How to do this query in SQL?

Use a subquery in the WHERE clause to retrieve boat names from the voyages table where there is no matching entry in the invoices table for the particular voyage number. Use a subquery with either NOT IN or NOT EXISTS (with a reference to the outer query).

Could someone help me with this?

This is the invoices table:

#	number	invoice	chamber
1	8300	9189	A

This is the voyages table:

#	number	boatname	master	tonnage	type_of_boat	built	chamber	departure_date	departure_harbour	next_voyage
1	8300	FAAM	Luur Runken	136	paketboot	1788	A	1759	Batavia	8365