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SQL Server also uses a RETURNS clause to assign a data type to the returned value, while Oracle uses a RETURN clause for the same purpose. In both cases this clause is followed by the AS keyword. Both SQL Server and Oracle use a RETURN statement in the routine body to define the value returned by the parameter.

Variants Visual Basic allows variables to be undeclared if the programmer so chooses. In such cases, the data type of the variable is determined implicitly by the value that is assigned to the variable. Such variables are referred to as Variant-type variables, or simply as variants. On the surface, the use of variants appears to simplify the program development process. This is a false perception, however, as the use of variants is computationally inefficient, and it compromises the clarity of a program. Good programming practice suggests that the use of variants be avoided. Use explicitly declared variables instead.

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A function definition can include many of the elements that have been described throughout this chapter. For example, you can define local variables, create compound statements, and use conditional statements. In addition, you can define and use input parameters in the same way you define and use input parameters in procedures (except that you do not use the IN keyword). Now that you have an overview of how to create a function, let s look at an example, which is based on the IN_STOCK_CDS and PERFORMERS tables, shown in Figure 13-2. The following CREATE FUNCTION statement defines a function that returns the artist name for a specified CD, as it appears in the IN_STOCK_CDS table:

CREATE FUNCTION CD_ARTIST ( p_Title VARCHAR(60) ) RETURNS VARCHAR(60) BEGIN RETURN ( SELECT ARTIST_NAME FROM IN_STOCK_CDS s, PERFORMERS p WHERE s.Title = p.Title AND s.Title = p_Title ); END;

In the first line of the statement, the CD_ARTIST function and the p_Title parameter have been defined. In the next line, the RETURNS clause assigns the VARCHAR(60) data type to the value returned by the function. In the routine body, you can see that a RETURN statement has been defined. The statement includes a subquery that uses the value of the input parameter to return the name of the artist. As you can see, defining a function is not much different from defining a procedure; however, calling the function is another matter. Instead of using the CALL statement to invoke the function, you use the function as you would any of the SQL predefined functions. (You saw some of these functions in 10.) For example, suppose you want to find the name

1. EMPLOYEE RECOGNITION (PERCENTAGE OF EMPLOYEES RECOGNIZED BY CEO)

13:

PERFORMERS TITLE: VARCHAR(60) Famous Blue Raincoat Blue Court and Spark Past Light Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits ARTIST_NAME: VARCHAR(60) Jennifer Warnes Joni Mitchell Joni Mitchell William Ackerman Kitaro Bing Crosby Patsy Cline

Named Constants It is also possible to define named constants in Visual Basic. Named constants are similar to variables. However, variables can be reassigned different values within a program, whereas named constants remain unchanged throughout a program.

After the Rain: The Soft Sounds of Erik Satie Pascal Roge Out of Africa Leonard Cohen The Best of Fundamental Blues on the Bayou Orlando John Barry Leonard Cohen Bonnie Raitt B.B. King David Motion

Figure 13-2

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