Using Conditional Aggregation in SQL Server: Advanced Data Analysis Techniques

Understanding Hierarchical SQL Queries for Unioning Tables

Understanding the Atomicity and Isolation of Common Table Expressions (CTEs) in T-SQL Stored Procedures: A Deep Dive into Atomicity and Serializable vs Repeatable Read Isolation Levels.

Update Duplicate Data in Databases Using Self-Join and MERGE Statement

Understanding T-SQL and Addressing the Error in the FINDPEOPLE Procedure for Performance Improvement

Understanding Deadlocks and Transaction Management in SQL Server to Prevent Performance Issues and Ensure Data Integrity

Update Record Only if CROSS APPLY Returns Single Value in SQL Server

Pulling Previous Month Data from SQL Server 2016 Using the LAG Function

Understanding the Impact of the EXISTS Clause When Comparing Stored Procedure and Query Count

How to Use ROW_NUMBER() with PARTITION BY for Complex Data Analysis