WITH UnregisteredUsers AS ( SELECT Id, Reputation FROM Us...

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WITH UnregisteredUsers AS
(
  SELECT Id, Reputation
  FROM Users
  --WHERE DisplayName IS NULL
),
AverageReputation AS
(
  SELECT AVG(CAST(Reputation AS Float)) AS AvgRep
  FROM UnregisteredUsers
),
AverageScores AS
(
  SELECT
    SUM(CASE WHEN p.PostTypeId = 1 THEN 1 ELSE 0 END) / CAST(COUNT(DISTINCT u.Id) AS Float) AS AvgQuestionCount,
    AVG(CASE WHEN p.PostTypeId = 1 THEN CAST(p.Score AS float) ELSE 0 END) AS AvgQuestionScore,
    SUM(CASE WHEN p.PostTypeId = 2 THEN 1 ELSE 0 END) / CAST(COUNT(DISTINCT u.Id) AS Float) AS AvgAnswerCount,
    AVG(CASE WHEN p.PostTypeId = 2 THEN CAST(p.Score AS float) ELSE 0 END) AS AvgAnswerScore
  FROM UnregisteredUsers u
  INNER JOIN Posts p
    ON p.OwnerUserId = u.Id
)
SELECT *
FROM AverageReputation
CROSS JOIN AverageScores

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