Getting minimum and maximum value from a table - SQL

Question

I have a table called country with a column called population. I need to get a table with only the highest and lowest population country. I have tried:

select max(population) from country;  

select min(population) from country;  

but I can't figure out how to combine these queries into only one query.

Best wishes!

Answer 1

select min(population), max(population) from country;

Will get you a result with two columns, the first holding the minimum population and the second the maximum population.

That only returns the populations though. If what you need is a query that will return the two countries, embedded queries would do :

select * from country where population=(select min(population) from country) or population=(select max(population) from country);

Answer 2

试试这个：

select country,min(population) from country
group by 1
Union
select country,max(population) from country
group by 1
order by 1;