OBJECTIVES  Understand relational databases  Explore a database  Create a database  Create a table  Create primary keys  Relate two tables  Enter.

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Presentation transcript:

OBJECTIVES  Understand relational databases  Explore a database  Create a database  Create a table  Create primary keys  Relate two tables  Enter data  Edit data

UNDERSTANDING RELATIONAL DATABASES Microsoft Access 2010 is relational database software that runs on the Windows operating system. You use relational database software to manage data that is organized into lists, such as information about customers, products, vendors, employees, projects, or sales. Many small companies track customer, inventory, and sales information in a spreadsheet program such as Microsoft Excel. Although Excel offers some list management features, Access provides many more tools and advantages for managing data.

EXPLORING A DATABASE You can start Access from the Start menu, from an Access shortcut icon, from a pinned program on the taskbar, or by double-clicking an Access database file on your computer. When you start the Access program from the Start menu, Access displays a window that allows you to open an existing database or create a new one from a template or as a blank database.

CREATING A DATABASE You can create a database using an Access template, a sample database provided within the Microsoft Access program, or you can start with a blank database to create a database from scratch. Your decision depends on whether Access has a template that closely resembles the type of data you plan to manage. If it does, building your own database from a template might be faster than creating the database from scratch.

CREATING A TABLE After creating your database and first table, you need to create new, related tables to build a relational database. Creating a table consists of these essential tasks:  determining how the table will participate in the relational database.  meaningful naming of each field in the table.  selecting an appropriate data type for each field.  naming the table.

CREATING PRIMARY KEY S The primary key field of a table serves two important purposes. First, it contains data that uniquely identifies each record. No two records can have the exact same entry in the field designated as the primary key field. Secondly, the primary key field helps relate one table to another in a one-to-many relationship, where one record from one table is related to many records in the second table. For example, one record in the Customers table can be related to many records in the Comments table. The primary key field is always on the “one” side of a one-to-many relationship between two tables.

RELATING T WO TABLES After you create tables and set primary key fields, you must link the tables together in one-to-many relationships to enjoy the benefits of a relational database. A one-to- many relationship between two tables means that one record from the first table is related to many records in the second table.

ENTERING DATA Your skill in navigating and entering data is a key to your success with a relational database. You use either mouse or keystroke techniques to navigate the data in the table’s datasheet.

EDITING DATA Updating information in a database is another critical data management task. To change the contents of an existing record, navigate to the field you want to change and type the new information. You can delete unwanted data by clicking the field and using [Backspace] or [Delete] to delete text to the left or right of the insertion point.