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The plan scans the Customers table and filters customers from Spain. For each matching customer, the plan performs a seek within the index on Orders.CustomerID . The Top operator appears because it's only necessary to see whether there's at least one matching order for the customerthat's the short-circuiting capability of EXISTS in action. This use of Top is particularly efficient when the Orders.CustomerID column has a high density (that is, a large number of duplicates). The seek takes place only once for each customer, and regardless of the number of orders the customer has, only one row is scanned at the leaf level (bottom level of the index) to look for a match, as opposed to all matching rows. In this case, the following solution using the NOT IN predicate does yield the same output. It seems to have the same meaning, but we'll see later that it does not. SELECT CustomerID, CompanyName FROM dbo.Customers AS C WHERE Country = N'Spain' AND CustomerID NOT IN(SELECT CustomerID FROM dbo.Orders);

Finally, to present the hierarchy of employees so that a subordinate appears under and to the right of its manager, use the following query:

The property that contains the parameter string that was passed to the logger. If true, then a summary of errors and warnings will be passed to the logger. If true, then the log message stating that a project that is beginning to build is not passed to the logger. Determines the amount of detail that should be contained in the log. Possible values; quiet (q), minimal (m), normal (n), detailed (d), and diagnostic (diag). The delegate that will be called to physically write log statements. In custom implementations that are not logging to the console, you will need to override this property.

00:00:02.0017692: Safe2DimArrayAccess 00:00:01.5197844: SafeJaggedArrayAccess 00:00:01.7343436: Unsafe2DimArrayAccess

-- "Regular" history ELSE INSERT INTO Production.SuppliersNames_During (supplierid, companyname, during) SELECT supplierid, companyname, @intv FROM deleted; END; GO

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To disconnect a mapped drive, simply use the /Delete switch with the Net Use command:

10 . . Configure the control to use SqlDataSource1 that you just added:

4. 5.

The following exercises will help you to better understand the concepts described in this chapter. The answers are presented in Appendix D. 1. 2. 3. Listing 7-5 defines the constraint E_SALES_CHK in a rather cryptic way. Formulate the same constraint without using DECODE and NVL2. Why do you think the constraint E_DEPT_FK (in Listing 7-7) is created with a separate ALTER TABLE command Although this is not covered in this chapter, try to come up with an explanation of the following phenomenon: when using sequences, you cannot use the pseudo column CURRVAL in your session without first calling the pseudo column NEXTVAL: SQL> select deptno_seq.currval from dual; select deptno_seq.currval from dual * ERROR at line 1: ORA-08002: sequence DEPTNO_SEQ.CURRVAL is not yet defined in this session SQL> 4. 5. 6. Why is it better to use sequences in a multiuser environment, as opposed to maintaining a secondary table with the last/current sequence values How is it possible that the EVALUATION column of the REGISTRATIONS table accepts null values, in spite of the constraint R_EVAL_CHK (see Listing 7-11) If you define a PRIMARY KEY or UNIQUE constraint, the Oracle DBMS normally creates a unique index under the covers (if none of the existing indexes can be used) to check the constraint. Investigate and explain what happens if you define such a constraint as DEFERRABLE. You can use function-based indexes to implement conditional uniqueness constraints. Create a unique function-based index on the REGISTRATIONS table to check the following constraint: employees are allowed to attend the OAU course only once. They may attend other courses as many times as they like. Test your solution with the following command (it should fail): SQL> insert into registrations values (7900,'OAU',trunc(sysdate),null); Hint: You can use a CASE expression in the index expression.

Arrays are the simplest and most common type of structured data. In some languages, arrays are the only type of structured data. An array contains a group of items that are all of the same type and that are directly accessed through the use of an array index. Here are some tips on using arrays.

Tells you the average number of items in stock. Counts how many different sizes are available. Counts how many different parts each component has. Identifies the largest quantity of any one item in stock. Because there is an odd number of values, it returns the middle value. If there were an even number, it would average to the two middle values. Identifies the smallest quantity of any one item in stock. Identifies the most frequently recurring value. If no value repeats, it returns #N/A. Tells you the amount of variance in the numbers of items in stock, by size. A large number might be an indication that you need to sell off some stock.

<style in="@{checkstyle-xml-report-file}" out="@{checkstyle-html-report-file}" style="@{checkstyle-stylesheet}" /> </sequential> </macrodef> A sample Checkstyle report is shown in Figure 3-6.

5

Figure 11-2 Server Core is a stripped-down version of Windows Server that supports only a subset of the roles.