Table Constraints

Table constraints are rules that define how data in a database table should behave or relate to ensure accuracy and consistency. For example, a "primary key" must have unique, non-empty values for each row, preventing duplicates. "Foreign keys" ensure relationships between tables are correct by referencing existing entries. Other constraints, like "not null," prevent missing data. These rules help maintain data integrity, making sure the information stored is reliable, accurate, and follows the intended structure.