Graphic design python turtle 🐢

By Kajal Vishwakarma -
from turtle import * import colorsys bgcolor('black') pensize(0) tracer(50) h=0 for i in range(300): c=colorsys.hsv_to_rgb(h,1,1) h+=0.9 color(c) forward(300) left(100) fd(i) goto(0,0) down() rt(90) begin_fill() circle(0) end_fill() rt(10) for j in range(5): rt(30) done() Please follow my blog and subscribe my channel for more videos and newly updates 👍👍👍👍👍 import turtle as t import colorsys t.bgcolor('black') t.tracer(100) h=0.4 def draw(ang,n): t.circle(5+n,60) t.left(ang) t.circle(5+n,60) for i in range(200): c=colorsys.hsv_to_rgb(h,1,1) h+=0.005 t.color(c) t.pensize(2) draw(90,i*2) draw(120,i*2.5) draw()
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Three Level Architecture of DBMS

By Kajal Vishwakarma -

What is Three Level Architecture of DBMS?

Three Level Architecture of DBMS:-

An early proposal for a standard terminology and general architecture database a system was Produced in 1971 by the DBTG (Data Base Task Group) appointed by the conference on data systems and languages.

DBTG recognized the need for a two level approach with a system view called the schema and user view called subschema.

There are following three level or layers of DBMS architecture:-

1) External Level

2) Conceptual Level

3) Internal Level


1) External Level:- it is also called "view level". The reason this level is called "view" is because several users can view their desired data from this level which is internally fetched from database with the help of conceptual and internal level mapping.

2) Conceptual Level:- It is also called logical level. The whole design of the database such as relationship among data schema of data etc are described in this level.

3) Internal Level:- This Level is also known as Physical Level. This level describes how the data is actually stored in storage devices. This level is also responsible for allocating space to the data. This is the lowest level of the architecture.


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