". VdoTips

APPLY LATEST GOVT JOBS

hi
Q.16 In tuple relational calculus P1 → P2 is equivalent to
(A). ¬P1 ∨ P2
(B). P1 ∨ P2
(C). P1 ∧ P2
(D). P1 ∧ ¬P2


Q.17 The language used in application programs to request data from the DBMS is referred to as the
(A). DML
(B). DDL
(C). VDL
(D). SDL


Q.18 A logical schema
(A). is the entire database.
(B). is a standard way of organizing information into accessible parts.
(C). describes how data is actually stored on disk.
(D). both
(A). and
(C).


Q.19 Related fields in a database are grouped to form a
(A). data file.
(B). data record.
(C). menu.
(D). bank.


Related data fields in a database are grouped to form a data record. (A record is a collection of related fields) Q.20 The database environment has all of the following components except:
(A). users.
(B). separate files.
(C). database.
(D). database administrator.