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1488-C2090-616: DB2 11.1 Fundamentals for LUW
#Question
How does the TRUNCATE command differ from the DELETE command?
A.
TRUNCATE cannot be rolled back
B.
All of the above
C.
DELETE can be rolled back
D.
TRUNCATE is faster
Correct Answer:
B
TRUNCATE is faster, does not log individual row deletions, and cannot be rolled back, unlike DELETE.
#Question
What is the outcome of a SELECT statement without a WHERE clause?
A.
Returns all records
B.
Returns NULL
C.
Returns an error
D.
Returns no records
Correct Answer:
A
A SELECT statement without a WHERE clause returns all records from the selected table.
#Question
What does the term "data integrity" refer to in a database?
A.
Maintaining accuracy and consistency
B.
Increasing performance
C.
Backup and recovery
D.
Reducing data size
Correct Answer:
A
Data integrity refers to the accuracy and consistency of data stored in a database.
#Question
In DB2, what is the maximum number of indexes allowed per table?
A.
32
B.
Unlimited
C.
255
D.
64
Correct Answer:
C
DB2 limits the number of indexes on a single table to a maximum of 255.
#Question
What does the DB2 keyword "ISOLATION LEVEL" define?
A.
The size of a table
B.
The performance of a table
C.
The behavior of transactions regarding data visibility
D.
The structure of a database
Correct Answer:
C
ISOLATION LEVEL specifies how transaction integrity is visible to other transactions.
#Question
What is the function of the SQL COALESCE function?
A.
To concatenate strings
B.
To find the maximum value
C.
To return the first non-null value
D.
To find the minimum value
Correct Answer:
C
COALESCE returns the first non-null expression among its arguments.
#Question
How do you update multiple columns in a single UPDATE statement?
A.
Both of the above
B.
Use a single SET statement
C.
Neither
D.
Specify each column in SET
Correct Answer:
A
You can specify multiple columns in a single UPDATE statement by using a comma-separated list in the SET clause.
1488-C2090-616: DB2 11.1 Fundamentals for LUW
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