Technology Questions

Oracle NOT NULL is used on a column to ensure that the value for that column can never be NULL.
Example:
Below, the constraint is that the id should never be NULL. If it is, oracle throws an error.
create table employee ( id number NOT NULL, Name varchar(200) );

- SVG is the abbreviation for Scalable Vector Graphics and is recommended by W3C. 

- It is used to define vector-based graphics for the Web

- The graphics are defined in XML format

-An important quality of SVG graphics is that their quality is maintained even when they are zoomed or resized. 

- All the element and attributes of SVG files can be animated

An abstract class can have instance methods that implement a default behavior. An Interface can only declare constants and instance methods, but cannot implement default behavior and all methods are implicitly abstract. An interface has all public members and no implementation. An abstract class is a class which may have the usual flavors of class members (private, protected, etc.), but has some abstract methods.

-To store information usually relevant to browsers and search engines.

-To only store information usually relevant to browsers

-To only store information about search engines.

-To store information about external links

To send data/info to all of the members of the network..( simple 176.16.255.255 for class B network)

Anonymous class is class without name.

EX:

class A {

}

class Demo {

    A r = new A() {

        }; //anonymous class

}

strat_form using this we can open many layoutses
open_form using this we can open the layout
performance will be high