Technology Questions

The main reason why the scope resolution operator (::) cannot be overloaded is that only operators that take in values as parameters can be overloaded. The scope resolution operator does not take a value as parameter.

Windows object is top level object in Java script. It contains several other objects such as, document, history, location, name, menu bar etc., in itself. Window object is the global object for Java script that is written at client-side.

Information pertaining to the client browser and system is returned by the navigator object of JavaScript. Navigator object is the top level object for all users.

Some important differences between Canvas and SVG:

- Canvas is resolution dependent while SVG is not. 

- Canvas does not provide any support for event handlers while SVG does. 

- Canvas is suitable for graphic-intensive games while SVG is not suitable for gaming.

- Canvas is suitable for small rendering areas while SVG is suitable for large rendering areas like Google maps.

By using method.

The method used to set the data is called setter method.

JavaScripts uses a hierarchical structure that applies to the objects in a document. There are some objects that show the relationship of one object to another using the language.

Window object: This is the topmost object in the hierarchy. It represent the content area of browser window that consists of HTML documents. Each frame is also a window that has some actions inside it.

Document object: This object gets loaded in a window and consists of objects of different kind in the model. It consists of the content that will be written in the script.

Form object: Form objects are used for more interaction with the users. It represents the form elements inside <FORM>...</FORM> tag.

SQL Server is having a fantastic feature to retrieve data persisted in the form of XML format. The data in the XML format can be retrieved using FOR XML clause appending to the SELECT statement.

It offers 3 modes.

- “FOR XML AUTO": Returns XML elements that are nested, based on which tables are listed in the "from" part of the query, and which fields are listed in the "select" part.

- "FOR XML RAW": Returns XML elements with the "row" prefix (ex: ""). Each column in a table is represented as an attribute and null column values aren't included.

- "FOR XML EXPLICIT": Explicit mode is the most complex shaping method used in SQL Server 2000. It allows users to query a data source in such a way that the names and values of the returned XML are specified before the query batch is executed. 

FIND_GROUP(function) FIND_COLUMN(function)

New column can be added using the ALTER TABLE command as shown below:
Example:
ALTER TABLE employee ADD DateOfBirth date