As I get deeper into SQL, today’s focus was on logical filtering operators — AND, OR, and NOT. These are the building blocks for refining queries and narrowing down datasets. By mastering these logical filtering operators, I can create more precise queries that yield the exact results I need. Understanding these filtering data techniques in SQL not only enhances the efficiency of data retrieval but also enables better insights from the information available. The ability to combine multiple conditions will significantly improve my data manipulation skills as I continue my SQL journey.
Right now, I’m practicing how multiple conditions interact:
ANDensures all criteria are met.ORallows flexibility when any of the criteria is true.NOTexcludes specific matches.
💡 Practical Example Idea: Imagine filtering a patient dataset to find only those over 65 AND with a diagnosis of Type 2 diabetes, OR excluding patients on certain high-risk medications.
Still early days, but this is a good foundation for building more precise clinical queries later.