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SELECT Countrycountry, Note here the use of the alias name Resort_Countrycountry, sum(Invoice_Linedays * Invoice_Linenb_guests * Serviceprice) FROM Country, Declaring the alias here allows it to be used Country Resort_Country, elsewhere in the query Invoice_Line, Service, Resort, Service_Line, Sales, Customer, City, Region WHERE ( Citycity_id=Customercity_id ) AND ( Cityregion_id=Regionregion_id ) AND ( Countrycountry_id=Regioncountry_id ) AND ( Resort_Countrycountry_id=Resortcountry_id ) AND ( Customercust_id=Salescust_id ) AND ( Salesinv_id=Invoice_Lineinv_id ) AND ( Invoice_Lineservice_id=Serviceservice_id ) AND ( Resortresort_id=Service_Lineresort_id ) AND ( Servicesl_id=Service_Linesl_id ) AND ( Countrycountry = Germany AND

public virtual Stream GetRequestStream( ) public virtual WebResponse GetResponse( )

TABLE 26-1

(911)

8:

Part II:

Property public AuthenticationLevel AuthenticationLevel( get; set; } public virtual RequestCachePolicy CachePolicy { get; set; } public virtual string ConnectionGroupName { get; set; } public virtual long ContentLength { get; set; } public virtual string ContentType { get; set; } public virtual ICredentials Credentials { get; set; } public static RequestCachePolicy DefaultCachePolicy { get; set; } public static IWebProxy DefaultWebProxy { get; set; } public virtual WebHeaderCollection Headers{ get; set; } public TokenImpersonationLevel ImpersonationLevel { get; set; } public virtual string Method { get; set; } public virtual bool PreAuthenticate { get; set; }

= maximum compressive stress at any point, lb/in2 = normal load on cam pro le, lb = radii of curvature of cam and follower, respectively, in = thickness of contacting cam and follower, in = Poisson s ratio for cam and follower, respectively, having average values: steel = 030; cast iron = 027; bronze = 034 Ec and Ef = modules of elasticity of cam and follower, respectively, psi Average values are: steel = 30,000,000; cast iron = 12,000,000 to 23,000,000, depending on class; brass or bronze = 15,000,000; nylon = 400,000 smax P rc and rf th mc and mf

Self-joins are a way of joining a table to itself You may need to use one as a way of restricting rows in a table or because the same values are used in two columns in the same table A classic example is that of employees Employees have managers Thus, the employee ID in one column is also used in the manager ID in another column The following example uses data from Oracle s HR sample schema In this schema, every employee has a supervisor, except for the main boss, Steven King (thus, you need an outer join for this one employee) Managers may supervise one or more employees As you see in Figure 8-9, the Employee Id is also used to indicate the Manager Id in the same table So Employee ID 100, Steven King, manages Neena Kochhar (101) and Lex De Haan (102) Steven King, as the head boss, does not have a manager; to see this requires an outer join To implement the self-join, first create an alias for the EMPLOYEE called EMP_MANAGER, as shown here:

Description Obtains or sets the authentication level Obtains or sets the cache policy, which controls when a response can be obtained from the cache Obtains or sets the connection group name Connection groups are a way of creating a set of requests They are not needed for simple Internet transactions Obtains or sets the length of the content Obtains or sets the description of the content Obtains or sets credentials Obtains or sets the default cache policy, which controls when a request can be obtained from the cache Obtains or sets the default proxy Obtains or sets a collection of the headers Obtains or sets the impersonation level Obtains or sets the protocol If true, authentication information is included when the request is sent If false, authentication information is provided only when requested by the URI Obtains or sets the proxy server This applies only to environments in which a proxy server is used Obtains the URI of the request Obtains or sets the number of milliseconds that a request will wait for a response To wait forever, use TimeoutInfinite Obtains or sets a value that determines if default credentials are used for authentication If true, the default credentials (ie, those of the user) are used They are not used if false

public virtual IWebProxy Proxy { get; set; } public virtual Uri RequestUri { get; } public virtual int Timeout { get; set; }

Part II: