MySQL

No necessarily, PHP can be used on various other web servers, not just Apache, but Apache is the most popular. MySQL is a stand-alone database engine and is used by a lot of other stuff, not just PHP apps.

To draw an ER diagram for a forest management system, start by identifying the key entities such as Trees, Species, Forest Areas, Managers, and Wildlife. Define the relationships between these entities, for example, a Tree belongs to a Species and is located in a Forest Area, while a Manager oversees these areas. Use rectangles to represent entities, diamonds for relationships, and ovals for attributes. Finally, ensure to indicate cardinalities to show the nature of the relationships, such as one-to-many or many-to-many.

You don't really expect an answer here, do you?

PRO:

fairly easy syntax

good management tool (phpmyadmin)

easy to integrate and use with PHP, Ruby etc.

very common therefore lots of tutorials and howtos

CONS:

performance

bad or missing RDMS features (like postgreSQL or other systems have)

limited capacities storage-wise

datediff

Assuming you are using a User database and sessions, simply add a Session key. Auto generate this key as follows:

$newsession_key = SHA1( RAND(100000000,999999999));

Enter this in the database on the user row when logging in and store it in a session and in the database. Then on your code where you define the user logged in status you add something like:

$database_session = $DATABASE['sessionkey'];

If($database_session != $_SESSION['sessionkey']){

Unset($_SESSION['username'],$_SESSION['password'],$_SESSION['sessionkey']); #A*

}

A* Add in any sessions you use to keep the user logged in.

test

Some of the advantages of relational databases include the ability to link information about a particular person who is in several databases together by simple links. One disadvantage is that once the database is created it is not changed easily so any database forming as part of a relational database must be very carefully planed before anything else can be done

To solving such problem out you need to prof recovery software.

I would recommend you tool below finds out/opens/scans and repairs mysql troubles.

File system data management (or flat-file databases) served as the only method of file storage and retrieval before the advent of database management systems (such as relational databases). While retaining some use, flat-file databases suffer from poor accessibility, data redundancy, lack of standard file access and the inability to organize data.

Please refer to the related links section which points to the correct page of the on-line MYSQL manual.

There is a specific DATE variable type for collumns (as well as DATETIME, and TIME variable types). By default, entering a date in the format of yyyy-mm-dd (y being a digit of a year, m being a digit of a month, and d being a digit of a day) will suffice when storing dates. Most server-side languages take returned DATE's and turn them into strings - but in MySQL, they are not just strings.

No. A foreign key may only point to only one collumn on one other table, and a collumn may only have one foreign key reference assigned to it.

Data inconsistency exists when different and conflicting versions of the

same data appear in different places. Data inconsistency creates

unreliable information, because it will be difficult to determine which

version of the information is correct. (It's difficult to make correct - and

timely - decisions if those decisions are based on conflicting information.)

Data inconsistency is likely to occur when there is data redundancy. Data

redundancy occurs when the data file/database file contains redundant -

unnecessarily duplicated - data. That's why one major goal of good

database design is to eliminate data redundancy.

The MySQL logo is made up of the world MySQL and it has a dolphin jumping upwards on the right side.

The latest version in SAS is 9.1.3.

I'm just going to assume that "left" and "right" are names of an input fields, and that the form type is "POST"

in the php file that your form is posted to, you can get these values like this:

$left = $_POST["left"];

$right = $_POST["right"];

now $left and $right will have the values from your form, and you can use them as you like.

In databases, a view is a stored query accessible much the same way as a table.

The view does not hold any data, but can be used to retrieve data from one or more tables.

Views can represent a subset of the data contained in a table, can join and simplify multiple tables into a single virtual table, can aggregate table data (using sum, avg, count, etc) and can hide the complexity of data

SQL stands for Structured Query Language, and is a computer language designed for writing data manipulation or data management statements against a relational database. PL/SQL stands for Procedural Language/Structured Query Language which is Oracle's proprietary procedural extensions to the SQL language.

PRMS Product History 1969 Pansophic Systems was founded 1976 Computer Associates International. and PCR was founded 1980 PCR releases RMS (Resource Management System) 1987Pansophic Systems acquires PCR 1989 Pansophic releases PRMS 8.0 (Pansophic Resource Management System) 1991 CA acquires Pansophic Systems & PRMS 8.2 is released 1993 PRMS 8.3 is released 1995 PRMS 8.4 is released 1996 CA creates independent Business Unit - Acacia Technologies Acacia releases QRE Release 1.0 1997 Acacia releases QRE 2.0 - Advance Planning & Scheduling Tool Acacia acquires Systems Start-Up (Professional Services) 4/1999 Acacia releases PRMS 9.0 5/1999 Computer Associates creates interBiz Supply Chain Group (SCG) to focus on platform independent, e-commerce solutions for manufacturers and distributors. 6/1999 interBiz SCG releases QRE 2.1 7/1999 interBiz SCG releases ProAction, interBiz WebTrade & Advanced Financials Option Tony Lopez

The Oracle link, below, gives an objective comparison between MySQL and Oracle (n.b., a great deal of the lengthy page contains computer terminology that the average layman may not understand). what is the difference between oracle and MySQL?

Yes, a Database Management System's main advantage is that it will enforce relationships between tables in a database preventing you from entering data in one field in another table that does not already exist in another table. So for example if you have a database that tracks online purchase, the DBMS would prevent a product that does not already exist in the Products table from being added to a shopping cart table. Or an employee ID from being added to a timecard table that does not already exist in the employee table. Databases can be setup without enforced relationships, but doing so usually results in orphaned records (for instance, where and employee id exists in the timecard table that does not exist in the employee table.)