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As you see, numeric types allow negative numbers as well as zero and positive numbers. If negative numbers are not desired (which would obviously be the case for someone s salary), the data type alone won t do the job, but you can use a CHECK constraint for this purpose. I discuss CHECK constraints in 4.
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Specify Column Default Values
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Another valuable feature that SQL supports is the ability to specify a default value for a column when you re using the CREATE TABLE statement to create a table. The syntax for a simple column definition with a default value looks like this:
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<column name> <data type> DEFAULT <default value>
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The <column name> and <data type> placeholders, which should now be familiar, are followed by the DEFAULT keyword. After the DEFAULT keyword, you must specify a value for the <default value> placeholder. This value can be a literal, which is an SQL data
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value (such as the string To be determined or the number 0); a datetime value function, which is a function that allows you to perform operations related to dates and times (discussed in 10); or a session-related user function, which is a function that returns user-related information (discussed in 10). Whichever type of value you use for the <default value> placeholder, it must conform to the data requirements of the data type specified in the column definition. For example, if you define a column with an INT data type or a CHAR(4) data type, you cannot specify a default value of Unknown . In the first case, INT requires a numeric value, and in the second case, CHAR(4) requires that the value contain no more than four characters. In the following example, I use the CREATE TABLE statement to define a table named ARTISTS, which contains three columns:
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CREATE TABLE ARTISTS ( ARTIST_ID INT, ARTIST_NAME VARCHAR(60), PLACE_OF_BIRTH VARCHAR(60)
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DEFAULT 'Unknown' );
Notice that the PLACE_OF_BIRTH column includes the default value Unknown . The value is acceptable because it conforms to the data requirements of the VARCHAR(60) data type. Also notice that the default value is enclosed in single quotes. You must use single quotes for character string values. Figure 3-3 illustrates what this table might look like if it were populated with rows of data. If you were to insert any new rows into this table and you didn t know the artist s place of birth, the system would automatically insert a value of Unknown .
ARTIST_ID: INT 10001 10002 10005 10006 10008 10009
ARTIST_NAME: VARCHAR(60) Jennifer Warnes Joni Mitchell Bing Crosby Patsy Cline Placido Domingo Luciano Pavarotti
PLACE_OF_BIRTH: VARCHAR(60) Unknown Fort MacLeod, Alberta, Canada Tacoma, Washington, United States Winchester, Virginia, United States Madrid, Spain Unknown
Figure 3-3
A default value of Unknown for the PLACE_OF_BIRTH column
SQL: A Beginner s Guide
Try This 3-1
Creating SQL Tables
You ve probably noticed that I ve been using CD-related data for the examples I ve shown you so far. We will be carrying this theme throughout the book as we begin to build a database that tracks the CD inventory of a small business. In this exercise, you will create three tables that are related to the INVENTORY database, which you created in 2, Try This 2-1. Before you begin, take a look at a simple data model (Figure 3-4) that shows the three tables you ll be creating. Each table is represented by a rectangle, with the name of the table above the rectangle and the name of the columns, along with their data types, listed within the rectangle. We will be using the data model throughout the book as it evolves into a more complex structure to define the objects in our database. You can also download the Try_This_03.txt file, which contains the SQL statements used in this Try This exercise.
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