Searching for and Accessing PowerPoint Presentation, PPT - DocSlides

Searching  for and Accessing PowerPoint Presentation, PPT - DocSlides

2018-11-04 2K 2 0 0

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Information. Database. A database is a collection of data arranged for ease and speed of search and retrieval (The American Heritage Dictionary of English Language, 2000). . The . quality of being "... arranged for ease and speed of search and retrieval" is what distinguishes a database from a com.... ID: 713201

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Presentations text content in Searching for and Accessing

Slide1

Searching for and Accessing Information

Slide2

Database

A database is a collection of data arranged for ease and speed of search and retrieval (The American Heritage Dictionary of English Language, 2000).

The

quality of being "... arranged for ease and speed of search and retrieval" is what distinguishes a database from a computer network.

Slide3

Database

Although databases can be accessed through the Internet, their contents are not retrieved by search engine services (such as Google or Yahoo!).

Some

databases are available on CD-ROM and networked in some institutions through a subscription

Slide4

Database

Every database contains certain types and amounts of information referred to as

coverage

Slide5

Elements of database coverage

What kinds of

documents

? (journals, magazines, book chapters, dissertations, audio files, statistical tables, images, web pages, software applications?)

Which

disciplines

? (sociology, chemistry, music, all

, none

?)

What

time

[periods]? (the current year? 1950-1990? how often is the database updated? hourly? daily? weekly? monthly? annually?)

What

languages

? (English only? other languages?)

Which

publication

types? (scholarly? popular? trade? all? other?)

What is included in the

record

? (a whole chapter? article? brief description such as bibliographic citation? abstract?) publisher and title?)

Slide6

Other characteristics of a database

A database is any organized collection of data.

A

database

is as an electronic filing system for accessing data.

Traditional

databases

are organized by

fields

,

records

, and

files

.

Databases store information in tables; tables store records; each record has fields

Slide7

A

field

is a single piece of information about an object;

If

the object were an Employee, a field would be

Firstname

,

Lastname

, or

Date of birth.

Slide8

A

record

is one complete set of

fields

;

In an Employee file, there would be one record for John Smith, another record for Mary

Brown,

and another record for

Sue Black

A

file

is a collection of related

records

.

Slide9

What is a database

Some

examples of databases you may encounter in your daily life are:

a telephone book

T.V. Guide

airline reservation system

motor vehicle registration records

papers in

a filing

cabinet

files on your computer hard drive. 

Slide10

Understanding searches

Databases store data or information in

tables

, just like the one below:

Slide11

Understanding searches

The table allows you to see all the

records

stored in the database

Tables can store many records

Slide12

A record

is all of the data or information about a thing (or a person). Each bit of information is a

field

.

Slide13

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Slide16

Activity

Create a record with fields for a driver’s licence.

Slide17

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Slide19

Field Searching

Most searches

(e.g. using a search engine, databases)

search for “words anywhere” or “keywords” automatically

This type of search retrieves

more information

with

less precision

This is known as “

recall

” searching (it focuses on recalling as much information as possible)

Slide20

Fortunately, these retrieval systems allow searching in specific

fields

(e.g. author, title) and usually refer to this as “advanced” or “

expert

” searching

This kind of searching typically retrieves ...

Slide21

... less

information

with

more precision

(referred to as precision searching)

Slide22

Think about it

If you are a detective and the only clues you have for a missing persons case are the words "red," "blue," and "green

,“. Who is the missing person? What kind of search?

Slide23

Think about it

This

is

keyword

searching

Slide24

Think about it

If you

knew your person had a

red tie, blue shirt, and a green beret,

who would be the missing person? What kind of search?

Slide25

Think about it

This is

field

searching

What are the fields?

Slide26

QUICK REVIEW

Slide27

There are basic search techniques that are used when searching for information whether using the library resources, databases or the Internet.

You would have encountered four pieces of information that are needed when you did the catalogue tutorial.  These are

author, title, subject

and

keyword

.

Slide28

Search by author

An

author

search is used to locate works by the author. 

The more information about the author you provide, the more limited your search results will be.

Slide29

Title search

What is a title search?

Slide30

Title search

A

title

search is used to locate specific titles of books, references, periodicals and other resources.

Slide31

Subject search

A

subject

search is used to find materials on a specific topic

Slide32

Keyword search

Keyword

search is used when the author or title is unknown.  This is different from the subject search. 

A keyword search looks for specific keywords in all fields whereas the subject search is limited to a specific subject heading.

Slide33

Recall vs Precision

and

Keyword vs Field

When you want to find large amounts of information; general information about a topic, how would you search?

When you want to find small number of sources on a specific topic e.g. for course assignments

etc

, how would you search?

Slide34

NEW INFORMATION

Slide35

Search query

Most databases don't understand the natural language we speak and need help understanding what

we are

looking for.

This requires

a special set of

conventions

Slide36

Conventions

Description

Quotation marks

Around

exact

phrases (e.g. "university of washington")

Logical or Boolean operators

Connecting words that narrow or broaden a search to include only what you need. Examples:

OR, AND, NOT

Wildcards and truncation symbols

(* # ? !)

For terms that have variant forms of spelling or different possible endings.Examples:

child*

for child, children, childhood, childish, etc.

Nesting

Placing terms in parentheses to indicate separate units. (Like an equation, (A or B) not C

:

Slide37

Let’s stop here

Slide38

Boolean Operators

When searching for information,

boolean

operators

can be used to widen or narrow the search.

Slide39

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