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MS Access and Database
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MS Access and Database
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Index
� Introduction to MS Access and Database
� Hierarchy used in Access
� Opening/Creating an Existing Database
� Creating Tables in Database
� Defining Relationships
� Creation of report
� Creating a Form
� Difference between File processing & DBMS� Characteristics of DBMS
� Types of end users
� Advantages of using DBMS
� Data Models & Schemas
� Categories of Data Models
� Definition of entity, attribute and relation
� DBMS architecture
� Data independence
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MS Access and Database
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Introduction
Access is a database program that enables one can store information such
as a client list, products, invoices, inventory, events, and other collections of data.
In addition to entering the data in a database table, you have several tools for working
with the data. Forms for simpler data entry can be created. You can create a query to
display a set of record. All these elements are Access objects and are stored together in the database.
Microsoft Access is a powerful program to create and manage your databases.
In Access terms, a database is a collection of all the tables, queries, forms,
data access pages, reports, macros, and modules that compose a complete system.
Relational refers to the fact that the tables that comprise the database relateto one another.
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Hierarchy that Microsoft Access uses in breaking down a database
� Database File
This is your main file that encompasses the entire database and that is saved to your hard-drive or floppydisk.
Example StudentDatabase.mdb
� Table
A table is a collection of data about a specific topic. There can be multiple tables in a database.
Example #1) Students
Example #2) Teachers
� Field
Fields are the different categories within a Table. Tables usually contain multiple fields.
Example #1) Student LastNameExample #2) Student FirstName
� Datatypes
Datatypes are the properties of each field. A field only has 1 datatype.
Database File
Table
Field
Datatype
Value
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MS Access and Database
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Opening/Creating an Existing Database
� After starting Access, create a new database or open an existing database.A database is stored as a file on your computer or on a network computer.
To work with the objects in a database, one must open the database file.To open an existing database , follow these steps:
When Microsoft Access first starts up, a dialog box is automatically displayed with options to create a new
database or open an existing one. If this dialog box is displayed, click Access Database Wizards, pages, and
projects and then click OK.
On the Databases tab, double-click the icon for the kind of database you want to create.
Specify a name and location for the database.
Click Create to start defining your new database
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Creating Tables in Database
A table is a collection of data about a specific topic, such as students or contacts. Using a separate table for
each topic means that you store that data only once, which makes your database more efficient, and reduces
data-entry errors. Tables organize data into columns (called fields) and rows (called records).
� Primary Key
One or more fields (columns) whose value or values uniquely identify each record in a table. A primary key
does not allow Null values and must always have a unique value. A primary key is used to relate a table to
foreign keys in other tables.
For Example., make the Soc Sec # field the primary key, meaning that every student has a social securitynumber and no 2 are the same. To do this, simply select the Soc Sec # field and select the primary key
button
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MS Access and Database
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Defining Relationships
After setting up multiple tables in your Microsoft Access database, we need a way of telling Access how to
bring that information back together again. The first step in this process is to define relationships between
your tables. After this, one can create queries, forms, and reports to display information from several tables at
once.
A relationship works by matching data in key fields - usually a field with the same name in both tables. In
most cases, these matching fields are the primary key from one table, which provides a unique identifier for
each record, and a foreign key in the other table. For example, teachers can be associated with the students
they're responsible for by creating a relationship between the teacher's table and the student's table using the
Teacher ID fields.
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Steps for defining references
In the database window view, at the top, click on Tools ---> Relationships
Select the Tables you want to link together, by clicking on them and selecting the Add Button
Drag the primary key of the Parent table (Teacher in this case), and drop it into the same field in the Child
table (Student in this case)
Select Enforce Referential Integrity
When the Cascade Update Related Fields check box is set, changing a primary key value in the primary
table automatically updates the matching value in all related records.
