1. Why Do I Need a Database? Lesson One – ACCESS 2007

2. Access 2007 is a program that allows you to create and manage databases. A database is a place where you can store information related to a specific topic. How you intend to use the information will determine whether you need an Access database or a different program to create and manage your data. In this lesson, we will discuss what a database does and how to decide whether you need a database to manage your information. 2 Guevarra Instititute of Technology

3. What is a Database? A database allows you to store information related to a specific topic in an organized way. In addition to storing data, you can also sort, extract, and summarize information related to the data. One of the software programs that allow you to do this is Microsoft Office Access 2007, which is a database creation and management program. 3 Guevarra Instititute of Technology

4. Why Not Use Excel? There are many types of data you may need to store and manage: text and numbers, for example. Depending on what you want your data to do for you, you may or may not need to use a database. You might be able to use a spreadsheet program like Microsoft Excel. How do you know which data can be adequately managed with Excel and which data really requires Access to manage it more efficiently? It depends on how much data you have to manage, and what you want your data to do for you. Let's try to answer this by looking at a bookstore scenario. If you work for a bookstore business, you might have to keep track of your customers and their orders. You could use Microsoft Excel to store and manage this type of data; however, Excel is a spreadsheet software program that is traditionally used to manage numerical information, like totaling up all purchases by one customer. While it can do an adequate job at storing some types of text-based data -- like the customer's name and contact information-- that is not really what Excel was designed to do. The following examples will show you why an Access Database may be a better choice for the bookstore business. 4 Guevarra Instititute of Technology

5. Excel Example: Customer List and Order Tracking Sorting and Filtering to Locate Data in Excel In Excel, you can store your data in a worksheet so that you can mail promotional information to the entire list or sort to find specific customers to target mail. You can even filter the customer information to display all the customers that live in a particular state, like in the following image. Additionally, you can sort the data to order it in a particular way. 5 Guevarra Instititute of Technology

6. Data Filtered to Display NC State Records However, if you want to see very specific results in your data, like how many orders a single customer placed in a year, Excel is not as efficient as Access at providing you with that data. 6 Guevarra Instititute of Technology

7. Data Entry in Excel If you use an Excel spreadsheet to track your orders, each time a customer places an order, you would have to enter a new row of information in the spreadsheet. This would likely include the customer's name and address. If that customer orders from your company more than once, that information would have to be entered each time. You spreadsheet would contain redundant information. 7 Guevarra Instititute of Technology

8. As you can see in the image above, customers Tonya Bullock and McKenzie Grant each placed several orders on different days and for different books. Their customer contact information was entered every time they placed an order. This is the limitation of spreadsheet software such as Excel because it is a single, flat file. 8 Guevarra Instititute of Technology

9. Access Example: Customers and Orders Tracking Entering Data in Access Microsoft Access is designed to manage information. Access allows you to enter the client's name, address, and phone number- the first time they do an order. This information is entered into an Access table designed to hold basic customer information on clients. A table is a list of related information in columns and rows. In a table, each row is called a record and each column is called a field . An Access table in Datasheet View looks similar to an Excel spreadsheet, as you can see below. 9 Guevarra Instititute of Technology

10. In addition to the table with customer information, you would probably also want a table with information about the products you sell, and a third table to hold data related to specific customer orders. These tables would all be linked together, to help you make the most out of your data. Access is called a relational database management program, because the tables are linked, or related, as you can see in the image below. In this example, the Customer Info and Orders tables are linked by Customer ID and Book ID. 10 Guevarra Instititute of Technology

11. Now, let's assume that you want to identify the book that was most popular in the state of North Carolina. With Access, this is possible because you can search and retrieve information from multiple tables at the same time. The Customer Info table contains information about the states, and the Order table includes information about which books were ordered. You will need information from both tables to identify the book that was most popular in a specific state. You could look at the information in these tables separately to answer your question of which book was most popular in North Carolina. In the Customer Info table, you could see all the customers from a specific state, NC. And in the Books table, you can see all the books that you have in stock. The real power of Access comes in being able to link and extract information from multiple tables to answer specific questions. 11 Guevarra Instititute of Technology

12. As you can see below, the results of your specific question, or query, are displayed for you. 12 Guevarra Instititute of Technology

13. Challenge Try to answer this questions: What is a database? What type of software program is Microsoft Office Excel? What type of software program is Microsoft Office Access? Think of at least two differences between Access and Excel. 13 Guevarra Instititute of Technology