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ENAME MSAL COMM -------- -------- -------SMITH 800 SQL> Note that this solution uses the COALESCE function, which you need to make comparisons with null values evaluate to true, in this case. The solution uses the value 1 based on the reasonable assumption that the commission column never contains negative values. However, if you check the definition of the EMPLOYEES table, you will see that there actually is no constraint to allow only nonnegative commission values. It looks like you found a possible data model enhancement here. Such a constraint would make your solution using the negative value in the COALESCE function correct under all circumstances. 6. Look again at Listings 9-4 and 9-5. Are they really logically equivalent Just for testing purposes, search on a nonexisting job and execute both queries again. Explain the results. Solution 9-6. SQL> select e.empno, e.ename, e.job, e.msal 2 from employees e 3 where e.msal > ALL (select b.msal 4 from employees b 5 where b.job = 'BARTENDER'); EMPNO -------7369 7499 7521 7566 7654 7698 7782 7788 7839 7844 7876 7900 7902 7934 ENAME -------SMITH ALLEN WARD JONES MARTIN BLAKE CLARK SCOTT KING TURNER ADAMS JONES FORD MILLER JOB MSAL -------- -------TRAINER 800 SALESREP 1600 SALESREP 1250 MANAGER 2975 SALESREP 1250 MANAGER 2850 MANAGER 2450 TRAINER 3000 DIRECTOR 5000 SALESREP 1500 TRAINER 1100 ADMIN 800 TRAINER 3000 ADMIN 1300

Let s take a quick look at the Canvas, shown in Figure 10-6 At first glance it seems to mirror the Video panel of the Viewer from the previous section For instance, the jog control, which was on the right side of the Video panel, is on the left side in the Canvas Likewise, the shuttle control mirrors that of the Video panel, residing here on the right The time code readouts at the top of the Canvas, however, are in the same configuration as those found in the Video panel On the left is the duration readout, which tells the complete length of time for the entire sequence, not just for the one clip And the time code on the right reads out the playhead position in the entire sequence again, not just within the selected clip The Canvas is a representation of your entire video sequence Its controls refer to the Timeline, not to the clips Whenever you click Play while working in the Timeline, you see your video sequence in the Canvas So why, then, do we not drag our clips directly into the Timeline Follow along here and you ll see why Select your clip in the Video panel and slowly drag it across to the Canvas As your mouse drag enters the Canvas window s space, a group of command areas automatically appears, as shown in Figure 10-6 Each of the colored areas represents a method of applying your clip to the Timeline This is sort of a built-in shortcut

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The Taylor Hyperpigmentation Scale is a visual scale introduced by Taylor et al in 20052 This assessment is composed of 15 colored plastic cards that are applicable to Fitzpatrick skin classification types I to VI Each card has 10 progressively darker bands of skin color gradations, demonstrating the increasing level of hyperpigmentation The combination of 15 cards each with 10 increasingly darker bands provides the dermatologist with a wide range of skin hues by which to render an evaluation This system is an inexpensive and effective approach to patient followup and assessment of treatment response However, there is a significant intra- and interindividual difference of grading among the investigators2 (see Figure 14-1 in 14)

SQL> select e.empno, e.ename, e.job, e.msal 2 from employees e 3 where e.msal > (select MAX(b.msal) 4 from employees b 5 where b.job = 'BARTENDER'); no rows selected SQL> This example searches for BARTENDER. The subquery returns an empty set, because the EMPLOYEES table contains no bartenders. Therefore, the > ALL condition of the first query is true for every row of the EMPLOYEES table. This outcome complies with an important law derived from mathematical logic. The following statement is always true, regardless of the expression you specify following the colon: For all elements x of the empty set: This explains why you see all 14 employees in the result of the first query. The second query uses a different approach, using the MAX function in the subquery. The maximum of an empty set results in a null value, so the WHERE clause becomes WHERE E.MSAL > NULL, which returns unknown for every row. This explains why the second query returns no rows. 7. You saw a series of examples in this chapter about all employees that ever taught an SQL course (in Listings 9-9 through 9-11). How can you adapt these queries in such a way that they answer the negation of the same question ( all employees that never ) Solution 9-7a. Negation of Listing 9-9 SQL> select e.* 2 from employees e 3 where NOT exists (select 4 from 5 where 6 and EMPNO ----7499 7521 7566 7654 7698 7782 7788 7839 ENAME -------ALLEN WARD JONES MARTIN BLAKE CLARK SCOTT KING INIT ----JAM TF JM P R AB SCJ CC

o.* offerings o o.course = 'SQL' o.trainer = e.empno);

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