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Column CustomerID LastName FirstName Address City State Zip Phone
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Data Type char six characters varchar varchar varchar varchar char two characters char five characters varchar
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Description Unique identifier for each customer Last name of customer First name of customer Street address of customer City of customer State of customer Postal ZIP code of customer Phone number of customer
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Table 4-2 Customer Table Columns
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a specific data type, depending on the type of data you intend to store in the column Which data elements are placed in which tables is a subject of many relational database theories For the purposes of this exercise, we will try to keep things somewhat simple Table 4-2 shows the columns that will be used for the Customer table The Customer table contains the necessary contact information for the customer It also contains a unique value added to the customer information to uniquely identify the customer in the database (in case you get two customers named John Smith, for example) There are two different data types used for the columns in the Customer table The char data type holds a fixed-length character string The length of the character string must be stated when the column is created The CustomerID column will be created as a six-character string, the State column as a two-character string, and the Zip column as a five-character string The varchar data type holds a variable-length character string This is for fields where you do not know the length of the data that could be entered The columns where the data lengths can vary widely, such as the street address, are set to use the varchar data type There are lots of data types defined within PostgreSQL Table 4-3 shows some of the more popular data types that are used This is just a small sampling of the many data types available The PostgreSQL Help window (in pgAdmin III, choose Help | PostgreSQL Help) contains information on all of the PostgreSQL data types available You can create the data columns either when you first create the table or after the table has already been created If you created the Customer table earlier, there are a couple of different methods you can use for adding columns You can double-click the new
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Data Type int2 int4 int8 bool float4 float8 numeric money char varchar date time timestamp
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Description Two-byte integer ( 32768 to +32768) Four-byte integer ( 2147483648 to +2147483648) Eight-byte integer ( 9223372036854775808 to +9223372036854775808) Logical True/False Boolean value Single-precision floating-point number Double-precision floating-point number User-defined-precision floating-point number Two-decimal place floating-point number Fixed-length character string Variable-length character string Calendar date Time of day Date and time
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Table 4-3 Common PostgreSQL Data Types
table object in pgAdmin III to bring up the standard Table Properties window or you can right-click the Columns object under the Customer table entry and select New Column I prefer to double-click the new table object, as it provides the entire Table Properties window to view In the Table Properties window, click the Columns tab to access the columns list In the Columns tab, click the Add button to add a new column The New Column window appears, shown in Figure 4-7 Fill in the forms for the information to define the column The Data Type textbox includes a handy drop-down menu that contains all of the available data types Select the appropriate data type for the column you are creating For the CustomerID and Phone columns, check the Not NULL check box This feature requires that these fields must be filled for the data record to be added to the table If either of these fields is missing, the new data record will be rejected As you enter columns in the table, they appear in the columns list in the Columns tab When you have entered all of the columns for the Customer table, click the Constraints tab The Constraints tab allows you to specify further constraints on the data in the columns
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