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CONSTRAINT FK_Company_Company FOREIGN KEY (ParentCompanyID) REFERENCES HumanResources.Company(CompanyID) The foreign key column ParentCompanyID must be nullable in order to handle a parent-child hierarchy. A company with a NULL parent is at the top of the company hierarchy (which means it doesn t have a parent company). After the table was created, three new rows were inserted. The first row inserted a company without designating the ParentCompanyID (which means the value for the ParentCompanyID column for this company is NULL): INSERT HumanResources.Company (CompanyID, CompanyName) VALUES(1, 'MegaCorp') The second insert created a company that references the first MegaCorp Company defined in the previous INSERT statement. The value of 1 was valid in the ParentCompanyID column, as it refers to the previously inserted row: INSERT HumanResources.Company (CompanyID, ParentCompanyID, CompanyName) VALUES(2, 1, 'Medi-Corp') The third insert tries to create a new company with a ParentCompanyID of 8, which does not exist in the table: INSERT HumanResources.Company (CompanyID, ParentCompanyID, CompanyName) VALUES(3, 8, 'Tiny-Corp') Because there is no company with a CompanyID of 8 in the table, the foreign key constraint prevents the row from being inserted and reports an error. The row is not inserted.

-A[symbol-specification], --annotated-source[=symbol-specification]

Foreign keys restrict the values that can be placed within the foreign key column or columns. If the associated primary key or unique value does not exist in the reference table, the INSERT or UPDATE to the table row fails. This restriction is bi-directional in that if an attempt is made to delete a primary key, but a row referencing that specific key exists in the foreign key table, an error will be returned. All referencing foreign key rows must be deleted prior to deleting the primary key or unique value in question, otherwise an error will be raised. SQL Server 2005 provides an automatic mechanism for handling changes in the primary key/unique key column, called cascading changes. In previous recipes, cascading options weren t used. You can allow cascading changes for deletions or updates using ON DELETE and ON UPDATE. The basic syntax for cascading options are as follows: [ ON DELETE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] [ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] [ NOT FOR REPLICATION ]

The process of building GCC is best approached as a series of smaller steps that organize the process into easily digestible bite-size morsels. The steps I will follow in this chapter include: 1. Verifying and satisfying software requirements 2. Preparing the installation system 3. Downloading the source code 4. Configuring the source code 5. Building the compiler 6. Testing the compiler 7. Installing the compiler

The default setting for a new foreign key is NO ACTION, meaning if an attempt to delete a row on the primary key/unique column occurs when there is a referencing value in a foreign key table, the attempt will raise an error and prevent the statement from executing. For ON DELETE, if CASCADE is chosen, foreign key rows referencing the deleted primary key are also deleted. For ON UPDATE, foreign key rows referencing the updated primary key are also updated. New in SQL Server 2005, if the primary key row is deleted, the foreign key referencing row(s) can also be set to NULL (assuming NULL values are allowed for that foreign key column). New in SQL Server 2005, if the primary key row is deleted, the foreign key referencing row(s) can also be set to a DEFAULT value. The new cascade SET DEFAULT option assumes the column has a default value set for a column. If not, and the column is nullable, a NULL value is set. The NOT FOR REPLICATION option is used to prevent foreign key constraints from being enforced by SQL Server Replication Agent processes (allowing data to arrive via replication potentially out-oforder from the primary key data).

In this example, a table is created using cascading options: CREATE TABLE Person.EmployeeEducationType( EmployeeEducationTypeID int NOT NULL PRIMARY KEY, EmployeeID int NOT NULL, EducationTypeID int NULL, CONSTRAINT FK_EmployeeEducationType_Employee FOREIGN KEY(EmployeeID) REFERENCES HumanResources.Employee(EmployeeID) ON DELETE CASCADE, CONSTRAINT FK_EmployeeEducationType_EducationType FOREIGN KEY(EducationTypeID) REFERENCES Person.EducationType(EducationTypeID) ON UPDATE SET NULL)

Before you can successfully build GCC, you need to make sure you have at least the minimum required versions of certain utilities installed on your system. These programs and utilities must be installed before you begin building GCC, otherwise the build won t work at all, or will fail at some point in the process. If you attempt to build GCC and discover that a required utility is missing, you should install the utility and then reconfigure GCC by running the make distclean command in your build directory and then follow the configuration instructions given in the sections of this chapter titled Configuring the Source Code and Additional Configuration Options. Building any GCC compiler requires that the following utilities be installed on your system: bash (or other POSIX-compliant shell) GNU binutils (2.16 or better) Bison (only necessary for building Subversion snapshots) DejaGNU (necessary for running the GCC test suite) Flex (only necessary for building Subversion snapshots) gcc (or any other C-90 compliant C compiler) GNAT (only necessary if building the GCC Ada compiler)