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Using SQL Data Types
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Now that you ve taken a look at the various predefined data types, let s look at a CREATE TABLE statement that defines a table with columns that use different data types. In the following example, the statement is creating a table named ARTISTS that includes four columns:
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CREATE TABLE ARTISTS ( ARTIST_ID INT, ARTIST_NAME VARCHAR(60), ARTIST_DOB DATE, POSTER_IN_STOCK BOOLEAN );
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ARTIST_ID: INT 10001 10002 10005 10006 10008 10009
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ARTIST_NAME: VARCHAR(60) Jennifer Warnes Joni Mitchell Bing Crosby Patsy Cline Placido Domingo Luciano Pavarotti
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ARTIST_DOB: DATE 1947-03-03 1943-11-07 1904-05-02 1932-09-08 1941-01-21 1935-10-12
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POSTER_IN_STOCK: BOOLEAN False Unknown True True False Unknown
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The ARTISTS table defined with different data types
As you can see, the ARTIST_ID column is a numeric data type, the ARTIST_NAME column a string data type, the ARTIST_DOB column is a datetime data type, and the POSTER_IN_STOCK is a Boolean data type. Figure 3-2 illustrates how this table might look.
Create User-Defined Types
In 1, I mentioned that the SQL:2006 standard has incorporated some of the principles of object-oriented programming (OOP) into its language. One example of this is the userdefined type, sometimes referred to as the user-defined data type. The user-defined type is a type of data type (stored as a schema object) that is in part defined by the programmer and in part based on one or more data types. SQL supports two types of user-defined types:
Structured types These types are made up of one or more attributes that are each based on another data type, including predefined types, constructed types, and other structured types. In addition to being associated with a data type, each attribute can include a default clause and can specify a collation. A structured type can include methods in its definition. A method is a type of function that s associated with a userdefined type. A function is a named operation that performs predefined tasks that you can t normally perform by using SQL statements alone. It is a type of routine that takes input parameters (which are sometimes optional) and returns a single value based on those parameters. Distinct types These types are simply based on predefined data types and whatever parameters are defined for that data type, if parameters are required or desired.
SQL: A Beginner s Guide
SQL provides a CREATE TYPE statement for defining user-defined types. However, the language used for creating a user-defined type can vary from product to product. The features that are supported in a user-defined type also vary widely. For example, SQL Server 2000 does not support a CREATE TYPE statement, but SQL Server 2005 does. Despite the differences with and limitations of product implementations, I want to at least provide an example of how the CREATE TYPE statement is used to create a distinct type. In the following statement, I create a user-defined type that is based on the NUMERIC data type:
CREATE TYPE SALARY AS NUMERIC(8,2) FINAL;
This simple example is straightforward enough, creating a type named SALARY with a data type of NUMERIC(8,2). However, the keyword FINAL is probably new to you. When FINAL is specified, it tells SQL that no subtypes will be defined for this type. The alternative is to specify NOT FINAL, which means that subtypes may be defined for the type. Once you ve created the type, you can use it in a column definition as you would a predefined data type:
CREATE TABLE EMPLOYEES ( EMPLOYEE_ID INTEGER, EMPLOYEE_SALARY SALARY );
Any values you add to the EMPLOYEE_SALARY column would have to conform to the specifications of the NUMERIC data type with a precision of 8 and a scale of 2. As a result, a value could be anything from 999999.99 to 999999.99. The nice part is that you can then use the SALARY user-defined type in any other tables that require similar values.
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