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SELECT COUNT(*) AS TOTAL_ROWS FROM ARTIST_CDS WHERE NUMBER_SOLD > 20;

Based on the new policy and communications with department heads and users, Xenico Pharmaceuticals has an excellent opportunity to regain trust in its information systems..

The value returned will now be 7, rather than 10, because only seven rows meet the search condition specified in the WHERE clause. You might find that, instead of querying the number of rows in a table, you want to know the number of values in a given column (excluding null values). In this case, you would specify the column name rather than the asterisk. For example, suppose you modify the SELECT statement shown in the last example to count values in the ARTIST_NAME column:

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When this occurs, you must invent a unique identi er, often with data values assigned sequentially or randomly as rows of data are added to the database table This technique is the source of such unique identi ers as social security numbers, employee IDs, and vehicle identi cation numbers The Movie relation in Figure 1-3 presents us with a bit of a poser in nding a unique identi er At rst, it would seem that Movie ID would work just ne However, notice that Movie ID values 2 and 3 appear twice each, so clearly it s not unique The problem is that the Movie ID uniquely identi es each movie title, but the video store is keeping track of each copy of the movie they have in stock This is because they rent movies and they want to be sure the renter returns the exact copy that they borrowed.

SELECT COUNT(ARTIST_NAME) AS TOTAL_ARTISTS FROM ARTIST_CDS WHERE NUMBER_SOLD > 20;

The real key in protecting information for such a large enterprise environment is in communications. All users should be aware of the data protection policies and should have some say in their design. The other portion of the solution the technical one was accomplished by means of some relatively minor changes to the server configurations. By utilizing the new setup, it will be possible to track when users logs on as Administrators, and to know which individual performed this action. If the problems truly were simple mistakes or coincidental, the server logs would show when changes were made and, in most cases, the effects of these changes. If the problems were caused by malicious intent, on the other hand, management would have a way of uniquely identifying those responsible. It was important that all of those affected were notified of changes during the implementation of these security features, and the reasons for each were well explained. This solution is fine for the present moment and meets many of the challenges the organization faces. In the future, however, the company will need to address other business problems. The data protection policy itself should be treated as a living document. As business needs change, so, too, should the policies. Constant input from users is also a must. Remember, a good data protection plan will involve a good balance between security

When you execute this query, the value returned is again 7. This means that seven ARTIST_NAME values have a NUMBER_SOLD value greater than 20. However, this statement doesn t account for ARTIST_NAME values that might be duplicated. If you want to arrive at a count that takes into consideration duplicate values, you can add the DISTINCT keyword to the COUNT function:

SELECT COUNT(DISTINCT ARTIST_NAME) AS TOTAL_ARTISTS FROM ARTIST_CDS WHERE NUMBER_SOLD > 20;

9:

After inspection of the sample data and some discussion with the store s manager, you conclude that there is no combination of attributes in the Movie relation that will uniquely identify each movie copy, so you invent an attribute called Copy Number that you can add to the relation Whenever a unique identi er (or part of one) is invented, it is very important that everyone understands the values the unique identi er will assume In this case, the store manager decided she wanted the Copy Number to start over for each Movie ID, which means the Copy Number is only unique when concatenated with Movie ID The resulting relation is shown in Figure 1-4..

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