Entity integrity makes sure that there aren’t any duplicate records in the database and that each record’s identifying field is distinct and never null. The
Tag: Integrity Constraint Types
Referential Integrity Constraints
A foreign key must match a primary key or be null in order to maintain referential integrity. In other words, every column in a base
Integrity Constraints – Overview
This post is intended to introduce integrity constraints, their need and their usage in SQL. Integrity constraints are pre-defined sets of guidelines used in Database
Big Data and SQL 