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Compound SQL query

Compound SQL query

Compound SQL query


I'm just starting with SQL and have quite a basic question.

I have a table People with the following fields:
PersonID, Name, CountryID

Sample data:
1   Bob   4
2   Jim   5
3   Bill  5

A Countries table with the following fields:

CountryID, Name, ContinentID

Sample data:
4   USA   1
5   UK    2

And a Continents table with the following fields:
ContinentID, Name

Sample data:
1   North America
2   Europe

Now I want to submit a query that will return the names of all the people in Europe.

I was thinking that this would be along the lines of:


SELECT Name FROM People WHERE CountryID=(SELECT ContinentID FROM Countries WHERE ContinentID=2)

But this doesn't seem to work - where have I gone wrong? With my sample data above the query should return Jim and Bill.

Many, many thanks,


RE: Compound SQL query


SELECT People.Name
  FROM Continents
  JOIN Countries
    ON Countries.ContinentID = Continents.ContinentID
  JOIN People
    ON People.CountryID = Countries.ContinentID
 WHERE Continents.Name = 'Europe'

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