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Taking these statements line by line: 1 The first table created is DEPT, intended to have one row for each department 2 DEPTNO is numeric, two digits, no decimals This is the table s primary key The constraint is named DEPT_DEPTNO_PK 3 A second constraint applied to DEPTNO is a check limiting it to numbers in the range 10 to 90 The constraint is named DEPT_DEPTNO_CK 4 The DNAME column is variable-length characters, with a constraint DEPT_DNAME_NN making it not nullable 5 The second table created is EMP, intended to have one row for every employee 6 EMPNO is numeric, up to four digits with no decimals Constraint EMP_ EMPNO_PK marks this as the table s primary key 7 ENAME is variable-length characters, with a constraint EMP_ENAME_NN making it not nullable 8 MGR is the employee s manager, who must himself be an employee The column is defined in the same way as the table s primary key column of EMPNO The constraint EMP_MGR_FK defines this column as a selfreferencing foreign key, so any value entered must refer to an already-extant row in EMP (though it is not constrained to be not null, so it can be left blank) 9 DOB, the employee s birthday, is a date and not constrained 10 HIREDATE is the date the employee was hired and is not constrained At least, not yet 11 DEPTNO is the department with which the employee is associated The column is defined in the same way as the DEPT table s primary key column of DEPTNO, and the constraint EMP_DEPTNO_FK enforces a foreign key relationship; it is not possible to assign an employee to a department that does not exist This is nullable, however 12 The EMP_DEPTO_FK constraint is further defined as ON DELETE SET NULL, so if the parent row in DEPT is deleted, all matching child rows in EMPNO will have DEPTNO set to NULL 13 EMAIL is variable-length character data and must be unique if entered (though it can be left empty).

unless (chroot("/users/martinb")) { warn "You are not root!\n" if ($>); die "Cannot change to root directory, $!"; }

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14 This defines an additional table level constraint EMP_HIREDATE_CK The constraint checks for use of child labor, by rejecting any rows where the date of hiring is not at least 16 years later than the birthday This constraint could not be defined in line with HIREDATE, because the syntax does not allow references to other columns at that point 15 An additional constraint EMP_EMAIL_CK is added to the EMAIL column, which makes two checks on the e-mail address The INSTR functions search for @ and characters (which will always be present in a valid e-mail address) and if it can t find both of them, the check condition will return FALSE and the row will be rejected The preceding examples show several possibilities for defining constraints at table creation time Further possibilities not covered include: Controlling the index creation for the unique and primary key constraints Defining whether the constraint should be checked at insert time (which it is by default) or later on, when the transaction is committed Stating whether the constraint is in fact being enforced at all (which is the default) or is disabled It is possible to create tables with no constraints and then to add them later with an ALTER TABLE command The end result will be the same, but this technique does make the code less self-documenting, as the complete table definition will then be spread over several statements rather than being in one

Most languages develop an expected idiom for expression. When dealing with C character strings, for example, the usual idiom involves pointer arithmetic rather than array references. C# hasn t been around long enough for programmers to have lots of experience in this area, but the .NET CLR has some guidelines you should consider. The Class Library Design Guidelines section in the .NET documentation details these guidelines, which are especially important for framework or library authors. The examples in this book conform to the guidelines, so they should be fairly familiar already. The .NET CLR classes and samples also have many examples.

You can only use the chroot function if you are root, and once set, there is no way to unset the root directory change (since all new references are relative to the previous

chroot function call) The effect is inherited both by the current function and by any children, including those generated by fork, implicitly or otherwise You can make a new directory using the mkdir function:

The stages are NOMOUNT, MOUNT, and OPEN NOMOUNT mode requires a parameter file MOUNT mode requires the controlfile OPEN mode requires the datafiles and online redo logfiles

The EXPR argument is the name of the directory you would like to create, with the permissions specified by the octal MODE If your operating system does not support a mkdir function within the C library, the command line mkdir program will be called, with EXPR as the argument; so be wary of creating a large number of directories with this function if this is the case Calling the external program puts extra overhead on the system, as it executes an additional program To remove a directory, use the rmdir function:

Static parameters cannot be changed without a shutdown/startup Other parameters can be changed dynamically, for the instance or a session Parameters can be seen in the dynamic performance views V$PARAMETER and V$SPPARAMETER

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