Database Management Exam > Database Management Videos > Microsoft SQL for Beginners > SQL Tutorial - 52: Aggregate Functions (Part-2)
SQL Tutorial - 52: Aggregate Functions (Part-2) Video Lecture | Microsoft SQL for Beginners - Database Management
FAQs on SQL Tutorial - 52: Aggregate Functions (Part-2) Video Lecture - Microsoft SQL for Beginners - Database Management
| 1. What are aggregate functions in SQL? |  |
Ans. Aggregate functions in SQL are functions that perform calculations on a set of values and return a single value as the result. These functions are used to summarize data and perform operations such as counting, summing, averaging, finding the maximum or minimum value, etc.
| 2. How do I use aggregate functions in SQL queries? | |
Ans. To use aggregate functions in SQL queries, you need to specify the function name followed by parentheses and provide the column or expression on which the function should be applied. For example, to find the sum of a column, you can use the SUM() function like this: SELECT SUM(column_name) FROM table_name.
| 3. Can I use multiple aggregate functions in a single SQL query? | |
Ans. Yes, you can use multiple aggregate functions in a single SQL query. You can include multiple aggregate functions in the SELECT clause and specify different columns or expressions for each function. For example, you can find the sum, average, and count of different columns in a single query.
| 4. What is the difference between aggregate functions and regular functions in SQL? | |
Ans. The main difference between aggregate functions and regular functions in SQL is that aggregate functions operate on a set of values and return a single value as the result, whereas regular functions operate on a single value and can return multiple values or perform specific operations on that value.
| 5. Are aggregate functions only used in SELECT statements? | |
Ans. No, aggregate functions can be used in various clauses of SQL statements, not just in the SELECT clause. They can also be used in the HAVING and ORDER BY clauses to filter or sort the result set based on the aggregated values. Additionally, aggregate functions can be used in subqueries and even in combination with other functions or expressions.
Text Transcript from Video
hello guys welcome to my channel this is
the 50 second tutorial in this course in
this tutorial we are going to check out
two more aggregate functions the sum
function and the average function and
both the functions we've seen at least
once in the course before but again I'm
going to talk about them just a little
bit so that you know we are absolutely
clear with what these functions are used
for so the sum function as the name
suggests is used to some values for a
numeric field in a table right so I'll
just demonstrate how it works you type
in the Select keyword first and then the
name of function sum and let's say you
want to find out the sum of you know all
the salaries in the employee table so
within parentheses you type in the name
of the field which is salary and then on
the next line you get in the from
keyword and the name of the table which
is employee and when we execute the
query we see that the sum of all
salaries is three zero seven two zero
zero right so that's the amount and the
next one that we are going to check out
is the average function or the AVG
function and the AVG function is used to
find the average of a bunch of numeric
values that are returned and result set
so if you want to find out the average
age of all employees in your employee
table then you type in AVG and then
within parenthesis you type in the field
name which is age and then the from
keyword and then employee and when I
execute this query I see that the
average age of all employees is twenty
seven point nine four one two so that's
it for now this was going to be a short
tutorial and I hope you guys had fun
watching it and aggregate functions are
really very useful as you must have
figured out by now you know you
discussed four five in this course and
all of them are really nice so I hope
you guys you know have fun you know
checking out more applications of these
functions as you you know further
experiment with SQL and in the next
tutorial we are going to check out the
truncate table command and we see how
it's different from delete and thank you
so much for watching again and you may
subscribe to my channel and I'll see you
soon
the 50 second tutorial in this course in
this tutorial we are going to check out
two more aggregate functions the sum
function and the average function and
both the functions we've seen at least
once in the course before but again I'm
going to talk about them just a little
bit so that you know we are absolutely
clear with what these functions are used
for so the sum function as the name
suggests is used to some values for a
numeric field in a table right so I'll
just demonstrate how it works you type
in the Select keyword first and then the
name of function sum and let's say you
want to find out the sum of you know all
the salaries in the employee table so
within parentheses you type in the name
of the field which is salary and then on
the next line you get in the from
keyword and the name of the table which
is employee and when we execute the
query we see that the sum of all
salaries is three zero seven two zero
zero right so that's the amount and the
next one that we are going to check out
is the average function or the AVG
function and the AVG function is used to
find the average of a bunch of numeric
values that are returned and result set
so if you want to find out the average
age of all employees in your employee
table then you type in AVG and then
within parenthesis you type in the field
name which is age and then the from
keyword and then employee and when I
execute this query I see that the
average age of all employees is twenty
seven point nine four one two so that's
it for now this was going to be a short
tutorial and I hope you guys had fun
watching it and aggregate functions are
really very useful as you must have
figured out by now you know you
discussed four five in this course and
all of them are really nice so I hope
you guys you know have fun you know
checking out more applications of these
functions as you you know further
experiment with SQL and in the next
tutorial we are going to check out the
truncate table command and we see how
it's different from delete and thank you
so much for watching again and you may
subscribe to my channel and I'll see you
soon
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Nov 24, 2024 Last updated |
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