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  Tutorial: PHP Database Related Data Integrity using MySQL and PHP Tutorial

This is an overview of relational database concepts, specifically MySQL. It illustrate each of the concepts through simple examples.

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Data Integrity using MySQL and PHP

While the word "integrity" connotes "wholeness", it's important to understand what it means specifically in the case of relational database design. Failure to ensure data integrity can result in the database returning incorrect results, or in data becoming unretrievable. This is true of all relational databases, not just MySQL. Fortunately, the principles of data integrity are not difficult to understand. How difficult they are to implement in MySQL and PHP will depend in large degree on how many tables and relationships the database has. This article will start with an overview of relational concepts, and then illustrate each of the concepts with simple examples.

It should be noted that MySQL 3.23 supports the ANSI standard foreign key syntax in the CREATE TABLE statement simply to allow CREATE TABLE scripts from other vendor's databases to execute, but MySQL does not actually support any foreign key functionality. TcX provides many reasons for this in their online documentation, but the bottom line is that doing so would make MySQL slower, less convenient to administer, and much more complex internally.

A Crash Course in Data Integrity
There are two types of data integrity that this article will cover, entity and referential. The first addresses the integrity of rows (records) within a single table. The second addresses the integrity of related rows in different tables.


 

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PHP Database Related Data Integrity using MySQL and PHP Tutorial

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PHP Database Related Data Integrity using MySQL and PHP Tutorial

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