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names, street addresses, cities, states, and ZIP codes form a table in a database A DBMS is the software you use to Save data Retrieve data Update data Manipulate data Delete data The way in which a DBMS structures data in a database is called a database model There are a number of different database models, ways data can be structured in a database One of the most popular of them is the relational database model The term relational database model is a little imposing at first, but this means relating tables within a database For example, depending on an application, data related to a person's address (street, city, state, ZIP) are similar data and are therefore placed in one group The parts of a person's name (first name, middle name, last name) are also similar data and are placed in another group A group is called a table A table is like a table of a spreadsheet in that both have columns and rows A table is also given a unique name to distinguish it from other tables in the database Each column represents a piece of data and is identified by a unique name, called a column name For example, the table that contains a person's name will have the following columns (see Figure 9-1) Each row (or record) represents one set of data, such as a person Each column is defined by attributes that describe the characteristics of the data that is stored in the column Later in this chapter we'll take a look at these attributes; however, here are three commonly defined attributes:
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Column name Name of the column Data type The kind of data that can be stored in the column Size The number of characters that can be stored in the column
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Customer Table Customer First Name Bob M ~ Y Customer Middle Name Allen Alice Customer Last Name Smith Jones
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Figure 9-1 A table within a database
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TIP: The database name, table name, column name, and its attributes are referred
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to as metadata Metadata is data that describes other data
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Relating Tables
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You might be wondering how you access information that appears in two or more tables For example, if one table has customer information (ie, customer name) and another table has order information, how to you link the customer information to the customer's order information This is done by using a column that is common to both tables In this case, a column called customer number is the common column Figure 9-2 shows two tables First is the customer table, and the other is the order table The customer table is similar to Figure 9- 1 except we inserted the customer number column The customer number is a unique number assigned to each customer Customer numbers are preferred over customer names to identify customers, because two customers might have the same name The order table consists of information that is typically associated with an order We limited this to the order number, customer number, product number, and quantity ordered to show how tables are linked together We'll insert additional columns in this table later in this chapter
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Customer Table
1 :::;
Customer Number
Customer First Name Bob Mary
Customer Middle Name Allen Alice
Customer Last Name Smith Jones
Order Table Number
Product Number AlS67 BR8765
Quantity
Figure 9-2 The customer table is linked to the order table using the customer number
Databases
Only the customer table is needed if we want to look up a customer name However, both the customer table and the order table are needed to look up an order because the order table doesn't contain the customer name We do this by first finding the order number of the order we want in the order table So if we wanted order 7654, we look in the order number column to find it Next we read the customer number of that row, which is 1002 We then find customer number 1002 in the customer number column of the customer table The row containing 1002 also contains the name of the customer who placed the order This process is called relating two tables and is why a database management system is called a relational database management system-it is capable of relating tables together
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