Chapter 6.1 - Developing Business Systems with Databases-1

Chapter 6.1 - Developing Business Systems with Databases-1...

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Chapter 6
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Volume of data is increasing exponentially. New data created in 2006 was ~ 161 Exabytes  1 Exabyte ~ 1.07 billion gigabytes Data is created and collected by many  individuals using various methods and devices. Data come from many sources including internal  sources, personal sources and external sources. Data security, quality and integrity are critical. An ever-increasing amount of data needs to be  considered in making organizational decisions.
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Analog vs. digital signals Digital computers make use of the Binary  number system to represent data Each Binary Digit (BIT) has two states  On or Off Combinations of ones and zeroes represent  characters 8 bits = 1 byte  1 byte ~ 1 character 2 8  = 256 combinations of letters and numbers
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What are the Binary Equivalents  of the following Decimal  Numbers? Decimal Binary 5 1000s 100s 10s 1s 32s 16s 8s 4s 2s 1s 0 1 2 4 0 0 0 1 1 1 0 0 0 0 You can use an Excel function =DEC2BIN()  to convert decimal to binary numbers
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Principle Coding Schemes   Sending a  character from the keyboard to the computer 1. ASCII  2. EBCDIC 3. Unicode Sufficient for English and  Western European languages Unicode often  used for others
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Bit  (a binary digit): a switch that is either on or off.
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