Question

I have a Name table with the columns
NameID
Name
TypeID

With the following SQL

SELECT[NameID]
FROM[Name]
WHERE[TypeID] = @TypeID
AND NameID >= (SELECT MIN([NameID]) 
               FROM [Name] 
               WHERE [Name]='Billy' AND [TypeID]=@TypeID)   

Ive been asked to convert this to an Inner Join without using any nested select but not sure how to.
thanks for your help!

Answer 1

Originally I didn’t think you needed a join at all,

;WITH n AS 
(
    SELECT
      NameID,
      rn = ROW_NUMBER() OVER (ORDER BY NameID)
    FROM [Name]
    WHERE TypeID = @TypeID
    AND [Name] = 'Billy'
)
SELECT NameID
    FROM n
    WHERE rn > 1;

Then again, maybe I do not have the requirements clear. What is the purpose of this query?

SELECT n1.NameID 
FROM [Name] AS n1
    INNER JOIN
(
    SELECT NameID = MIN(NameID) 
    FROM [Name]
    WHERE TypeID = @TypeID
    AND [Name] = 'Billy'
) AS n2
ON n1.NameID >= n2.NameID
WHERE n1.TypeID = @TypeID;

I agree with Lukas, I am not sure why the person who is telling you to change this thinks an inner join will be better than your original.