Database Design

Business related problems:

Pamela Johnson eating EVERYTHING!

simply draw separate graph from the graph from which you have to find the subgraphs, remove exact one edge ont time and proceed to the till end.

use same approach

because its spoiled or because the electric current in your house is fluctuating

Yes you should create a schema for any IT project. A schema will provide a road map for the entire project.

indices r required 4 efficent acces 2 spatial data.traditional index structure sucha as hash indices nd b-trees ,r not suitable since they used 4 only 1-d data,whereas spatrial data r typically 2 or more dimensions.

Placid04

muzaffarpur,bihar,march 2012

Suppose Me and you are chatting over SMS.
Encryption is a transformation( Encoding the text message) of the original message sent by each one of us into such a form that no one getting the message in the middle can understand it.


Ex: i wil say "Hi"
the encrypted msg may be like "Gh" who can get it that it was "Hi" ?
Like that it is






Bye

a record is something that you hold data on one specific field consisting of more and you can have as much records you want

There are two primary variations of deductive database systems: expert database systems and knowledge-based database systems. Deductive databases differ from these two types of databases in one major respect: In the case of expert or knowledge-based databases, the data needs to be present in the primary memory of the computer. However, in a deductive database, this restriction is not present. The data can be in primary or secondary memory.

To quote my project supervisor:

The abstract is not the same as a summary in the sense you are think

of. It is a standalone account of the document giving

• purpose of the work (objectives)

• method used

• scope of the work

• results

• conclusions and recommendations

http://msdn.microsoft.com/en-us/library/aa165278(office.10).aspx

As the name suggest data provide is something that provides data. A data provider can be anything a source or a web resource. Example Google is a search engine that helps you get desired data .

An aggregate is a group made up of a collection of items. Aggregated data is data that has been summed or grouped - hopefully according to a logical pattern. We need aggregated data because a heap of unsorted data is useless. Thus if you had a database which collected names and addresses you would aggregate street names into one group, and family names into another (otherwise your scrambled data might lead you to believe Mr. Walnut lives on Smith Street).

You can manipulate aggregates to form other aggregates, for instance grouping all of your products made in Rome, Copenhagen and Paris into an aggregate of products manufactured in Europe. You can also enumerate the pieces within your aggregate so that you can make comparisons between them. Are the collective sales of the North American division larger or smaller than the European one (for instance)?

A multivalue attribute is the practice of maintaining more than a single value in a database column. Lets say for example you want to know the hobbies for a client. The proper way to handle this is to maintain the data in a one - to - many child table. Another way is a multivalue field. This in effect is a text field (varchar, etc) that will contain one or more values, separated by a comma (as an example).

This of course is NOT the way to go and will cause performance problems in parsing the information and make many reports and logical use of the data very difficult (but possible).

Unix was rewritten in the C programming language and not in assembly language. The migration from assembly language to the higher-level language C resulted in much more portable software, requiring only a relatively small amount of machine-dependent code to be replaced when porting Unix to other computing platforms.

Unix manages the hardware and the executing processes by the kernel. The kernel is a collection of programs written in C which directly communicate with the hardware. applications communicate to system using kernal. Hence kernal need to be changed for different hardware but user interface remains same.

Some examples are SQLServer , MySQL, Orcle

For Microsoft SQL Server there are no numeric values that consume 3 bytes. The numeric data types, their value range, and byte consumption as we follows:

Data type

Range

Storage

bigint

-2^63 (-9,223,372,036,854,775,808) to 2^63-1 (9,223,372,036,854,775,807)

8 Bytes

int

-2^31 (-2,147,483,648) to 2^31-1 (2,147,483,647)

4 Bytes

smallint

-2^15 (-32,768) to 2^15-1 (32,767)

2 Bytes

tinyint

0 to 255

1 Byte

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Structural constraints are set in place by a system or organization. This is based on rules that are to be followed as directed by the organization.

All access is relative to the local time zone of the server, so you simply record the local time. Knowing the server's time zone allows you determine how many hours behind or in front of UTC you are and knowing the user's time zone allows you to do the same for the user, thus you can calculate the time difference by subtracting one from the other.

For example, suppose the server is in Los Angeles, USA and the user is in Rome, Italy. Los Angeles is UTC -8 while Rome is UTC +1, so the time difference is 9 hours in total, such that Rome is 9 hours ahead of Los Angeles. So if a user accesses the server at 10:00 Los Angeles time, it would have been 19:00 in Rome.

As another example, suppose the server is in Helsinki, Finland (UTC +2), and the user is in Toronto, Canada (UTC -5). The time difference is 7 hours, such that Toronto is 7 hours behind Helsinki. So an access at 10:00 in Helsinki occurred at 03:00 in Toronto.

Computers would be useless lumps of plastic and metal without maths.

These are few of the many ways in which mathematical techniques are used:

Data storage requires binary arithmetic.

It can also require compression techniques.

Data processing uses logic circuits.

It also requires algorithms.

For this, you could use a smallint, if your data does not have fractional values. You could use a smallint even with fractional values up to two decimal places for the range below 300 pounds (just multiply by 100 before inserting the data, and divide by 100 when you retrieve it.

If your data may change ranges later on, or might include something other than pure numbers, you may consider using a varchar or text type for databases, or the String type in code.

Cancels the noise.

No, you will need the individual tracks of the recording from the artist in order to bleep the words out without affecting the rest of the instruments.