i_simplify on Instagram: "Day 25 – Constraints in SQL When there are no rules, everything turns into chaos. In SQL, Constraints are the rules that keep your data clean, valid, and reliable. Day 25 of SQL Series 🚀 Understanding constraints is the first step toward building strong databases. 📝 TOPIC NOTES Constraints are rules applied on table columns They control what type of data can be stored Prevent invalid, duplicate, or empty values Help maintain data accuracy and integrity Common constrai