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When we think about the earth and its orbit, we can see how the earth rotates upon its axis, which is slightly inclined in relation to the sun. As the earth rotates at a constant speed, there will be certain points in the earth s orbit when the sun shines for longer on a certain part of the earth and furthermore, because of the earth s position in space, that part of the world will tend to be nearer to the sun on average over the period of a day. This is why we get the seasons this is illustrated in Figure 2-4. As a result of the sun appearing to be in a different place in the sky, we may need to move our solar devices to take account of this. Figure 2-5 illustrates how a flat plate collector may need to be moved at different times of the year to take account of the change in the sun s position in order to harness energy effectively.

I Column names appearing in a subquery may refer to columns of tables in the main query. These outer references are described in detail later in the Outer References section. I In most implementations, a subquery cannot be the UNION of several different SELECT statements; only a single SELECT is allowed. (The SQL2 standard allows much more powerful query expressions and relaxes this restriction, as described later in the section Advanced Queries in SQL2. )

Subqueries are most frequently used in the WHERE clause of a SQL statement. When a subquery appears in the WHERE clause, it works as part of the row selection process. The very simplest subqueries appear within a search condition and produce a value that is used to test the search condition. Here is an example of a simple subquery: List the salespeople whose quota is less than 10 percent of the companywide sales target.

SELECT LAST_NAME, MANAGER_LAST_NAME FROM EMPLOYEE_LIST ORDER BY LAST_NAME; LAST_NAME ------------------------Alexander Bernstein Chung MANAGER_LAST_NAME ------------------------Alexander Alexander

9:

SELECT NAME FROM SALESREPS WHERE QUOTA < (.1 * (SELECT SUM(TARGET) FROM OFFICES)) NAME ---------Bob Smith

In this case, the subquery calculates the sum of the sales targets for all of the offices to determine the companywide target, which is multiplied by 10 percent to determine the cutoff sales quota for the query. That value is then used in the search condition to check each row of the SALESREPS table and find the requested names. In this simple case, the subquery produces the same value for every row of the SALESREPS table; the QUOTA value for each salesperson is compared to the same companywide number. In fact, you could carry out this query by first performing the subquery, to calculate the cutoff quota amount ($275,000 in the sample database), and then carry out the main query using this number in a simple WHERE clause:

It s more convenient to use the subquery, but it s not essential. Usually, subqueries are not this simple. For example, consider once again the query from the previous section: List the offices where the sales target for the office exceeds the sum of the individual salespeople s quotas.

For a movie catalog listing, you want to list the MPAA Rating Description and the Movie Genre Description. It seems obvious that this three-table join will be needed quite often, so you help the video store staff by creating a view with the joins already done for them. Here is the SQL statement to create the view:

SELECT CITY FROM OFFICES WHERE TARGET > (SELECT SUM(QUOTA) FROM SALESREPS WHERE REP_OFFICE = OFFICE) CITY -----------Chicago Los Angeles

In this (more typical) case, the subquery cannot be calculated once for the entire query. The subquery produces a different value for each office, based on the quotas of the salespeople in that particular office. Figure 9-2 shows conceptually how SQL carries out the query. The main query draws its data from the OFFICES table, and the WHERE clause selects which offices will be included in the query results. SQL goes through the rows of the OFFICES table one by one, applying the test stated in the WHERE clause.

The earth changing position in space The earth rotating The earth s atmosphere (gases, clouds, and dust)

Figure 9-2.