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Question
Site any two differences between Single Row Functions and Aggregate Functions.
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Solution
| Single Row Functions | Aggregate Functions |
| Single row functions operate on individual rows and return a single value per row. | Aggregate functions operate on groups of rows and return a single result for each group. |
| It can be used in SELECT, WHERE, and ORDER BY clause. | It can be used in the SELECT clause only. |
UPPER(name) → Converts each name to uppercase |
SUM(salary) → Returns total salary for all or a group of employees |
RELATED QUESTIONS
Which of the following belongs to an "aggregate function"?
Consider the table STUDENT given below:
| RollNo | Name | Class | DOB | Gender | City | Marks |
| 1 | Anand | XI | 6/6/97 | M | Agra | 430 |
| 2 | Chetan | XII | 7/5/94 | M | Mumbai | 460 |
| 3 | Geet | XI | 6/5/97 | F | Agra | 470 |
| 4 | Preeti | XII | 8/8/95 | F | Mumbai | 492 |
| 5 | Saniyal | XII | 8/10/95 | M | Delhi | 360 |
| 6 | Maakhiy | XI | 12/12/94 | F | Dubai | 256 |
| 7 | Neha | X | 8/12/95 | F | Moscow | 324 |
| 8 | Nishant | X | 12/6/95 | M | Moscow | 429 |
State the command that will give the output as:
| Name |
| Anand |
| Chetan |
| Geet |
| Preeti |
(i) select Name from student where Class ='XI' and Class='XII';
(ii) select name from student where not Class='XI' and Class='XII';
(iii) select name from student where City="Agra" or City="Mumbai";
(iv) select name from student where City in("Agra", "Mumbai");
Choose the correct option:
Identify Single Row function of MySQL among the following.
What will be returned by the given query? select mid("Computer", 2, 4) = ______.
What will be returned by the given query? SELECT RIGHT("LEFT", 2) = ______.
What will be returned by the given query? SELECT MID('LeaminglsFun', 2, 4) = ______.
Name a function of MySQL which is used to remove trailing and leading spaces from a string.
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To display the specified number of characters from a particular position of the given string.
Write the name of the functions to perform the following operation:
To display the name of the month in which you were born.
Write the output produced by the following SQL statement:
SELECT LENGTH("Informatics Practices");
Write the output produced by the following SQL statement:
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Predict the output of the code given below:
s="welcome2cs"
n = len(s)
m=""
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m = m +s[i].upper()
elif (s[i] >= 'n' and s[i] <= 'z'):
m = m +s[i-1]
elif (s[i].isupper()):
m = m + s[i].lower()
else:
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SELECT SUM (DISTINCT Fees) FROM student;
In SQL, which function is used to display the current date and time?
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| TABLE: PURCHASE | ||||
| CNO | CNAME | CITY | QUANTITY | DOP |
| C01 | GURPREET | NEW DELHI | 150 | 2022-06-11 |
| C02 | MALIKA | HYDERABAD | 10 | 2022-02-19 |
| C03 | NADAR | DALHOUSIE | 100 | 2021-12-04 |
| C04 | SAHIB | CHANDIGARH | 50 | 2021-10-10 |
| C05 | MEHAK | CHANDIGARH | 15 | 2021-10-20 |
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- SELECT CNAME FROM PURCHASE WHERE MONTH(DOP) = 3;
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Based on the table STUDENT given here, write suitable SQL queries for the following:
| Roll No | Name | Class | Gender | City | Marks |
| 1 | Abhishek | XI | M | Agra | 430 |
| 2 | Prateek | XII | M | Mumbai | 440 |
| 3 | Sneha | XI | F | Agra | 470 |
| 4 | Nancy | XII | F | Mumbai | 492 |
| 5 | Himanshu | XII | M | Delhi | 360 |
| 6 | Anchal | XI | F | Dubai | 256 |
| 7 | Mehar | X | F | Moscow | 324 |
| 8 | Nishant | X | M | Moscow | 429 |
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- Display city-wise lowest marks.
- Display the total number of male and female students.
Write suitable SQL query for the following:
Round off the value 23.78 to one decimal place.
Write suitable SQL query for the following:
Remove all the expected leading and trailing spaces from a column userid of the table ‘USERS’.
Explain the following SQL function using a suitable example.
UCASE()
Explain the following SQL function using a suitable example.
MID()
Explain the following SQL function using a suitable example.
DAYNAME()
Which function returns the sum of all elements of a list?
