## How to do the problem with group by when solving a problem?

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I was doing problems at SQLZoo and got stuck at question 7, they have provided solution using nested query but how do I do this with group by? Link to the problem: https://sqlzoo.net/wiki/SELECT_within_SELECT_Tutorial

I tried this

```select continent, name, area
from world
where area = (select max(area) from world
group by continent);
```

But the response come as 'Subquery returns more than 1 row'

If you want to use the `=` operator you need a co-related subquery to make sure that only a single row is returned:

```select w1.continent, w1.name, w1.area
from world w1
where w1.area = (select max(w2.area)
from world w2
where w2.continent = w1.continent);
```

Another option is to use the IN operator with two columns then you can keep the `group by` in the sub-select.

```select continent, name, area
from world
where (continent, area) IN (select continent, max(area)
from world
group by continent);
```

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Try this

```select continent, name, area
from world
where area IN (select max(area) from world
group by continent);
```

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You can use window function to number rows grouped by continent descending by area.

```select continent, name, area
from (
select
continent,
name,
area,
row_number() over (partition by continent order by area desc) as rn
from world ) world
where world.rn = 1
```

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