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15 Cards in this Set
- Front
- Back
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Database
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Databases are designed to offer an organized mechanism for storing, managing and retrieving information.
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What is a table(Data Base)?
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A single store of related information. A table consists of records, and each record is made up of a number of fields
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Key field
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The records are sorted alphabetically by the name field
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Record (Database)
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Each record is made up of a number of fields. A record contains all the information about a single 'member' of a table.
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What is a field?
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Fields describe a single aspect of each member of a table.
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Primary Key
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It will uniquely identify each record. It may or may not provide information about the record it identifies
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Data Type
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This helps check for the wrong type of data being entered and makes sure the data is stored as efficiently as possible. It also means it will be sorted correctly.
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Alphanumeric/text fields
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A field of this data type will accept text, numbers and symbols
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Numeric fields
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A field of this data type is used to store numbers. Number fields are used to store numbers because the data will be sorted correctly
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Two types of numeric field
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Real - used for decimal numbers &
Integer - used for whole numbers |
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Logical/Boolean fields
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A field of this data type will only let you enter a 'Yes' or a 'No
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Date/Time (Fields)
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A field of this type stores days, months and years and Time.
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Types of data base
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Flat Model, Hierarchical Model, Relational Model and Network Model
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Analogue data
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It is represented in a continuous form, as contrasted with digital data having discrete values.
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Digital data
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A digital signal is a physical signal that is a representation of a sequence of discrete values
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