What is UNIQUE Constraint in SQL


The UNIQUE constraint uniquely identifies each row in a table. The restriction which unique enforces in the Uniqueness of values with respect to any column. The UNIQUE and PRIMARY KEY constraints both provide a guarantee for uniqueness for a column or set of columns. A PRIMARY KEY automatically has a UNIQUE key defined on it. … Read more

Integrity Constraints in DBMS | SQL


Integrity constraints in DBMS Integrity in data means maintaining and assuring the accuracy and consistency of data over its entire life cycle. Database Systems ensure data integrity through Integrity Constraints in DBMS that are used to restrict data that can be entered or modified in the database. Constraints are used to limit the type of … Read more