A. Rewrite the query select * from section natural join classroom without using a natural join...

A. Rewrite the query select * from section natural join classroom without using a natural join but instead using an inner join with a using condition.

B. Explain the difference between integrity constraints and authorization constraints.

Solutions

Expert Solution

Without "USING"

SELECT * FROM SECTION
INNER JOIN CLASSROOM
ON(SECTION.BUILDING = CLASSROOM.BUILDING
AND
SECTION.ROOM_NUMBER = SECTION.ROOM_NUMBER);

Explaining: Here we write the code with SQL code in this we code without using we rewrite the code

With "USING"

SELECT * FROM SECTION
INNER JOIN CLASSROOM
USING(BUILDING,ROOM_NUMBER);

Explaining: Here we write the code with SQL code in this we code with using we write the code.

Integrity Constraits:- It is Used to protect the data from being destroyed or damaged inside the database. Basically it is a set of proper Rules which ensure that Data Insertion, Updating, Retriveing and other similar process won't effect the Data Integrity.

Authorization constraints:- It is also known as Auth-Constraint. It basically contain role name element. And you are allowed to use multiple role name element as per the need. This constrait form a requirement for proper authentification and names the roles authorized to access the HTTP methods and the URL patterns declared by the Security Constarits

All The Best

venereology answered 1 year ago

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