SQL Server Merge Operation: A Comprehensive Guide to Updating and Inserting Data

Extracting Last Element from JSON Array in Transact SQL Using OPENJSON and ROW_NUMBER

Understanding Left Joins and the Impact of WHERE Clauses in SQL

Querying Employee Employment History: Handling Active Employers and Most Recent Records

Understanding Source Tables and Staging Tables: A Comparison of Approaches for Efficient Data Load and Integration in ETL Processes

Understanding the Challenge: Calculating Differences from Nested Subqueries with Optimized Solutions

SQL Concatenation using Case Statement: A Comparative Analysis of Two Approaches

Resolving Duplicate Records in Data Integration: A Comparative Analysis of Row Numbers and RANK()

T-SQL Aggregation of Overlapping Date Times From Large View: A Scalable Solution

Resolving Gaps and Islands in SQL Queries: A Difference of Row Numbers Approach