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DATABASE |
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What is database ? Database is used to store organized collection of related information on a certain subject.
What is data? Data is unorganized and meaningless raw facts suitable to be processed by computer
Eg:- number , text , images , ect ………………
How does a database help a user ? If the user has a stored collection of information on a certain subject he can sort , he can also compare the data , he can compare the data , he can make a report on the data and can have a quick or sudden access to the data.
Name 5 common database packages? · Microsoft Access · Microsoft SQL (Structured Query Language ) · My SQL · Oracle · Visual Fox Pro
HIERACHY OF A DATABASE
What is data file? A file is a unit of information that may hold a document , a program or collection of database tables with the database package extension.
Eg– school . mdb - Microsoft Access Database School . Sql - sql database.
What is database table ? A collection of records about a specific topic . There can be multiple table in a database .
Eg - student table , staff table.
What is record ? Record is a part of a table and it holds a collection of related data fields . It is a collection information about one or many thing related to a subject. Eg: database of address may have 100 record.
What is fields? A field is a part of record use to hold a specific type off information . A single records contains many fields. And field is a column in a table. Eg: In address table name, address , street no, postal code.
What is data type? Data can be separated according its own characteristics .The property of each field has 1 a data type. Eg: Field:data of birth –data type:date /time Field:name -data type :text Field:image-data type:objects
Data Types
· Text— this can include numbers, letters , and symbols can contain up to 255 characters.
· Memo- this field can include an almost infinite amount of text.
· Number– can include numbers only (not currency or a date)
· Data\ time—simply a date and time
· Currency– a number formatted as an amount of money can insert money values only.
· Auto number– Ms access automatically fills in a consecutive number for each record.
· Yes /No –It can store only 2 values. Yes /No
Table
Table - A collection of related data items within a database.
How to make a database table using Microsoft Access ?
· First make a database and give a name start - all programs - ms access - select a blank database - give a file name - create. · Click ‘create a table in design view ’ - enter field name , data type of what you need - and give a suitable table name for the created table .
Queries
Queries stored instructions that select data from one or more tables for reporting , analysis , and data management purposes.
How to create a query? · Select query table and double click on create query in design view. · Show table will appear .Select your table (student) and click on add button . Then close the window. · Then you will get a window. · Select the field name from the table and drag and drop them onto each column of field row . · Type a query to sort first name in ascending under the sort field . Then click on run icon . · Now see whether the first name column is in the ascending order .
What is Query ? Query is a request which we can filter data from the database according to the user’s request . Stored instructions that select data from one or more tables for reporting , analysis , and data management purpose .
What is data forms? This is a layout to represent data to navigate and can add , amend and delete record to database.
How to make forms?
What does DBMS stand for ? Database Management System . It tells you to create organized , manage your data store in databases. |
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DATABASE FILE |
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TABLE |
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RECORDS |
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DATA TYPES |
