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You do not have to use an aggregate function (such as MAX) to return a single value in a subquery. For example, the subquery s WHERE clause might include a condition that will return only one value. The important point to remember is that you must be sure that your subquery returns only one value; otherwise, you will receive an error when using a comparison operator. However, if you ve set up your subquery properly, you can use any of the comparison operators to compare column values. In addition, you re not limited to numbers. Character strings can also be compared in comparison predicates.

In many cases, you can use predicates such as IN with subqueries that return only one value. However, these predicates can support only the conditions equal to (=) or not equal to (<>), not the conditions less than (<), less than or equal to (<=), greater than (>), or greater than or equal to (>=), all of which you can use with comparison operators.

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Business growth can come from repeat business or new business. Real business growth occurs when the business provides new products or services, thus acquiring new customers. To grow the business, the company must constantly monitor innovations that take place within the company and in the marketplace. External environmental factors must be monitored to drive internal innovation. Innovation can occur at any level, from a small component to a simple process. The objective is to make the product or perform the service better, faster, and less expensively tomorrow. Generally, an organization is structured so that the technology officer drives internal research and development, sales is focused on obtaining more sales, and marketing explores new areas. These functional areas aim to excel in their span of control and in achieving results. However, because business growth objectives often are not clearly established, they cannot be communicated and achieved. Just as with managing profitability, someone must be directly responsible for managing growth someone who can establish clear goals as well as a well-defined process and teamwork for achieving those growth objectives. There is often a disconnect between what R&D has designed, what the market wants, and when the market wants it. Just as when someone throws darts in the dark, some ideas may hit the intended target, while others will miss entirely. If objectives can be established and a direction can be set, the growth objectives are more likely to be achieved consistently rather than sporadically. Growing companies develop an internal focus on growth, where synergy is created and the business runs as a well-oiled machine. Many other businesses that do not have this focus, however, struggle to grow.

In the Using the EXISTS Predicate section earlier in this chapter, I mention that, for the EXISTS predicate to be useful, it should include in the subquery a search condition that matches values in the two tables that are being linked through the subquery. To illustrate this point, I include in that section an example SELECT statement that contains such a subquery. I ll repeat that statement here for your convenience:

12:

SELECT * FROM CD_STOCK s WHERE EXISTS ( SELECT TITLE FROM CD_ARTISTS a WHERE a.ARTIST_NAME = 'Joni Mitchell' AND s.CD_TITLE = a.TITLE );

This statement references the CD_STOCK and CD_ARTISTS tables in Figure 12-1. Notice that the subquery includes a predicate that matches CD_TITLE values in the CD_ STOCK table to TITLE values in the CD_ARTISTS table. This matching of values is similar to the equi-join conditions you define when joining tables. The reason I ve returned to this statement is that it includes a type of subquery I have not discussed before the correlated subquery. A correlated subquery is one that is dependent on the outer statement in some way. In this case, the outer statement is the main SELECT statement that includes a SELECT clause, a FROM clause, and a WHERE clause, which itself contains a subquery. Because that subquery references the CD_STOCK table, which is a component of the outer statement, the subquery is dependent on that statement in order to return data. In most of the subquery examples we ve looked at in this chapter, the subqueries have stood independent of the outer statement. For example, in the following SELECT statement (which was used as an example in the Using the IN Predicate section earlier in this chapter), the subquery is not dependent on the outer statement:

SELECT * FROM CD_STOCK WHERE CD_TITLE IN ( SELECT TITLE FROM CD_ARTISTS WHERE ARTIST_NAME = 'Joni Mitchell' );

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