Lesson 33
Average Population | SQL Aggregation | HackerRank Solution
Video Transcript
Hey, I will do average population from the subsection aggregation of SQL in hacker rank
We're given the table city with the Collins ID country code district and population
We're asked to query the average population for all cities in a table city
Rounded down to the nearest integer
So I'm gonna use my SQL for this. Let's get started with select star from city
Now we're asked to get the average population. So instead of star, we're gonna work with population
That's the column right number of people in that city
So we have to take the average of all the cities that is we take all the values for a population
Add them up and then we divide that by the number of
Cities that we used in this case. There's a function AVG that we can use
So AVG of population will do that for us
Now round it down to the nearest integer if you want to ensure that
Rounded you can call the round function passing this AVG of population to round
parentheses AVG of population then you close the parentheses
Okay, since it's all the cities we don't have any filter with where and that's just like that. Oh, I had a
Additional parentheses there. Let me click submit code again
And
There you go. This is the average population for all cities
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