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A foreign key constraint is defined on the child table in a parent-child relationship The constraint nominates a column (or columns) in the child table that corresponds to the primary key column(s) in the parent table The columns do not have to have the same names, but they must be of the same data type Foreign key constraints define the relational structure of the database: the many-to-one relationships that connect the table, in their third normal form If the parent table has unique constraints as well as (or instead of) a primary key constraint, these columns can be used as the basis of foreign key constraints, even if they are nullable EXAM TIP A foreign key constraint is defined on the child table, but a unique or primary key constraint must already exist on the parent table Just as a unique constraint permits null values in the constrained column, so does a foreign key constraint You can insert rows into the child table with null foreign key columns even if there is not a row in the parent table with a null value This creates orphan rows and can cause dreadful confusion As a general rule, all the columns in a unique constraint and all the columns in a foreign key constraint are best defined with not-null constraints as well; this will often be a business requirement Attempting to insert a row in the child table for which there is no matching row in the parent table will give an error Similarly, deleting a row in the parent table will give an error if there are already rows referring to it in the child table There are two techniques for changing this behavior First, the constraint may be created as ON DELETE CASCADE This means that if a row in the parent table is deleted, Oracle will search the child table for all the matching rows and delete them too This will happen automatically A less drastic technique is to create the constraint as ON DELETE SET NULL In this case, if a row in the parent table is deleted, Oracle will search the child. rdlc pdf 417 PDF417 Barcode Creating Library for RDLC Reports | Generate ...
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NET web & IIS applications; Easy to draw & create 2D PDF - 417 barcode images in jpeg, gif, png and bitmap files; Able to generate & print PDF - 417 in RDLC ... table for all the matching rows and set the foreign key columns to null This means that the child rows will be orphaned but will still exist If the columns in the child table also have a not-null constraint, then the deletion from the parent table will fail It is not possible to drop or truncate the parent table in a foreign key relationship, even if there are no rows in the child table This still applies if the ON DELETE SET NULL or ON DELETE CASCADE clause was used A variation on the foreign key constraint is the self-referencing foreign key constraint This defines a condition where the parent and child rows exist in the same table An example would be a table of employees, which includes a column for the employee s manager The manager is himself an employee and must exist in the table So if the primary key is the EMPLOYEE_ID column, and the manager is identified by a column MANAGER_ID, then the foreign key constraint will state that the value of the MANAGER_ ID column must refer back to a valid EMPLOYEE_ID If an employee is his own manager, then the row would refer to itself rdlc pdf 417 PDF - 417 Client Report RDLC Generator | Using free sample for PDF ...
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Barcode Control SDK supports generating Data Matrix, QR Code, PDF - 417 barcodes in RDLC Local Report using VB and C# class library both in ASP.NET and ... A check constraint can be used to enforce simple rules, such as that the value entered in a column must be within a range of values The rule must be an expression that will evaluate to TRUE or FALSE The rules can refer to absolute values entered as literals, or to other columns in the same row, and they may make use of some functions As many check constraints as you want can be applied to one column, but it is not possible to use a subquery to evaluate whether a value is permissible, or to use functions such as SYSDATE TIP The not-null constraint is in fact implemented as a preconfigured check constraint Oracle Corporation s recommended sequence for starting a database is to start Database Control, then the database listener, and then the database Starting the database is itself a staged process There is no necessity to follow this sequence, and in more complex environments such as clustered systems or those managed by Enterprise Manager Grid Control there may well be additional processes too But this sequence will suffice for a simple single-instance environment
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