Solving Duplicate Rows in SQL: The Importance of Matching GROUP BY and SELECT Clauses

Mastering SQL Server's Date and Time Functions for Accurate Querying

Returning Comma-Separated Email Addresses in SQL Server Using STUFF and XML PATH

How to Get First Record (Earliest VALIDFROM) and Last Record (Latest VALIDTO) for a Specific Staff ID in SQL

Overcoming CTE Limitations: Using Table Variables and Temp Tables in Stored Procedures

Best Practices for Creating T-SQL Triggers That Audit Column Changes

Understanding the SQL Problem with IN Keyword in Stored Procedure

How to Aggregate Events by Year in SQL Server with Conditional SUM Statements

Mastering SQL Joins and Subqueries: A Comprehensive Guide to Optimized Queries

Understanding the Challenge of Inserting a Value from a Select Statement for a Non-Identity Column: Solutions for SQL Server and Oracle Databases