A referential integrity constraint is specified between two tables. Updated on April 05, 2020 Referential integrity is a database feature in relational database management systems. To understand this clearly let us take an example of student relation: Student(Student_id, name, depart_name) Here, we can see that student relation has the attribute depart_name. In the Referential integrity constraints, if a foreign key in Table 1 refers to the Primary Key of Table 2, then every value of the Foreign Key in Table 1 must be null or be available in Table 2. Referential integrity ensures that the values for a set of attributes in one relation must also appear the same for the particular set attributes inanother relation. Then the Departmentrelation must also have a tuple that would have depart_name attribute … Integrity constraints in Database Management Systems (DBMS) are a set of rules that are applied on the table columns or relationships to ensure that the overall validity, integrity, and consistency (i.e. Now suppose, we have a student tuple with the depart_name value as Chemistry. It ensures the relationships between tables in a database remain accurate by applying constraints to prevent users or applications from entering inaccurate data or pointing to data that doesn't exist. the quality) of the data present in the database table is maintained.
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