Updating a Database Table to Preserve Duplicate Values While Inserting New Data

Understanding SQL Joins and Filtering Null Records Efficiently

Ranking Subcategories While Preserving Order of ID Using CTEs and Window Functions in SQL

Finding Top 2 Customers by Maximum Amount of Transaction in Oracle DB: A Comprehensive Guide

Understanding WooCommerce Post Meta Data Array

Matching Substrings from Delimited Values to Records in Two Tables and Building a Join with MySQL's FIND_IN_SET Function

Joining Two Tables with Comma-Delimited Keys: Efficient SQL Solution for Data Summation.

Combining Two Tables on Keys of Another Table Without All Combinations Using Subqueries, UNION ALL, and Grouping.

SQL Query to Count Elements and Find Maximum Count for Each Group Using Self-Join with Subquery and CTE with Row Number Window Function

SQL Query to Calculate Customer Tenure with Cooldown Period Logic