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Describe the definition of a transaction in SQL
Ans: The SQL transaction starts implicitly. Transactions are finished by either Commit work that commits the transaction and starts a new one Rollback work that causes the transaction to abort.
If a program ends without either of these statements after that updates are either committed or rolled back and the selection is implementation dependent.
Describe how you can simplify Operations. To simplify operation, one should use inheritance, where possible to use, to reduce the quantity of distinct operations. Introduce new
Explain Domain calculus Domain calculus is one of the types of the relational calculus. The formal specification of the domain calculus was planned after the development of the
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Define Physical and Logical independence Ans: Physical data independence: The ability to modify physical level without causing application program to be rewritten. Logic
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
entity relationship diagram about finance
What is first normal form? The domain of attribute must contain only atomic (simple, indivisible) values.
What is entity in DBMS? Entity: A DBMS entity is either a thing in the modelled world or a drawing element in an ERD.
Question 1 Discuss on transmission impairments Question 2 What is framing? Question 3 Write a note on 10Base2 10Base- T Question 4 Explain the rev
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