DBI202 EXAM LATEST VERSION QUESTIONS WITH CORRECT ANSWERS (GRADED A+)
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DBI202
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DBI202
DBI202 EXAM LATEST VERSION QUESTIONS WITH CORRECT ANSWERS (GRADED A+)
Then, identify which of the following tuples is/are in the natural joinR|>< - Answer-S. You may assume each output tuple has schema (A.B.C.D)|(3.4.6.8) and (12.4.6)
Consider the following statement "When drawing ERD. ...
DBI202 EXAM LATEST
VERSION QUESTIONS
WITH CORRECT
ANSWERS (GRADED A+)
Then, identify which of the following tuples is/are in the natural joinR|>< - Answer-S.
You may assume each output tuple has schema (A.B.C.D)|(3.4.6.8) and (12.4.6)
Consider the following statement "When drawing ERD. you should avoid introducing
more elements into your design than necessary" That above statement describes which
principle? - Answer-Simplicity Count Principle
Compute the join of R and S with the condition: R.A < S.C AND R.B < S D Then,
identify from the list below all the tuples in the computed result (assume the schema of
the result is (A. R.B. S.B. C. D)): - Answer-(1.2.4.6.8) and (1.2.2.4.6)
Compute the right - outerjoin of R and S. where the condition is: R.B = S.B. Then
identify all the tuples of R that are not appear in the computed result - Answer-(5.6) and
(7.8)
Consider the following statement "When drawing ERD. if an entity has no non-key
attribute and it is the "one" in many-one relationship, then we should set r! to the
attribute of other entities" That above statement describes which principle? - Answer-
Picking the right kind of element principle
The LEN function in SQL Server is: - Answer-A scalar function
What is the meaning of the LEN function in SQL Server? - Answer-The LEN function
returns the total number of characters of a string
How to remove all trailing blanks - Answer-We can use the RTRIM function
The following is the syntax for the DATEDIFF function: DATEDIFF ( datepart, startdate ,
enddate ) The datepart parameter specifies on which part (day, month, year) of the date
to calculate the difference - Answer-true
How to remove all leading blanks? - Answer-We can use the LTRIM function
, What is the meaning of the ISNULL function? - Answer-The ISNULL function replaces
NULL with the BLANK value
Which of the following is in-correct? - Answer-SELECT datepart('1-jan-09', day)
How to convert a number to a string? - Answer-CONVERT, CAST function
What is the meaning of the DATEADD function? - Answer-The DATEADD function adds
an interval to a date you specify
The CASE function is used to Evaluates a list of conditions and returns one of multiple
possible result expressions - Answer-true
In SQL Server, an index is an on-disk structure associated with a table or view that
speeds up retrieval of rows from the table or view - Answer-true
Clustered index is not a good choice for the columns that undergo frequent changes -
Answer-true
A table or view must have a clustered indexe and some non-clustered indexes -
Answer-false
SQL Server typically selects the most efficient method when executing queries.
However, if no indexes are available. SQL Server must use a full table scan - Answer-
true
How many clustered index we can create in a table? - Answer-1
Indexes can be helpful for a variety of queries that contain SELECT, UPDATE, or
DELETE statements - Answer-true
In SQL Server, indexes are automatically created when PRIMARY KEY and UNIQUE
constraints are defined on table columns - Answer-true
Suppose we have a relation R(ABCD) with FD's: BC -> A ; AD -> C ; CD -> B ; BD -> C
- Answer-R is not in BCNF
Let R(A,B,C,D) with the following FDs: {AB->C, AC->B, AD->C} Choose a correct
statement about R - Answer-R is in 2NF
Given a R(A,B,C,D) with the following FDs: AB->D BC->A AD->B CD->B AD->C
Choose a correct statement about R: - Answer-The FD set of R is not canonical and R
is in BCNF
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