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Now let s return to the REFERENCING clause of the CREATE TRIGGER statement. The purpose of this clause is to allow you to define correlation names for the rows stored in the transition tables or for the transition tables as a whole. As you ll recall from the Understand SQL Triggers section earlier in this chapter, the transition tables hold the data that has been updated, inserted, or deleted in the subject table. The correlation names, or aliases, can then be used in the triggered SQL statements to refer back to the data that is being held in the transition tables. This can be particularly handy when trying to modify data in a second table based on the data modified in the subject table. (This will be made clearer when we look at examples later in the chapter.)

14:

SELECT EMPL_NUM FROM SALESREPS WHERE REP_OFFICE IN (subquery) produces a column containing the employee numbers of the salespeople who work in one of the selected offices. Finally, the outermost query: SELECT COMPANY FROM CUSTOMERS WHERE CUST_REP IN (subquery) finds the customers whose salespeople have one of the selected employee numbers. The same technique used in this three-level query can be used to build queries with four or more levels. The ANSI/ISO SQL standard does not specify a maximum number of nesting levels, but in practice a query becomes much more time-consuming as the number of levels increases. The query also becomes more difficult to read, understand, and maintain when it involves more than one or two levels of subqueries. Many SQL implementations restrict the number of subquery levels to a relatively small number.

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If you refer back to the syntax in the previous section, you ll notice that the optional REFERENCING clause includes the <alias options> placeholder. SQL supports four options for this clause:

REFERENCING OLD [ROW] [AS] <alias> REFERENCING NEW [ROW] [AS] <alias> REFERENCING OLD TABLE [AS] <alias> REFERENCING NEW TABLE [AS] <alias>

If companies do put a value on human capital, then they must address whether and how employees should share in ownership, management, and governance Stock options go at it backwards, doling out a ticket to ownership in hopes that it will make employees and executives think and act like owners A far healthier approach is, first, to encourage the kind of action and behaviors that warrant having the chance to become owners Motivating employees to think and act like owners, however, is one of the biggest challenges of corporate managers today..

Notice that, in the first two options, the ROW keyword is not mandatory. If you don t specify ROW, it is assumed. Notice too that the AS keyword is optional in all cases. However, for the purposes of maintaining clear, self-referencing code, I recommend that you use the complete option whenever you include it in a trigger definition. Depending on the type of trigger (update, insert, or delete) and the FOR EACH option (ROW or STATEMENT), you can include up to four REFERENCING options in your trigger definition, one of each type. However, you cannot include more than one of any single type. For example, you cannot include two OLD ROW options in your trigger definition. When adding REFERENCING options to your trigger definition, you must follow these guidelines:

Correlated Subqueries *

You cannot use the NEW ROW and NEW TABLE options for delete triggers because no new data is created. You cannot use the OLD ROW and OLD TABLE options for insert triggers because no old data exists. You can use all four options in an update trigger because there is old data and new data when you update a table. You can use the OLD ROW and NEW ROW options only when you specify the FOR EACH ROW clause in the trigger definition.

Once you define your REFERENCING clauses and assign the appropriate aliases, you re ready to use those aliases in your triggered SQL statements, in the same way you used correlation names in your SELECT statements.

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