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  Tutorial: PHP Database Related SQL Theory & How-To Tutorial

This article addresses two SQL-related issues in PHP: 1) Creating complex, powerful, queries to take advantage of your table schemas, and 2) Building those queries on the fly according to user input.

Tutorial Details:

SQL Theory & How-To

I try and wade through as many postings on PHP General as possible throughout the day. Everything from "What does $$var mean?" to "How to I redirect someone to another page?" pop up. Two common problems pop up on the list frequently, one is "How do I build complex queries on the fly?", and the other is the problem of how to fully utilize all those cool features in your DB.

So here is what I plan to tackle in this article:
1.) Creating complex, powerful, queries to take advantage of your table schemas
2.) Building those queries on the fly according to user input

My main beef with people on the list is that they don't learn things in the proper order. They want to know how to redirect people without necessarily understanding what a "header" is much less what "302" means.

The same goes for SQL - there is an underlying theory behind SQL, called "Relational Algebra". If you took any math classes beyond Math 101 then you have most likely played with its general theories.


 

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