Computer Science : Data

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  • Created by: imetlo
  • Created on: 18-02-18 13:52
Binary
used to represent all data on a computer and represent program instrucitons. Includes numbers, text, sound, images, etc.
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Binary digits (bits)
the smallest unit of data that is represented in a computer, has a single binary value, either 1/0
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Overflow
when there isn't enough room for a result - produces an overflow error
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Integer
a whole number, can have positive/negative value
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Byte
basic combination of bits used to represent an item of information, usually consists of 8 bits
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MSB
most significant bit - leftmost and largest bit - is a minus number
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Binary shift
operation done on all the bits of a binary value - are moved by a specific number of places to right/left
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Arithmetic shift
used for signed binary numbers + allows you to multiply and divide negative two's complement numbers
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Hexadecimal
a base-16 number system - are 16 digits and place values increase in powers of 16
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Logical shift
used for unsigned binary numbers
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Character set
the defined list of characters recognised by a computers hardware and structure
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Encryption
process of encoding a message into a form that only the receiver can decode
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Pixel
short for 'picture element' - is smallest single point of colour in a graphic image
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Resolution
number of pixels per inch when image is displayed
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Colour depth
number of bits used to encode the colour of each pixel
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Sampling
taking measurements of sound wave at regular but distinct intervals of time
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Sampling rate
number of samples taken per second, measured in Hertz
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Bit depth
number of bits used to encode information from each sample
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Fidelity
correspondence between original sound and recording
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Compression
changing the format of a data file to make size smaller
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Lossless compression
compressing a file without losing any data
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Lossy compression
compression where some data is removed - original file cannot be restored after lossy file decompressed
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Database
an organised store of data
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Entity
something that is recognised as being capable of an independent existence - is uniquely identified and about which data is stored
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Attribute
an item of data stored about an entity
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Field
one piece of information
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Record
all the data or information about 1 item
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Primary Key
a unique identity for each record
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Table
stores all information about 1 particulat category
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Flat file database
database with a single table
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Relational database
database that consists of one more than one table
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File
all records in a table or a group of linked tables
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Data redundency
the same data entered more than once
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Data inconsistency
when same data entered more than once(redundancy) errors can occur
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Compound key
a key that consists of two or more fields used to identify a record uniquely
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Form
a user interface used to input data into a database
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Query
used to search a database
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Report
used to format and print out information from a database
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Other cards in this set

Card 2

Front

the smallest unit of data that is represented in a computer, has a single binary value, either 1/0

Back

Binary digits (bits)

Card 3

Front

when there isn't enough room for a result - produces an overflow error

Back

Preview of the back of card 3

Card 4

Front

a whole number, can have positive/negative value

Back

Preview of the back of card 4

Card 5

Front

basic combination of bits used to represent an item of information, usually consists of 8 bits

Back

Preview of the back of card 5
View more cards

Comments

Mr O Adeniyan

Report

Quite Good

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