SQL4-Join/aggregate functions/group by

Quiz
•
Computers
•
University
•
Medium
M Ling
Used 52+ times
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19 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT a GROUP BY function?
MAX
MIN
NVL
AVG
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT a GROUP BY function?
MAX
MIN
NVL
AVG
3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Which of the following functions can be used without GROUP BY clause in SELECT query? (Select all that apply)
COUNT
MAX
MIN
AVG
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following SELECT query returns the department number with maximum salary compensated to an employee? (Consider the table structure as given)
SELECT department_id , max(salary ) FROM employees ;
SELECT department_id , max(salary ) FROM employees GROUP BY department_id ;
SELECT max(salary ) FROM employees GROUP BY department_id ;
SELECT max(salary ) FROM employees ;
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements are true about the COUNT function?
The COUNT function counts the number of rows
The COUNT(*) function counts the number of rows with duplicates and NULL values
The COUNT(DISTINCT) function counts the number of distinct rows
COUNT(*) is equivalent to COUNT(ALL)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the appropriate data types accepted by GROUP BY functions?
Nested Tables
NUMBER
CLOB
DATE
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A table T_COUNT has 12 number values as 1, 2, 3, 32, 1, 1, null, 24, 12, null, 32, null. Predict the output of the below query.
SELECT COUNT (num) FROM t_count;
12
6
9
Throws exception because COUNT function doesn't works with NULL values
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