Answer: D) None of the above
Explanation: The subschema differs from the schema in that one denotes the appearance of data in the Database Base Management System (DBMS) while the subschema which is also referred to as the external schema is that subset of the schema is visible or relevant to the user. Thus, It is the view of the database which is visible to an application program. Virtual tables in a database usually represents an object structures like a table which is the result of running certain database commands or functions such as the create table, view, select and so on. Virtual tables are not stored directly in database files.
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The answer to (find the distance between the points (5,0) and (5,-6))
Answer:
As we know that wind flows from high pressure to low pressure.where the pressure is high then velocity of wind will be less and where pressure is low then velocity will be high.
In ITCZ (Intertropical Convergence Zone) where winds of two hemisphere are collides and this collision result in the rain in the India.
We know that ITCZ always follows the motion of sun that is why it varies seasonally.ITCZ is responsible for dry and wet season .