When the Cascade Delete Related Records check box is set, deleting a record in the primary table deletes
any related records in the related table
Click Create and Save the Relationship
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Creating a Form
� It is a good idea to create a form using the wizard, unless you are an advanced user andknow what you are doing. Microsoft Access does a very good job of creating a form using
the wizard. The following steps are needed to create a basic form:
Switch to the Database W indow. You can do this by pressing F11 on the keyboard.
Click on the Forms button under Objects on the left side of screen
Double click on Create Form Using Wizard
On the next screen select the fields you want to view on your form.Click Next
Select the layout you wish
Click Next
Select the style you desire. Click Next
Give you form a name, and select Open the Form and enter information
Select Finish
You should see your form. To adjust the design of your form, simply hit the design button (same as with the
tables), and adjust your form accordingly
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Creating a Report
� A report is an effective way to present your data in a printed format. Because you havecontrol over the size and appearance of everything on a report, you can display the
information the way you want to see it. If forms are for input, then reports are for output.Anything you plan to print deserves a report, whether it is a list of names and addresses, a
financial summary for a period, or a set of mailing labels. Again the Access Wizards walk
you through the process of defining reports.
Switch to the Database W indow. You can do this by pressing F11 on the keyboard.
Click on the Reports button under Objects on the left side of screen
Double click on Create Report Using Wizard
On the next screen select the fields you want to view on your form. Most of the time you would select all of them.
Click Next
Select if you would like to group your files. Keep repeating this step for as many groupings as you would like.
Click Next
Select the layout and the paper orientation you desire. Click Next
Select the style you desire..Click Next
Give you report a name, and select Preview the Report
Select Finish
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Difference between File processing & DBMS
A number of characteristics distinguish the database approach from the traditional approach of programming
with files. In traditional file processing, each user defines and implements the files needed for a specific
application as part of programming the application. For example, one user, the grade reporting office, may
keep a file on students and their grades. Programs to print a student¶s transcript and to enter new grades into
the file are implemented. A second user, the accounting office, may keep track of students¶ fees and their payments. Although both users are interested in data about students, each user maintains separate files²
and programs to manipulate these files²because each requires some data not available from the other
user¶s files. This redundancy in defining and storing data results in wasted storage space and in redundant
efforts to maintain common data up-to-date. In the database approach, a single repository of data is
maintained that is defined once and then is accessed by various users. The main characteristics of the
database approach versus the file-processing approach are the following.
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Characteristics of DBMS
� Self-Describing Nature of a Database System-
A fundamental characteristic of the database approach is that the database system contains not only thedatabase itself but also a complete definition or description of the database structure and constraints. This
definition is stored in the system catalog, which contains information such as the structure of each file, the
type and storage format of each data item, and various constraints on the data. The information stored in thecatalog is called meta-data, and it describes the structure of the primary database. The catalog is used by the
DBMS software and also by database users who need information about the database structure. A general
purpose DBMS software package is not written for a specific database application, and hence it must refer to
the catalog to know the structure of the files in a specific database, such as the type and format of data it will
access. The DBMS software must work equally well with any number of database applications²for example,
a university database, a banking database, or a company database²as long as the database definition isstored in the catalog.
� Insulation between Programs & Data and Data Abstraction
In traditional file processing, the structure of data files is embedded in the access programs, so any changes
to the structure of a file may require changing all programs that access this file. By contrast, DBMS access
programs do not require such changes in most cases. The structure of data files is stored in the DBMS
catalog separately from the access programs. We call this property program-data independence. In object-oriented and object-relational databases, users can define operations on data as part of the database
definitions. An operation (also called a function) is specified in two parts. The interface (or signature) of an
operation includes the operation name and the data types of its arguments. The implementation (or method)of the operation is specified separately and can be changed without affecting the interface. User application
programs can operate on the data by invoking these operations through their names and arguments,
regardless of how the operations are implemented. This may be termed program-operation independence.
The characteristic that allows program-data independence and program-operation independence is calleddata abstraction.
