Microsoft Aceess
What is DBMS?
DBMS can hold large amount of data in its storage device. It is a particular type of application that interacts with user with another application and also analyses data. A database management system(DBMS) is particular type of software which is designed to store, retrieve, define, and manage data in a database.
What is Microsoft Access?
Microsoft Access is a Database Management System and comes as a part of the Microsoft Office. It offers the functionality of a database and the programming capabilities to create easy to navigate screens (forms). It helps us analyze large amounts of information, and manage data efficiently.
What is Database file?
Database Files are used to store the contents of the database in a structured format into a file in separate tables and fields.
What is database table?
Database table is collection of rows and columns. Actually table is a named relational database data set that is organized by rows and columns and composed of records and fields that hold data.
What is tuple or row?
Tuple: A single row of a table, which contains a single record for that relation is called a tuple.
What is records?
Records are composed of fields within a table that are relevant to a specific entity.
What is field?
Field is a data structure for a single piece of data. In the basis of field we declare variable.
What is variable?
Which value is changeable is called variable.
What is Data Type?
A data type specifies the type of data that a variable can store. A field's data storage format that a variable can store, such as field size, but also how the field is used throughout the database, such as in objects, calculations, expressions.
| Type of Data | Description | Size |
|---|---|---|
| Short Text | Text or combinations of text and numbers, including numbers that do not require calculating (e.g. phone numbers). | Up to 255 characters. |
| Long Text | Lengthy text or combinations of text and numbers. | Up to 63, 999 characters. |
| Number | Numeric data used in mathematical calculations. | 1, 2, 4, or 8 bytes (16 bytes if set to Replication ID). |
| Date/Time | Date and time values for the years 100 through 9999. | 8 bytes |
| Currency | Currency values and numeric data used in mathematical calculations involving data with one to four decimal places. | 8 bytes |
| AutoNumber | A unique sequential (incremented by 1) number or random number assigned by Microsoft Access whenever a new record is added to a table. | 4 bytes (16 bytes if set to Replication ID). |
| Yes/No | Yes and No values and fields that contain only one of two values (Yes/No, True/False, or On/Off). | 1 bit. |
● In Access 2013, we now have two data types, short text and long text. In previous versions of Access these data types were called text and memo.
● The text field is referred to as short text and your memo field is now called long text.
Here are some of the other more specialized data types, you can choose from in Access.
| Data Types | Description | Size |
|---|---|---|
Attachment | Files, such as digital photos. Multiple files can be attached per record. This data type is not available in earlier versions of Access. | Up to about 2 GB. |
OLE objects | OLE objects can store pictures, audio, video, or other BLOBs (Binary Large Objects) | Up to about 2 GB. |
Hyperlink | Text or combinations of text and numbers stored as text and used as a hyperlink address. | Up to 8,192 (each part of a Hyperlink data type can contain up to 2048 characters). |
Lookup Wizard | The Lookup Wizard entry in the Data Type column in the Design view is not actually a data type. When you choose this entry, a wizard starts to help you define either a simple or complex lookup field. A simple lookup field uses the contents of another table or a value list to validate the contents of a single value per row. A complex lookup field allows you to store multiple values of the same data type in each row. | Dependent on the data type of the lookup field. |
Calculated | You can create an expression that uses data from one or more fields. You can designate different result data types from the expression. | You can create an expression that uses data from one or more fields. You can designate different result data types from the expression. |
To create a database from a template, we first need to open MS Access.
1: Press winkey+R
2: Type msaccess under run box.
After then you will see the following screen in which different Access database templates are displayed.
3: Now Click on Blank Database
4: After then Blank database creation box appears.
5: Here we write name of database file under file name box and click on create button.
6: Now database structure creation box appears. Click on view tool and under it select design view.
7: After then following box appears.
8: Write here either name of table or click on ok button with default name Table1.
9: After then data structure creation box appears.
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