introduction to computers lesson 10b. home database a collection of related data or facts
TRANSCRIPT
Introduction to Computers
Lesson 10BLesson 10B
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Database
A collection of related data or facts
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Database Management System (DBMS)
A software tool that lets you store,
access and process data or facts into
useful information
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Important Database Terms
Fields
Records
Tables
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Two Kinds of Databases
Flat-file
Relational
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Flat-file Database
A database file that has a single data
table
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Relational Database
A database made up of a set of tables
A common field in two tables creates a
relationship between the tables
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Three Categories of Data Management
Entering data into the database
Sorting the data
Obtaining data subsets
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Data Management Interface Tools
Creating tables
Viewing records
Sorting records
Creating queries
Generating reports
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Steps for Creating Fields
Name the field
Specify the field type
Specify the field size
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Types of Fields
Text
Numeric
Date or time
Logical
Binary
Counter
Memo
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Form
Custom view of the table that shows
one record at a time
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Mask
Also known as picture or field format
Accepts only valid characters and
controls the entry’s display format
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Filter
Displays a selected list or subset of
records from a table
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Query
User instructions that describe data and
set criteria for the DBMS, which then
constructs information based on the
instructions
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Examples of Queries
Allow the DBMS to locate records
Establish relationships or links between tables to update records
List a subset of records
Perform calculations
Delete obsolete records
Perform other data management tasks
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Ways to Perform Queries
SQL
Xbase
QBE
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SQL
English-like query language that lets the
user query a database without knowing
much about the underlying database
structure
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Xbase
Generic query language derived from
the query/programming language used
in Ashton Tate’s Dbase family of
database products
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Query by Example (QBE)
Graphic query interface using a form or
a grid
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Report
Printed information that, like a query result, is assembled by gathering data based on user-supplied criteria
Report generators in most DBMSs create reports from queries
Lesson 10BLesson 10B
Database Management Database Management SystemsSystems
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Review Questions
What is a DBMS?
What are the two kinds of databases?
What is a form?
What is a query?