MICROSOFT ACCESS Pn. Jamilah Binti Yusof. DEFINITION A database is the computer equivalent of an...
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Transcript of MICROSOFT ACCESS Pn. Jamilah Binti Yusof. DEFINITION A database is the computer equivalent of an...
MICROSOFT ACCESS
Pn. Jamilah Binti Yusof
DEFINITION
A database is the computer equivalent of anorganized list of information. Typically, this information has a common subject or purpose, such as the list of employees, phonebook guide or a classmates address book.
Microsoft Access 2003 (Access 2003) is a database system management (database programs). It can store, manage, manipulate, analyze, retrieve, display or publish information from database
USAGE OF DATABASE
Easy to search data
Manage information in database
Save space
Easy to make maintenance
DATABASE APPLICATION
Computerized library systems
Automated teller machines
Flight reservation systems
Computerized parts inventory systems
3 TYPES POPULAR DBMS
Microsoft Access 2003
Corel Paradox
Lotus Approach
MySQL
There are 4 important objects as stated in the table below:
Objects Bar Function
Table
A collection of records that identify a category of data, such as Customers, Orders, or Inventory. Data inside a table is arrange by column name field and row named Record. Field – A single characteristic or attribute of a
person, place, object, event, or idea. Record – A set of related field values.
FormUse to enter new information, to edit or remove existing information or to locate information.
Query
Used to locate information, to view, change or analyze it in various ways. A select query retrieves data from one or more tables and displays the result in datasheet. A select query can be used to group record and calculate sums, counts, averages and other types of totals.
ReportTypically used to summarize, organize and analyze information in order to express a particular point of view to specific audience.
There are 10 types of data as stated in the table below:
Types Data Function
Text
You may type in any alphabetical/numerical data that you desire-up to a maximum of 255 characters. As indicated, this is a text field, so you can't do mathematical calculations. Examples of Text data are: names, addresses, stock numbers, room numbers, zip codes, etc
Memo
This field is for lots of text. You can have up to 32,000 characters.
Number
This field is for numbers where you want to add, subtract,
multiply, divide, average, and do numerical calculations.
This field can be a very large size, so when we get to
Field Properties, we'll talk about "sizing" this field so it
doesn't take up too much "space" in storage.
Date/Time
Dates and Times. You may format this later, as you may
desire.
Currency
Dollar ($). You may format this later, as you may desire. For example Ringgit Malaysia (RM)
AutoNumber
This field is an "automatic" counter that assigns a number
each time you put data into a new field.
Yes/No
This is a "True/False" or "Yes/No, 0/1” type of field.
OLE Object
This means "Object Link Embedding" which indicates you
can insert a graphic, picture, sound, etc. Pretty neat to put a photograph in a personnel record or a picture of an inventory item in the stock record (advanced stuff).
Hyperlink
A hyperlink is a pointer from one object to another. The destination is frequently another Web page, but it can also be a picture, an e-mail address, a file (such as a multimedia file or Microsoft Office document), or a program. The hyperlink itself can be displayed as text or as a picture.
Lookup Wizard
This wizard creates a lookup column, which displays a list of values you can choose from.
ADVANTAGES OF DBMS
Controlling Redundancy
Integrity can be enforced
Inconsistency can be avoided
Data can be sharedStandards can be enforced
Restricting unauthorized access
Solving Enterprise Requirement than Individual Requirement
Providing Backup and Recovery
Cost of developing and maintaining system is lower
Data Model can be developed
DISADVANTAGES OF DBMS
Complexity
Size
Performance
Higher impact of a failure
Cost of DBMS
Additional Hardware costs
Cost of Conversion
PRIMARY KEY means the value in the primary key fields is need to uniquely identify each record; that’s no record can have the same value in this field.