About this document
SQL Integrity Constraints Explained by vsn200303 is a document available to read on EtoBox.
Chapter 5 discusses integrity constraints in databases, which are rules that ensure data validity and consistency in tables. It outlines various SQL constraints such as NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, CHECK, and DEFAULT, along with their definitions and examples of how to implement them. Additionally, it explains how to add and drop constraints using ALTER TABLE statements and how to retrieve information about constraints using the SHOW CONSTRAINTS command.
- Author
- vsn200303
- Language
- EN