> For the complete documentation index, see [llms.txt](https://metis-montessori-lyceum.gitbook.io/sql-0/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://metis-montessori-lyceum.gitbook.io/sql-0/6-subqueries/antwoorden.md).

# Antwoorden

**Opdracht 6.1**

Wat is de naam van de track die het langste duurt?

```sql
select name 
from Track 
where Milliseconds = (
    select max(Milliseconds) 
    from Track);
```

#### Opdracht 6.2

Wat is de naam van de track die het kortste duurt?

```sql
select name 
from Track 
where Milliseconds = (
    select min(Milliseconds) 
    from Track);
```

**Opdracht 6.3**

Welke albums zijn nog nooit verkocht?

```sql
select name 
from track
where trackid not in (
    select t.trackid
    from Track as T, InvoiceLine as I
    where t.trackid = I.trackid);
```

#### Opdracht 6.4

Wat is de duurste bestelling ooit geweest? 

```sql
select invoiceID, sum(UnitPrice * Quantity) 
from InvoiceLine 
group by InvoiceID 
order by sum(UnitPrice  * Quantity) 
desc Limit 1;
```

#### Opdracht 6.5

Welke klant heeft dat besteld?

```sql
select DISTINCT Customer.firstname, customer.lastname
from customer, Invoice, Invoiceline
where Customer.CustomerID = Invoice.CustomerID AND
    Invoice.InvoiceID = (
        select invoiceID
        from InvoiceLine 
        group by InvoiceID 
        order by sum(UnitPrice  * Quantity) 
        desc Limit 1);
```


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