Q. The student marks should not be greater than 100. This is

View solution

Q. Usage of Preemption and Transaction Rollback prevents ..................

View solution

Q. Views are useful for ................. unwanted information, and for collecting together information from more than one relation into a single view.

View solution

Q. Cross_tab displays permit users to view ................ of multidimensional data at a time.

View solution

Q. Thoma’s-write rule is .................

View solution

Q. .................. constraints ensure that a value that appears in one relation for a given set of attributes also appears for a certain set of attributes in another relation.

View solution

Q. The SQL expression

Select distinct T, branch_name from branch T, branch S where T.assets>S.assets and S.branch_city=”Mumbai”

finds the names of

View solution

Q. Consider the following schemas :

Branch_Schema = (branch_name, assets, city)
Customer_Schema = (cutstomer_name, street, city)
Deposit_Schema = (branch_name, account_number, customer_name, balance)
Borrow_Schema = (branch_name, loan_number, customer_name, amount)

Which of the following tuple relational calculus finds all customers who have loan amount more than Rs 12,000 ?

View solution

Q. Match the following :

(a) Create          (i) The E-R Model
(b) Select           (ii) Relationship Model
(c) Rectangle    (iii) DDL
(d) Record         (iv) DML

Codes :
      (a)   (b)  (c)  (d)

View solution

Q. Which of the following is not a type of Database Management System?

View solution

Q. Manager's salary details are to be hidden from Employee Table. This Technique is called as

View solution

Q. A Network Schema

View solution

Q. Which normal form is considered as adequate for usual database design?

View solution

Q. If D1, D2,…. Dn are domains in a relational model, then the relation is a table, which is a subset of

View solution

Q. Given an open address hash table with load factor a < 1, the expected number of probes in a successful search is

View solution

Q. The “PROJECT” operator of a relational algebra creates a new table that has always

View solution

Q. The employee information of an Organization is stored in the relation:

Employee (name, sex, salary, deptname)

Consider the following SQL query

Select deptname from Employee Where sex = ‘M’ group by deptname having avg (salary) > {select avg (salary) from Employee}

Output of the given query corresponds to

View solution

Q. For a database relation R(a, b, c, d) where the domains of a, b, c, d include only the atomic values. The functional dependency a → c, b → d holds in the following relation

View solution

Q. Match the following:

a. Foreign keys                                  i. Domain constraint
b. Private key                                     ii. Referential integrity
c. Event control action model         iii. Encryption
d. Data security                                 iv. Trigger

Codes:
      a   b   c   d

View solution

Q. In multiuser database if two users wish to update the same record at the same time, they are prevented from doing so by

View solution