sql - 如何将 2 列相乘？

Question

我正在对数据资源管理器进行查询：

SELECT
  Name,
  COUNT(*) Qty,
  Points = CASE Name
    WHEN 'Altruist' THEN 5
    WHEN 'Analytical' THEN 5
    WHEN 'Announcer' THEN 5
    WHEN 'Autobiographer' THEN 5
    WHEN 'Benefactor' THEN 5
    WHEN 'Caucus' THEN 5
    WHEN 'Citizen Patrol' THEN 5
    WHEN 'Cleanup' THEN 5
    WHEN 'Commentator' THEN 5
    WHEN 'Critic' THEN 5
    WHEN 'Custodian' THEN 5
    WHEN 'Disciplined' THEN 5
    WHEN 'Editor' THEN 5
    WHEN 'Excavator' THEN 5
    WHEN 'Informed' THEN 5
    WHEN 'Investor' THEN 5
    WHEN 'Mortarboard' THEN 5
    WHEN 'Nice Answer' THEN 5
    WHEN 'Nice Question' THEN 5
    WHEN 'Organizer' THEN 5
    WHEN 'Peer Pressure' THEN 5
    WHEN 'Popular Question' THEN 5
    WHEN 'Precognitive' THEN 5
    WHEN 'Promotor' THEN 5
    WHEN 'Proofreader' THEN 5
    WHEN 'Quorum' THEN 5
    WHEN 'Revival' THEN 5
    WHEN 'Scholar' THEN 5
    WHEN 'Self-Learner' THEN 5
    WHEN 'Student' THEN 5
    WHEN 'Suffrage' THEN 5
    WHEN 'Supporter' THEN 5
    WHEN 'Synonymizer' THEN 5
    WHEN 'Tag Editor' THEN 5
    WHEN 'Talkative' THEN 5
    WHEN 'Teacher' THEN 5
    WHEN 'Tumbleweed' THEN 5
    WHEN 'Vox Populi' THEN 5
    WHEN 'Archaeologist' THEN 10
    WHEN 'Beta' THEN 10
    WHEN 'Booster' THEN 10
    WHEN 'Civic Duty' THEN 10
    WHEN 'Constituent' THEN 10
    WHEN 'Convention' THEN 10
    WHEN 'Deputy' THEN 10
    WHEN 'Enlightened' THEN 10
    WHEN 'Enthusiast' THEN 10
    WHEN 'Epic' THEN 10
    WHEN 'Favorite Question' THEN 10
    WHEN 'Generalist' THEN 10
    WHEN 'Good Answer' THEN 10
    WHEN 'Good Question' THEN 10
    WHEN 'Guru' THEN 10
    WHEN 'Necromancer' THEN 10
    WHEN 'Notable Question' THEN 10
    WHEN 'Outspoken' THEN 10
    WHEN 'Pundit' THEN 10
    WHEN 'Research Assistant' THEN 10
    WHEN 'Reviewer' THEN 10
    WHEN 'Sportsmanship' THEN 10
    WHEN 'Strunk & White' THEN 10
    WHEN 'Taxonomist' THEN 10
    WHEN 'Tenacious' THEN 10
    WHEN 'Yearling' THEN 10
    WHEN 'Copy Editor' THEN 20
    WHEN 'Electorate' THEN 20
    WHEN 'Famous Question' THEN 20
    WHEN 'Fanatic' THEN 20
    WHEN 'Great Answer' THEN 20
    WHEN 'Great Question' THEN 20
    WHEN 'Legendary' THEN 20
    WHEN 'Marshal' THEN 20
    WHEN 'Populist' THEN 20
    WHEN 'Publicist' THEN 20
    WHEN 'Reversal' THEN 20
    WHEN 'Stellar Question' THEN 20
    WHEN 'Steward' THEN 20
    WHEN 'Unsung Hero' THEN 20
    ELSE 0
  END,
  Qty * Points AS Total
FROM Badges
WHERE UserId = 1563422
GROUP BY Name
ORDER BY COUNT(*) DESC

