juniorT-SQL
What is WHERE clause in T-SQL?
Updated May 17, 2026
Short answer
WHERE filters rows based on conditions.
Deep explanation
It restricts result sets using logical conditions and is applied before grouping or ordering.
Real-world example
Filtering employees belonging to IT department.
Common mistakes
- Using WHERE after GROUP BY incorrectly.
Follow-up questions
- Can WHERE use functions?
- Difference between WHERE and HAVING?