DBMS-1 - DataandInformation How are data and information...

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Data and Information How are data and information related? p. 516 Fig. 10-1 Next processing data stored on disk Step 1. The member data, including a photograph, is entered and stored on the hard disk. Step 2. The computer extracts the member data from disk. Step 3. The receipt is created and printed. Data is raw facts Information is data that is organized and meaningful receipt Computers process data into information
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Add, change, and delete data Create database Create database Sort and retrieve data Create forms and reports Data and Information What is a database ? p. 517 Next Database software allows you to Database software allows you to Collection of data organized so you can access, retrieve, and use it Database software also called database management system (DBMS) Click to view animation
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Data and Information What is data integrity? p. 517 Next Degree to which data is correct Garbage in, garbage out (GIGO) —computer phrase that means you cannot create correct information from incorrect data Garbage out Garbage in Data integrity is lost
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Useful Useful Accessible Accessible Organized Organized Data and Information What are the qualities of valuable information? p. 518 Next Timely Timely Verifiable Verifiable Accurate Cost-effective
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The Hierarchy of Data What is a hierarchy? p. 519 Fig. 10-2 Next Database contains files, file contains records, record contains fields, field contains characters
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The Hierarchy of Data What is a field ? p. 519 Fig. 10-3 Next Combination of one or more characters Smallest unit of data user accesses Field size defines the maximum number of characters a field can contain Field name uniquely identifies each field Data type specifies kind of data field contains
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Yes/No Yes/No (also called Boolean )— only the values Yes or No (or True or False) Hyperlink Hyperlink Web address that links to document or Web page Object (also called BLOB for binary large object)—photograph, audio, video, or document created in other application such as word processing or spreadsheet The Hierarchy of Data What are common data types? p. 520 Next Currency Currency dollar and cent amounts or numbers containing decimal values Date Date month, day, year, and sometimes time Memo Memo lengthy text entries Text Text (also called alphanumeric ) —letters, numbers, or special characters Numeric Numeric numbers only AutoNumber AutoNumber unique number automatically assigned to each new record
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The Hierarchy of Data What is a record ? p. 520 Next Group of related fields Key field , or primary key , uniquely identifies each record
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The Hierarchy of Data What is a data file ?
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This note was uploaded on 10/22/2011 for the course ECONOMICS 105 taught by Professor Ak during the Spring '11 term at Punjab Engineering College.

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DBMS-1 - DataandInformation How are data and information...

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