How to write a SQL statement which gets results via a relationship table? (many to many)

Question

I have 3 tables (archive has many sections, section (may) belong to many archives):

• archive

  • id PK
  • description

• archive_to_section

  • archive_id PK FK
  • section_id PK FK

• section

  • id PK
  • description

What would the SQL look like to list all the sections that belong a certain archive id?

I am just learning SQL. From what I've read it sounds like I would need a join, or union? FYI I'm using postgres.

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[Edit] This is the answer from gdean2323 written without aliases:

SELECT section.* 
FROM section 
INNER JOIN archive_to_section 
ON section.id = archive_to_section.section_id 
WHERE archive_to_section.archive_id = $this_archive_id

Answer 1

SELECT s.* 
FROM section s INNER JOIN archive_to_section ats ON s.id = ats.section_id 
WHERE ats.archive_id = 1

Answer 2

SELECT s.*
FROM archive_to_section ats
  INNER JOIN section s ON s.id=ats.section_id
WHERE ats.archive_id= @archiveID