Can I combine a PIVOT with an Inner join in microsoft SQL server?

Question

Hi,

I have the following SQL query:

SELECT CountryID, [10201] AS CountryGDPPerCapita, [10677] AS LifeExpTotal
FROM
(
    SELECT CountryID,FieldID,numeric 
    FROM globaledge.dbo.DIBS_Data
    WHERE CountryID IN (3,5)
    AND FieldID IN (10201,10677)
    AND year = 2002
)  SourceTable
PIVOT
(
    MAX(numeric)
    FOR FieldID IN ([10201],[10677])
) AS PivotTable
ORDER BY PivotTable.CountryID

This returns something that looks like this:

CountryID CountryGDPPerCapita LifeExpTotal

3 35985.78 77.24

5 9147.7 74.54

Then I have another query as follows:

SELECT CountryName, CountryGDP, CountryGDPGrowth 
FROM globaledge.dbo.Country_Statistics 
WHERE CountryID IN (3,5) 
AND year=2002
Order By CountryName

Which produces the following:

CountryName CountryGDP CountryGDPGrowth

Mexico 1567000000000000 1.3

United States 14440000000000000 0.4

Also note, I do have CountryID in both tables, that refer to the same country. What I want is to create one SQL Query, maybe with an INNER JOIN, that would return the following:

CountryName CountryGDP CountryGDPGrowth CountryGDPPerCapita LifeExpTotal

Mexico 156700000000000000 1.3 35985.78 77.24

United States 144400000000000000 0.4 9147.7 74.54

Could anyone help me make this query? or tell me if it's possible?

Answer 1

Something like this would work:

SELECT 
  a.CountryID, a.CountryName, a.CountryGDP, a.CountryGDPGrowth 
, b.CountryGDPPerCapita, b.LifeExpTotal
FROM
(
    SELECT CountryID, CountryName, CountryGDP, CountryGDPGrowth 
    FROM globaledge.dbo.Country_Statistics 
    WHERE CountryID IN (3,5) 
    AND year=2002
) AS a
JOIN 
(
    SELECT CountryID, [10201] AS CountryGDPPerCapita, [10677] AS LifeExpTotal
    FROM
    (
        SELECT CountryID,FieldID,numeric 
        FROM globaledge.dbo.DIBS_Data
        WHERE CountryID IN (3,5)
        AND FieldID IN (10201,10677)
        AND year = 2002
    )  SourceTable
    PIVOT
    (
        MAX(numeric)
        FOR FieldID IN ([10201],[10677])
    ) AS PivotTable
) AS b ON a.CountryID = b.CountryID
Order By a.CountryName