这一切都有效，除了何时, Qty * Points AS Total添加（从上面的查询中删除以成功运行查询）。

我得到的错误是：

列名“ ”无效Qty。

列名“ ”无效Points。

我怎样才能乘以Qty和Points作为Total？

Answer 1

使用子查询或像这样的CTE：

WITH CTE
AS
(
  SELECT
    Name,
    COUNT(*) Qty,
    Points = CASE Name
      WHEN 'Altruist' THEN 5
      WHEN 'Analytical' THEN 5
      WHEN 'Announcer' THEN 5
      WHEN 'Autobiographer' THEN 5
      WHEN 'Benefactor' THEN 5
      WHEN 'Caucus' THEN 5
      WHEN 'Citizen Patrol' THEN 5
      WHEN 'Cleanup' THEN 5
      WHEN 'Commentator' THEN 5
      WHEN 'Critic' THEN 5
      WHEN 'Custodian' THEN 5
      WHEN 'Disciplined' THEN 5
      WHEN 'Editor' THEN 5
      WHEN 'Excavator' THEN 5
      WHEN 'Informed' THEN 5
      WHEN 'Investor' THEN 5
      WHEN 'Mortarboard' THEN 5
      WHEN 'Nice Answer' THEN 5
      WHEN 'Nice Question' THEN 5
      WHEN 'Organizer' THEN 5
      WHEN 'Peer Pressure' THEN 5
      WHEN 'Popular Question' THEN 5
      WHEN 'Precognitive' THEN 5
      WHEN 'Promotor' THEN 5
      WHEN 'Proofreader' THEN 5
      WHEN 'Quorum' THEN 5
      WHEN 'Revival' THEN 5
      WHEN 'Scholar' THEN 5
      WHEN 'Self-Learner' THEN 5
      WHEN 'Student' THEN 5
      WHEN 'Suffrage' THEN 5
      WHEN 'Supporter' THEN 5
      WHEN 'Synonymizer' THEN 5
      WHEN 'Tag Editor' THEN 5
      WHEN 'Talkative' THEN 5
      WHEN 'Teacher' THEN 5
      WHEN 'Tumbleweed' THEN 5
      WHEN 'Vox Populi' THEN 5
      WHEN 'Archaeologist' THEN 10
      WHEN 'Beta' THEN 10
      WHEN 'Booster' THEN 10
      WHEN 'Civic Duty' THEN 10
      WHEN 'Constituent' THEN 10
      WHEN 'Convention' THEN 10
      WHEN 'Deputy' THEN 10
      WHEN 'Enlightened' THEN 10
      WHEN 'Enthusiast' THEN 10
      WHEN 'Epic' THEN 10
      WHEN 'Favorite Question' THEN 10
      WHEN 'Generalist' THEN 10
      WHEN 'Good Answer' THEN 10
      WHEN 'Good Question' THEN 10
      WHEN 'Guru' THEN 10
      WHEN 'Necromancer' THEN 10
      WHEN 'Notable Question' THEN 10
      WHEN 'Outspoken' THEN 10
      WHEN 'Pundit' THEN 10
      WHEN 'Research Assistant' THEN 10
      WHEN 'Reviewer' THEN 10
      WHEN 'Sportsmanship' THEN 10
      WHEN 'Strunk & White' THEN 10
      WHEN 'Taxonomist' THEN 10
      WHEN 'Tenacious' THEN 10
      WHEN 'Yearling' THEN 10
      WHEN 'Copy Editor' THEN 20
      WHEN 'Electorate' THEN 20
      WHEN 'Famous Question' THEN 20
      WHEN 'Fanatic' THEN 20
      WHEN 'Great Answer' THEN 20
      WHEN 'Great Question' THEN 20
      WHEN 'Legendary' THEN 20
      WHEN 'Marshal' THEN 20
      WHEN 'Populist' THEN 20
      WHEN 'Publicist' THEN 20
      WHEN 'Reversal' THEN 20
      WHEN 'Stellar Question' THEN 20
      WHEN 'Steward' THEN 20
      WHEN 'Unsung Hero' THEN 20
      ELSE 0
    END
  FROM Badges
  WHERE UserId = 1563422
  GROUP BY Name
  )
  SELECT *, QTY * Points AS Total
  FROM CTE;

更新了数据资源管理器上的演示