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All three sections of the block structure are optional. It s common to see the structure used with only the BEGIN END sequence to define a statement sequence, or with a DECLARE BEGIN END sequence to declare variables and a sequence of statements. As with Informix, the Oracle structures that specify conditional execution and looping have a self-defining end-of-statement marker, so sequences of statements within these structures do not necessarily need an explicit BEGIN END statement block structure.

In addition to stored procedures, most SPL dialects support a stored function capability. The distinction is that a stored function returns a value while a stored procedure does not. Here s a simple example of a stored function. Assume you want to define a stored procedure that, given a customer number, calculates the total current order amount for that customer. If you define the procedure as a function, the total amount can be returned as its value. Figure 20-7 shows an Oracle stored function that calculates the total amount of current orders for a customer, given the customer number. Note the RETURNS clause in the procedure definition, which tells the DBMS the data type of the value being returned. In most DBMS products, if you enter a function call via the interactive SQL capability, the function value is displayed in response. Within a stored procedure, you can call a stored function and use its return value in calculations or store it in a variable. Many SPL dialects also allow you to use a stored function as a user-defined function within SQL value expressions. This is true of the Oracle PL/SQL dialect, so this use of the function defined in Figure 20-7 within a search condition is legal:

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SELECT FROM WHERE AND COMPANY, NAME CUSTOMERS, SALESREPS CUST_REP = EMPL_NUM GET_TOT_ORDS(CUST_NUM) > 10000.00

structured programming helped bolster the name SQL over the names coined by other vendors of the day for their data query languages. SQL standards committees were formed by ANSI (American National Standards Institute) in 1986 and ISO (International Organization for Standardization) in 1987. Fortunately, the committees from the two organizations worked together to develop a common, worldwide SQL standard. Two years later, the rst standard speci cation, known as SQL-89, was published. The standard was expanded three years later into SQL-92, which weighed in at roughly 600 pages. The third generation was called SQL-99, or SQL3. Most RDBMS products are built to the SQL-92 (now called SQL2) standard. SQL3 includes many of the object features required for SQL to operate on an object-relational database, as well as language extensions to make SQL computationally complete (adding looping, branching, and case constructs). The most recent generation, known as SQL:2003, introduces XML-related features and other enhancements. Only a few vendors have implemented signi cant components of the SQL3 and SQL:2003 standards. While DBMS vendors have teams of people devoted to standards compliance, most people who write SQL are

/* Return total order amount for a customer */ create function get_tot_ords(c_num in integer) return number(16,2) as /* Declare one local variable to hold the total */ declare tot_ord number(16,2); begin /* Simple single-row query to get total */ select sum(amount) into tot_ord from orders where cust = c_num; /* return the retrieved value as fcn value */ return tot_ord; end;

Figure 20-7.

As the DBMS evaluates the search condition for each row of prospective query results, it uses the customer number of the current candidate row as an argument to the GET_TOT_ORDERS function and checks to see if it exceeds the $10,000 threshold. This same query could be expressed as a grouped query, with the ORDERS table also included in the FROM clause, and the results grouped by customer and salesperson. In many implementations, the DBMS carries out the grouped query more efficiently than the preceding one, which probably forces the DBMS to process the orders table once for each customer. Figure 20-8 shows the Informix SPL definition for the same stored function shown in Figure 20-7. Except for stylistic variations, it differs very little from the Oracle version. Transact-SQL does not have a stored function capability like the one illustrated in Figures 20-7 and 20-8. Transact-SQL stored procedures can explicitly return a status code, and they use a RETURN statement for this purpose. However, the returned value is always an integer status value. A zero return value indicates successful completion of the stored procedure; negative return values are used to indicate various types of errors. The system-defined stored procedures in Sybase Adaptive Server and Microsoft SQL Server all use this return status value convention. The return status of a called

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