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Characteristics of DBMS
� Support of Multiple Views of the Data
A database typically has many users, each of whom may require a different perspective or view of thedatabase. A view may be a subset of the database or it may contain virtual data that is derived from the
database files but is not explicitly stored. Some users may not need to be aware of whether the data they
refer to is stored or derived. A multi-user DBMS whose users have a variety of applications must providefacilities for defining multiple views.
� Sharing of Data and Multi user Transaction Processing
A multi user DBMS, as its name implies, must allow multiple users to access the database at the same time.
This is essential if data for multiple applications is to be integrated and maintained in a single database.
TheDBMS must include concurrency control software to ensure that several users trying to update the same data
do so in a controlled manner so that the result of the updates is correct. For example, when several
reservation clerks try to assign a seat on an airline flight, the DBMS should ensure that each seat can be
accessed by only one clerk at a time for assignment to a passenger. These types of applications are
generally called on-line transaction processing (OLTP) applications.
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Types of end users
� End users are the people whose jobs require access to the database for querying,updating, and generating reports; the database primarily exists for their use.
There are several categories of end users:
Casual end users - occasionally access the database, but they may need different information each time.
They use a sophisticated database query language to specify their requests and are typically middle- or high-
level managers or other occasional browsers.
Naive or parametric end users make up a sizable portion of database end users. Their main job function
revolves around constantly querying and updating the database, using standard types of queries andupdates²called canned transactions²that have been carefully programmed and tested. The tasks that such
users perform are varied:
Bank tellers check account balances and post withdrawals and deposits.
Reservation clerks for airlines, hotels, and car rental companies check availability for a given
request and make reservations.
Sophisticated end users - include engineers, sc ientists, business analysts, and others who thoroughly
familiarize themselves with the facilities of the DBMS so as to implement their applications to meet their complex requirements.
Stand-alone users - maintain personal databases by using ready-made program packages that provide
easy-to-use menu- or graphics-based interfaces. An example is the user of a tax package that stores avariety of personal financial data for tax purposes.
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Advantages of using DBMS
� Controlling Redundancy
In traditional software development utilizing file processing, every user group maintains its own files for handling its data-processing applications. For example, consider the UNIVERSITY database; here, two
groups of users might be the course registration personnel and the accounting office. In the traditional
approach, each group independently keeps files on students. The accounting office also keeps data onregistration and related billing information, whereas the registration office keeps track of student courses and
grades. Much of the data is stored twice: once in the files of each user group. Additional user groups may
further duplicate some or all of the same data in their own files. This redundancy in storing the same data
multiple times leads to several problems. First, there is the need to perform a single logical update²such as
entering data on a new student²multiple times: once for each file where student data is recorded. This leads
to duplication of effort. Second, storage space is wasted when the same data is stored repeatedly, and thisproblem may be serious for large databases. Third, files that represent the same data may become
inconsistent. This may happen because an update is applied to some of the files but not to others.
� Restricting Unauthorized Access-
When multiple users share a database, it is likely that some users will not be authorized to access all
information in the database. For example, financial data is often considered confidential, and hence onlyauthorized persons are allowed to access such data. In addition, some users may be permitted only to
retrieve data, whereas others are allowed both to retrieve and to update. Hence, the type of access
operation²retrieval or update²must also be controlled. Typically, users or user groups are given accountnumbers protected by passwords, which they can use to gain access to the database. A DBMS should
provide a security and authorization subsystem, which the DBA uses to create accounts and to specify
account restrictions. The DBMS should then enforce these restrictions automatically. Notice that we can
apply similar controls to the DBMS software.
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Data Models & Schemas
One fundamental characteristic of the database approach is that it provides some level of data abstraction by
hiding details of data storage that are not needed by most database users. A data model is a collection of
concepts that can be used to describe the structure of a database and provides the necessary means to
achieve this abstraction. By structure of a database we mean the data types, relationships, and constraints
that should hold on the data. Most data models also include a set of basic operations for specifying retrievalsand updates on the database. In addition to the basic operations provided by the data model, it is becoming
more common to include concepts in the data model to specify the dynamic aspect or behavior of a database
application. This allows the database designer to specify a set of valid user-defined operations that are
allowed on the database objects.
