lecture 9 application software 4. microsoft access

Week 10 (2012) Dr. Ghada Drahem

INTENDED LEARNING OUTCOMESThis lecture covers:

Describe what Microsoft Access. When and how this program might be used

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MICROSOFT ACCESSDatabases contain a variety of objects

(such as tables, queries, forms, reports)

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CREATING A DATABASEDatabase file is created firstTables can then be createdTypically, the table structure is specified

first Includes a list of fields and their properties,

including: Field name (unique identifying name) Data type (text, number, date, object) Field size (maximum number of characters) Default value (initial content of the field)

The table is named and savedThe table structure can be modified using

the Design view

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CREATING AN INITIAL TABLE

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CREATING A DATABASE (cont.)After the table structure has been created,

data is entered into the tableDatasheet view: Lists all data and looks

similar to a spreadsheetForm: Created by the user and typically

displays just one record at a timeIn either case, data is entered into the

database tableEither Datasheet view or a form can be

used to modify data or delete records

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QUERIESQuery: A question; a request for specific

information from the databaseContain criteria to specify the records and

fields to be included in the query resultsAre named and saved so they can be run again

at a later timeResults always include the current database

dataSQL (Structured Query Language) is a

comprehensive database language; it has statements for data definition, query, and update. In addition it has facilities for defining views on the database,

SQL (STRUCTURED QUERY LANGUAGE)

SQL is a comprehensive database language

It has statements for data definition, query, and update.

In addition it has facilities for defining views on the database, for specifying security and authorization, for defining integrity constraints, and for specifying transaction controls.

It has rules for embedding SQL statements into a general-purpose programming language such as C.

BASIC QUERIES IN SQLSQL has one basic statement for retrieving

information from a database; the SELECT statementThe basic form of the SELECT statement

SELECT <attribute list>FROM <table list>WHERE <condition>

Example: retrieve the birthdate and address of the employee(s) whose name is ‘John B. Smith’

SELECT BDATE, ADDRESSFROM ENPLOYEEWHERE FNAME= ‘John’ AND MNAME=’B’ AND

LNAME= ‘Smith’

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REPORTSReports: Created when a more formal output

is desiredAssociated with either a table or a queryData is displayed in the specified format

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DATABASES AND THE WEB

Many Web sites use one or more databasesAnytime you type keywords in a search site

or hunt for a product on a retail store’s Web site using its search feature, you are using a Web database

Default Access 2007 file format is .accdb