MOCKSTACKS
EN
Questions And Answers

More Tutorials









postgreSQL Aggregate Functions

Examples

Simple statistics: min(), max(), avg()


In order to determine some simple statistics of a value in a column of a table, you can use an aggregate function.
You could write this statement to get the minimum, maximum and average value:

SELECT min(age), max(age), avg(age)
FROM individuals;

string_agg(expression, delimiter)


You can concatenate strings separated by delimiter using the string_agg() function.

You could write SELECT ... GROUP BY statement to get names from each country:

SELECT string_agg(name, ', ') AS names, country
FROM individuals
GROUP BY country;

Note that you need to use a GROUP BY clause because string_agg() is an aggregate function.



Conclusion

In this page (written and validated by ) you learned about postgreSQL Aggregate Functions . What's Next? If you are interested in completing postgreSQL tutorial, your next topic will be learning about: postgreSQL regr slope Y X.



Incorrect info or code snippet? We take very seriously the accuracy of the information provided on our website. We also make sure to test all snippets and examples provided for each section. If you find any incorrect information, please send us an email about the issue: mockstacks@gmail.com.


Share On:


Mockstacks was launched to help beginners learn programming languages; the site is optimized with no Ads as, Ads might slow down the performance. We also don't track any personal information; we also don't collect any kind of data unless the user provided us a corrected information. Almost all examples have been tested. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. By using Mockstacks.com, you agree to have read and accepted our terms of use, cookies and privacy policy.