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Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
Database
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Database

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  • 1. -CVSL-Grade VII & VIII
  • 2. Topics to be covered “what is a database;” Understand the difference between data and information; What is the purpose of a database system; Database definitions and fundamental building blocks; 2
  • 3. What is a databaseA database is any organized collection of data. Some examples of databases you may encounter in your daily life are:  a telephone book  T.V. Guide  airline reservation system  motor vehicle registration records  Forms you are filling for Admission 3
  • 4. Data vs. information:What is the difference?  What is data?  What is information?  Information is data that have  Data can be defined in been organized and many ways. Information communicated in a coherent and science defines data as meaningful manner. unprocessed information.  Data is converted into information, and information is converted into knowledge.  Knowledge; information evaluated and organized so that it can be used purposefully. 4
  • 5. What is the ultimate purpose of adatabase management system? Is to transform Data Information Knowledge Action 5
  • 6. Why do we need a database? Keep records of  Students  Staff  Library  Stocks To keep a record of activities and interventions; Keep sales records; Develop reports; Perform search Tracking a particular record 6
  • 7. Example of Database Ms Access FileMaker Lotus Notes Oracle SQL Server 7
  • 8. What is the purpose of thedatabase ?• A database management system (DBMS) provides you with the software tools you need to organize that data in a flexible manner.• It includes tools to add, modify or delete data from the database, ask questions (or queries) about the data stored in the database and produce reports summarizing selected contents. 8
  • 9. Some Important Definitions A File: A group or collection of similar records, like Student File, American History 1850-1866 file, Basic Food Group Nutrition File A field: one category of information, i.e., Name, Address, Semester Grade, Academic topic A record: one piece of data, i.e., one students information, a recipe, a test question A layout: a design for a database that contains field names and possibly graphics. 9
  • 10. Fundamental building blocks Tables comprise the fundamental building blocks of any database. If youre familiar with spreadsheets, youll find database tables extremely similar. Take a look at this example of a table sample database: The table above contains the employee information for our organization -- characteristics like name, date of birth and title. Examine the construction of the table and youll find that each column of the table corresponds to a specific employee characteristic (or attribute in database terms). Each row corresponds to one particular employee and contains his or her information. Thats all there is to it! If it helps, think of each one of these tables as a spreadsheet-style listing of information. 10
  • 11. What is Microsoft Access UsedFor? Microsoft Access is an information management tool that helps you store information for reference, reporting, and analysis. Microsoft Access can help you overcome the limitations found when trying to manage large amounts of information in Microsoft Excel or other spreadsheet applications. 11
  • 12. What is Microsoft Access made upof? The Microsoft® Access Database is made up of 7 major components:  Tables;  Relationships;  Queries;  Forms;  Reports;  Macros;  Modules. 12
  • 13. Tables The tables are the backbone and the storage container of the data entered into the database. The tables that contain data look a bit like a table in Microsoft® Word or a Microsoft® Excel Spreadsheet, when opened. They have columns and rows as does a table in Microsoft® Word and an Excel worksheet. Each of the columns will have a field name at the top and each of the rows will represent a record. As an example: Sl. No. Name Marks 1 Ratan 89 2 Mahima 90 3 Nisha 70 13
  • 14. Primary Key The primary key of a relational table uniquely identifies each record in the table. This can be a unique identification number such as a Medicare number, Employee ID number, Pension number, etc.: A primary key cannot contain duplicate values, e.g. a person’s last name is not suitable as a primary key as there is often more than one person with the same last name; A primary key cannot contain null values, therefore a field such as a phone number is not suitable, as you may not know the person’s phone number when you first enter them into the database; Also, if the information contained in the Primary Key is likely to be altered, then it is best to avoid this field as well. If a unique identifier cannot be identified (which is more than likely), you can add a field, which will automatically increase sequentially by one, thus providing the record with a unique identifier. 14
  • 15. Data type The data type of a programming element refers to what kind of data it can hold and how that data is stored. Data types apply to all values that can be stored in computer memory or participate in the evaluation of an expression. Example Name – hold alphabets Marks – number 15
  • 16. MS ACCESS DATATYPES AutoNumber Numbers that are automatically generated for each record. Currency Monetary values. Date/Time Dates and times. Hyperlink Hyperlinks, such as e-mail addresses. Memo Long blocks of text and text that use text formatting. A typical use of a Memo field would be a detailed product description. Number Numeric values, such as distances. Note that there is a separate data type for currency. OLE Object OLE objects, such as Word documents. Text Short, alphanumeric values, such as a last name or a street address. Yes/No Boolean values. 16
  • 17. You can view your Microsoft Access tables in twodifferent views - Datasheet view and Design view. Datasheet view : Access allow you to view the contents of a table. When opened, you will see something similar to a spreadsheet, with columns of data with the field names identifying each column, whilst each row is a single record within the table. This is called the datasheet view. Design view where you see the structure of the table rather than the contents. It shows the field names and their datatype. From design view you can add and delete fields within the table, although you have to be careful with deleting the primary key in the table as that would cause problem with data integrity. 17
  • 18. Query Notes yet to be write 18

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