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Categories of Data Models
� Many data models have been proposed, and we can categorize them according to thetypes of concepts they use to describe the database structure.
High-level or conceptual data models- provide concepts that are close to the way many users perceive data.
Low-level or physical data models- provide concepts that describe the details of how data is stored in the
computer.
� Concepts provided by low-level data models are generally meant for computer specialists,
not for typical end users. Between these two extremes is a class of representational (or
implementation) data models, which provide concepts that may be understood by endusers but that are not too far removed from the way data is organized within the computer.Representational data models hide some details of data storage but can be implemented
on a computer system in a direct way.
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Definition of entity, attribute and relation
An entity represents a real-world object or concept, such as an employee or a project, that is described in
the database.
An attribute represents some property of interest that further describes an entity, such as the employee¶sname or salary.
A relationship among two or more entities represents an interaction among the entities; for example, a
works-on relationship between an employee and a project
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DBMS Architecture
� Three important characteristics of the database approach, are
Insulation of programs and data (program-data and program-operation independence);
Support of multiple user views; and
Use of a catalog to store the database description (schema). In this section we specify an architecture for
database systems, called the
� The three-schema architecture, which was proposed to help achieve and visualize these
characteristics.
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Levels of DBMS
� The Internal or Physical Level
The collection of files permanently stored on secondary storage devices is known as the physical database.
The physical or internal level is the one closest to physical storage, and it provides a low-level description of
the physical database, and an interface between the operating system's file system and the record structures
used in higher levels of abstraction. It is at this level that record types and methods of storage are defined, aswell as how stored fields are represented, what physical sequence the stored records are in, and what other
physical structures exist.
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Levels of DBMS
� The Conceptual Level
The conceptual level presents a logical view of the entire database as a unified whole, which allows you tobring all the data in the database together and see it in a consistent manner. The first stage in the design of a
database is to define the conceptual view, and a DBMS provides a data definition language for this purpose.
It is the conceptual level that allows a DBMS to provide data independence. The data definition languageused to create the conceptual level must not specify any physical storage considerations that should be
handled by the physical level. It should not provide any storage or access details, but should define the
information content only.
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Levels of DBMS
� The External or View Level
The external or view level provides a window on the conceptual view which allows the user to see only thedata of interest to them. The user can be either an application program or an end user. Any number of
external schema can be defined and they can overlap each other. Because they have responsibilities for the
design and maintenance for the design and maintenance of the database, they at times need to be able tosee the entire database. The external and the conceptual view are functionally equivalent for these two users.
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Data Independence
� The three-schema architecture can be used to explain the concept of data independence,which can be defined as the capacity to change the schema at one level of a database
system without having to change the schema at the next higher level. 2 types of dataindependence:
Logical data independence is the capacity to change the conceptual schema without having to change
external schemas or application programs. We may change the conceptual schema to expand the database,
or to reduce the database. In the latter case, external schemas that refer only to the remaining data should
not be affected. Only the view definition and the mappings need be changed in a DBMS that supports logicaldata independence. Application programs that reference the external schema constructs must work as
before, after the conceptual schema undergoes a logical reorganization. Changes to constraints can be
applied also to the conceptual schema without affecting the external schemas or application programs.
Physical data independence is the capacity to change the internal schema without having to change theconceptual (or external) schemas. Changes to the internal schema may be needed because some physical
files had to be reorganized²for example, by creating additional access structures²to improve the
performance of retrieval or update. If the same data as before remains in the database, we should not haveto change the conceptual schema. For example, providing an access path to improve retrieval of SEC TION
records by Semester and Year should not require a query such as "list all sections offered in fall 1998" to be
changed, although the query would be executed more efficiently by the DBMS by utilizing the new accesspath.
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Thank you
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