SQL：为另一列选择不同的值

Question

I'm trying to determine how many unique values from one column can be grouped by values in another column.

There are many columns in my sheet, but the ones I'm interested in are: 'department' and 'user'

How the data is that for these two columns, there are repeat users with the same department.

Eg.

Department    User

Insights      Mike

Insights      Mike

Insights      Chris

Market        Julie

Research      Will

Research      Sabrina

Research      Bryan

What I would want is the following:

Department    DistinctUsers

Insights       2

Market         1

Research       3

My basic SQL knowledge tells me this is the structure of the code:

SELECT department, COUNT(DISTINCT user) 
FROM Sheet1
GROUP BY department, user

I have seen that people would implement (SELECT DISTINCT User from Sheet1) in the FROM clause, but I have failed to integrate that into the code.

Any suggestions or tips is much appreciated!

Thanks!

Answer 1

As mentioned in the comments, you just need to remove users from the group by.

SELECT 
   department, 
   COUNT(DISTINCT [user]) as CT
FROM Sheet1
GROUP BY department

ACCESS

SELECT
   department,
   count([user])
FROM
   (SELECT DISTINCT department, [user] from Sheet1) as x
GROUP BY
   department

Answer 2

您的代码即可完成工作，但无需按用户分组

Answer 3

BEGIN TRAN

CREATE TABLE #TMP (Department  NVARCHAR(50),Name NVARCHAR(50))

INSERT INTO #TMP
SELECT 'Insights', 'Mike' UNION ALL

SELECT 'Insights','Mike' UNION ALL

SELECT 'Insights','Chris'UNION ALL

SELECT 'Market'   ,'Julie' UNION ALL

SELECT 'Research',  'Will'UNION ALL

SELECT  'Research', 'Sabrina'UNION ALL

SELECT  'Research','Bryan'

SELECT * FROM #TMP

SELECT department, COUNT(DISTINCT NAME) 
FROM #TMP
GROUP BY department

ROLLBACK TRAN