SQL commands classification

SQL commands can be classified into four groups :-

• DDL - Data Definition Language :
• CREATE - Creates new table, view of tables and other objects in database
• ALTER - Used to modify or change an existing  database objects such as tables.
• DROP - Used to  delete tables or views or other object in the database.

Illusions | Optical Illusions

Kaleidoscopic  Motion Illusion

Does it appears that the red portion is rotating clockwise and the blue portion is rotating counter clockwise.

But in actual the blue posting is absolutely  static.

Illusions | Optical Illusions

Tunnel  Vision

This illusion was created by Naia Nao. It seems that you are moving deep into the tunnel although the picture is absolutely static and not animated any way.

Static In Java

Static in java covers the followings:-

1. static variables
2. static methods
3. static blocks 

Illusions | Optical Illusions

Motion Induced Blindness

Stare at the blinking dot at the center of the image . you will began  to experience a motion induces blindness . The three yellow dots will disappear and reappear. In actual the yellow dots do not disappear at all.

Illusions | Optical Illusions

Spinning red strip

Stare at the image ,at first it seems that the red strip is spinning clockwise .Now focus on the black dot at the center suddenly it appears that  start moving in the counter clockwise direction.