Using Stack Exchange Data Explorer (SEDE) to find users by post count and reputation

Question

I want to find out which users have the most reputation with the least amount of posts (less than 10). But why can't I have a where clause before this join? :

SELECT TOP 100 Users.Id, Users.DisplayName AS [Username], Users.Reputation, COUNT(Posts.Id) AS [Post Count] FROM Users
//WHERE COUNT(Posts.Id) < 10
JOIN Posts ON Posts.OwnerUserId = Users.Id 
GROUP BY Users.Id, Users.DisplayName, Users.Reputation
ORDER BY Users.Reputation DESC;

The original user post count example query is at data.stackexchange.com/stackoverflow/query/503051

Answer 1

That is what the HAVING clause (MS reference) is for.

You would use:

SELECT TOP 100 Users.Id, Users.DisplayName AS [Username], Users.Reputation, COUNT(Posts.Id) AS [Post Count] FROM Users
JOIN Posts ON Posts.OwnerUserId = Users.Id
GROUP BY Users.Id, Users.DisplayName, Users.Reputation
HAVING COUNT(Posts.Id) < 10
ORDER BY Users.Reputation DESC;

But here it is, leveraging a few SEDE features:

-- maxRows: How many rows to return:
-- maxPosts: Maximum number of posts a user can have:

SELECT TOP ##maxRows:INT?100##
            'site://u/' + CAST(u.Id AS NVARCHAR) + '|' + u.DisplayName  AS [User]
            , u.Reputation
            , COUNT (p.Id)  AS [Post Count]
FROM        Users u
LEFT JOIN   Posts p         ON (p.OwnerUserId = u.Id  AND  p.PostTypeId IN (1, 2) )  -- Q & A only
GROUP BY    u.Id
            , u.DisplayName
            , u.Reputation
HAVING      COUNT (p.Id) <= ##maxPosts:INT?10##
ORDER BY    u.Reputation DESC
            , [Post Count]
            , u.DisplayName

You can see it live in SEDE.

I particularly like the users with higher rep that have no posts.