Database Design

Sometimes, a particular field in a database row has a value that is either unknown or undefined. An example might be the termination date of an employee who is still employed by the company. A date field would not accept any value that was not a valid date but no date has been determined for the field as yet. A null would indicate that.

business rules

In-House development means that a company has programmers on its staff and develops software internally. Outsourced development is when a company hires a firm to develop a custom applicaation Packaged software is what you purchase when you goto a store and purchase software off-the-shelf.

MS-DOS is an operating system designed for the IBM PC by Microsoft in 1981. MS DOS is Microsoft Disk Operating System. It was a command-line interface, meaning the user had to type in commands to use it, unlike Windows which is a Graphical User Interface. MS DOS was released on IBM PCs when they came out in the 1980s and continued in popular use until the mid 1990s, by which time the first of the Windows operating systems, Windows 95, began to take over.

MS DOS commands were either stored as individual programs, known as external commands, or in a file called Command.com, which stored more commonly used commands. These were called internal commands. Included in these would have been commands like COPY, DEL, DIR, CD and RD.

COPY enabled the copying of files.

DEL deleted files.

DIR gave a listing of files in a directory (now called a folder).

CD changed from one directory to another.

RD removed a directory.

You would need at the very least 3 tables.

1. TblCompany

Assign them a unique ID.

Ticker (Symbol)

CompanyName

Industry

Sector

2. tblDate

OpenedStockDays

...

...

3. TransactionTable

Ticker

OpenedStockDays

Open

High

Low

Close

Volume

make sure to link them properly and to always set a primary key for each table.

Shunt reactor are generally employed at the end of long transmission line. During charging of line due to ferranti effect receiving end voltage increases dangerously to control this shunt reactors are used.

No, according to this webpage:

http://safeweb.norton.com/report/show?url=hardsextube.com

It is a general piece of software that anyone could use, such as a word processor or spreadsheet etc. You can go into a shop and buy it. The developers would make lots of copies and sell it as all sorts of people would want it. You also have specialist software which may be written for a specific group of people or a specific company or individual and which would be no use to anyone else. Only one or a few copies might be made as it is for a very specific client.

No. A database can be manual, like a phone book or a shopping list. For it to be a database it needs to be structured or organised. If you take a phone book, although there are thousands of names in it, you can usually find a phone number you are looking for very quickly. This is because the phone book is structured and organised. So it does not have to be on a computer to be a database. A manual database can be computerised. The data would be entered into a computer.

File management is the utility that keeps track of where your documents, spreadsheets, and presentation are located. It also displays other files that are on your computer like pictures.

Data integrity = making sure the data is correct and not corrupt

Data security = making sure only the people who should have access to the data are the only ones who can access the data. also, keeping straight who can read the data and who can write data.

digrams for public transportation

Its not this website its either your computer or a virus.

First of all u must khow for what u want to create DBMS. you must create Mini world and select some entities and distinguish their attributes. For khowing more about entities,attributes and their relations i suggest u read this book: Fundamental of database system written by: Ramez Elmasri & shamkant B. Navathe

A protocol is a set of rules describing some behavior. In order to communicate in a common manner, the sender and receiver have to agree on the "language" of communication.

A protocol states what those rules are, and because they are a standard, everyone agrees and knows what to expect.

A database is a collection of tables that is used for some purpose (typically an application of some sort). A database model is a description of that database, and describes how the tables relate to each other. Typically, a model is designed first, then the actual database is implemented using the model as a blueprint.

A database is simply a collection of pieces of information (data). A text file storing names and phone numbers is a database. A database management system (DBMS) is some software that manages the data within the database such as MySQL. Both the software and the database are considered together when thinking of a DBMS.

If you wanted to look up an article from the Chicago Tribune the best place to start would be

In an inventory database, for example, a purchasing query could be done for all merchandise at or near the inventory minimum of the particular item.

0 + 0 = 0

0 000 0000

1 + 1 = 2

1 001 0010

2 + 2 = 4

2 010 0100

3 + 3 = 6

3 011 0110

4 + 4 = 8

4 100 1000

5 + 5 = 10

5 101 1010

6 + 6 = 12

6 110 1100

7 + 7 = 14

7 111 1110

Table, index, trigger and column Table, index, trigger and column

Record is more a term related to databases than to spreadsheets. However, as you can do some database work using a spreadsheet, then it can be a term used in a spreadsheet. A record in a database is a row of related data, such as the name, age, address and phone number of a person. If it is done in a spreadsheet, with each set of data on a separate row, it can be regarded as being a record.

A text field can contain both numbers and text, so that is what you would use.