The MERGE command synchronizes two tables by adding, removing, and modifying target table rows based on the source table’s join condition. In other words, when
Category: SQL Server
Entity Integrity Constraints
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
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
Domain Integrity in SQL Server
Domain integrity assures that every data in a field contains legitimate values, is established by the permitted values of an attribute. Data types such as
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
UPDATE and DELETE in SQL Server
This article is meant for people who are just learning SQL. DML commands typically touch the database through apps; users don’t sit down and manually
Big Data & SQL 