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PowerPoint Presentation
Open office .org BASE
SUBMITTED TO:-MR.SANJAY SAPRA SIR (Computer Teacher)SUBMITTED BY:-DEEPANSH GOEL 10TH B15CONTENTS
DATA BASE FUNCTIONING
How data base works
Advantages of data base
flat data base and relational data base
DBMS of openoffice.org
Creating a data base
Designing tables
Setting a primary key
Open an existing data base
Query
Data base functioning
A data base refers to a collection of related data and a database system is basically a computer based record keeping system.
In a typical file processing system, permanent record s are
stored in various files. A number of different application programs
are written to extract records from and add records to the
appropriate files. But this scheme has a number of major
limitations and disadvantages such as data redundancy ,data
inconsistency.C:\Program Files (x86)\Microsoft
Office\MEDIA\CAGCAT10\j0196400.wmfHow data base works?
The database systems do not maintain separate copies of the same data rather, all the data are kept at one kept at one place and al the application that require data refer to the centrally maintained data .now if any change is to be made to data it will be made at just one place and the same changes information will be available to all the applications referring to it.
Advantages of data base
Database reduce the data redudancy to a large extent.
Databases can control data inconsistency to a large extent.
Databases facilitate sharing of data.
Databases enforces standards
Databases can ensure data security
C:\Program Files (x86)\Microsoft
Office\MEDIA\CAGCAT10\j0195384.wmfFlat data base and relational
data base
When all the data is stored in one file then such a database is called flat database. A spreadsheet is an example of flat database.
When the data is stored in multiple tables that are linked via common field then such a database is called relational database. E.g. Microsoft access.
DBMS of Openoffice.org
Base which is the popular RDBMS a system that manage your database by offering a variety of features. BASE is also known as Ooo Base. Using BASE you can manage all your information from a single zip file that stores all related information files. The database file of base is stored with extension .
select the option create tables using table wizard to create the data base.
Specify the name for newly created database.
Read the information provided to you specify the information sought and next
Now select the desired fields from the tables shown. Firstly selects the samples table and then selects the field from it.
You may set fields data types and formats in this step.
Creating data base
6. determine the primary key.
Specify the title for newly created table as shown here. You also
need to specify the further action that you want.
Do as per your selected course of action
Setting primary key
Before you create your tables you need to design it properly. You must decide about number of fields required other property and the PRIMARY KEY.
Field name
Field types or data types
Length
Field property
Primary key
To set the primary key you need to follow the step-
Open a table in design view.
Select the field or fields you want to define as primary key.
Right click on the row selector button of the selected fields and click primary key.
Open existing database
To open an already existing database you can follow either of the two ways-
Selected the options open an existing database database from the open dialog box.
Then select the desired database name.
Then click finish.
or
Press Ctrl+O
Select the desired database and click OK.
Query
Basic steps to create a query in design view-
Select the object type queries in the database.
Perform the command create Query in the design view.
Select and add the tables from which to retrieve the result
Select the tables fields that are to be included in the query result.
Set the query criteria for the fields
Save the query entering a name for it.
THANK YOU
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