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Consider the relations given below Borrower (id_no, name)Book (accno., title, author, borrower_idno) (a) Define the above relations as tables in SQL forming real world assumptions about the kind of the fields. Define the primary keys and the foreign keys. (b) For the above relations answer the subsequent queries in SQL What are the titles of the books borrowed through the borrower whose id-no in 365.(i) Find out the numbers and names of borrowers who have borrowed books on DBMS in ascending order in id_no.(ii) List the names of borrowers who have borrowed at least two books.
a) Create table Book (Accno int Primary Key, title char(30), author char(30), borrow-idno int references Borrower_id.no ); Create table borrower (id-no int Primary Key, name char(30) ); b) (i) Select title from Book, Borrower where Borrower.id_no =Book.borrower-idno and borrower.id_no = 365 (ii) Select id_no, name from Borrower, Book where Borrower.id_no= Book.borrower_idno and title= ‘DBMS' order by id_no asc; (iii) Select name from Borrower, Book where Borrower.id_no = book.borrower_id_no having count (*) > 2
When is UPDATE_STATISTICS command used? - When processing of large data is done, this command is used. - Whenever large number of modification, deletions or copy takes place
a publishing company produce scientific books on various subjects. the books are written by authors who specialize in one particular subject. the company employs editors who, not n
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appea
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
What is horizontal fragmentation? Horizontal fragmentation divides the relation by assuming every tuple of r to one or more fragments
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Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
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When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be
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