Project #1 - Simple Guestbook

PHP Project #1 - Simple Guestbook
Goal: Create an online guestbook where people can put in their name and comment.  It will then be put into a database.  Then below the form, it will display all the comments in the guestbook with the newest one on top.

Things to work on:  The PHP does not sanitize. 

Code

MYSQL commands

A list of commands used in MYSQL.  The more commands I learn, the more I'll add to the list.

Create a database

CREATE DATABASE [databasename];

Show all tables in database

show tables ;

To make a database your active database

USE [databasename];

Create a table

CREATE TABLE [tablename] ( [col(1)title] [type] , [col(2)title] [type] ,...,[col(n)title] [type]) ; 

Insert data in to table

INSERT INTO [tablename] ( [col(1)title], [col(2)title],..., [col(n)title] ) VALUES ( [dataforcol(1)], [dataforcol(2)],..., [dataforcol(n)],);

Shows the structure of the table

DESCRIBE [tablename];

Show all data in table

SELECT * FROM [tablename];

Show specific data (x)  in table

SELECT * FROM [tablename] WHERE [col_title] = "[x]";

Add a column (in front)

ALTER TABLE [tablename] ADD  [col_title] [type] FIRST;

Add a column (anywhere after col(N) )

ALTER TABLE [tablename] ADD [col_title] [type] AFTER [col(N)title];

Delete a column

ALTER TABLE [tablename] DROP [col_title];

Change column type

ALTER TABLE [tablename] MODIFY [col_title] [type];

Change column name (and type)

ALTER TABLE [tablename] CHANGE  [old_col_title] [new_col_title] [type];

Delete data entry/row

DELETE from [tablename] WHERE [col_title] = '[element]';

Delete all data in table

DELETE from [tablename];