Question

I have a query and I am pulling down the results of Users matched to a country, this is my query so far:

SELECT
  UserColder.ContactName,
  CountryUser.[User ID],
  Country.Name,
  Country.ID
FROM
  dbo.Country
  INNER JOIN dbo.CountryUser
    ON Country.ID = CountryUser.[Foreign ID]
  INNER JOIN dbo.UserColder
    ON CountryUser.[User ID] = UserColder.ID

But what I want to do is make it so it only returns is a country has multiple User IDs to it. So if my data was.

Bob   United States
Tom   United States
Steve United Stated

Frank Canada
Billy Canada

Lou   China

I would want the results to be the

Bob
Tom
Steve

for the United States, and

Frank
Billy

for Canada, but not pull down China because it only has one user tied to it. But pull down the other because US and Canada have creater then 1 user tied to it. Would this be possible in a query?

Thanks!

Answer 1

I’m not sure of the syntax without the database in front of me, but the rank function would be good for this:

SELECT * FROM
(
SELECT
  UserColder.ContactName,
  CountryUser.[User ID],
  Country.Name,
  Country.ID,
  COUNT(UserColder.ContactName) OVER (PARTITION BY Country.ID) _RANK
FROM
  dbo.Country
  INNER JOIN dbo.CountryUser
    ON Country.ID = CountryUser.[Foreign ID]
  INNER JOIN dbo.UserColder
    ON CountryUser.[User ID] = UserColder.ID
) A
WHERE A._RANK > 1

Edited thanks to comments 🙂 Also added proof of concept:

SELECT * 
INTO #TEMP
FROM
(
SELECT 'UK' Country, 'Dave' Name
UNION
SELECT 'UK' Country, 'Bob' Name
UNION
SELECT 'UK' Country, 'Alex' Name
UNION
SELECT 'China' Country, 'Mike' Name
UNION
SELECT 'Holland' Country, 'Paul' Name
UNION
SELECT 'Holland' Country, 'James' Name
) A

SELECT * FROM #TEMP

SELECT * FROM
(SELECT Country, Name, Count(Name) OVER (PARTITION BY Country) _RANK FROM #TEMP) A
WHERE A._RANK > 1