subqueries to Hibernate Query Language (HQL): A Deep Dive