如何对COUNT个值求和

Question

我对SQLite还是很陌生，所以请原谅我问一些愚蠢的事情。从一个包含飞机数据表的数据库中，我可以使用现有查询对制造商数据中的记录进行计数：

SELECT Manufacturer, COUNT(Manufacturer) AS Number
FROM aircraft
WHERE Manufacturer like 'Airbus%'
GROUP BY Manufacturer
ORDER BY COUNT(Manufacturer) DESC;

这给了我

Manufacturer        Number
Airbus              3473
Airbus Military     29
Airbus Helicopters  2

是否有一种方法可以在不删除'GROUP BY'条款的情况下获得计算得出的总计（3504）？我无法使用SUM（）和TOTAL（）来工作。关于此计数汇总的问题似乎使用表中的值。

Answer 1

使用UNION ALL：

SELECT t.*
FROM (
  SELECT Manufacturer, COUNT(Manufacturer) AS Number
  FROM aircraft
  WHERE Manufacturer like 'Airbus%'
  GROUP BY Manufacturer
  UNION ALL
  SELECT 'Total', COUNT(Manufacturer)
  FROM aircraft
  WHERE Manufacturer like 'Airbus%'
) t
ORDER BY Manufacturer = 'Total', Number DESC

请参见demo。或使用CTE：

WITH cte AS (
  SELECT Manufacturer, COUNT(Manufacturer) AS Number
  FROM aircraft
  WHERE Manufacturer like 'Airbus%'
  GROUP BY Manufacturer  
)  
SELECT t.*
FROM (
  SELECT * FROM cte
  UNION ALL
  SELECT 'Total', SUM(Number) FROM cte
) t  
ORDER BY MAnufacturer = 'Total', Number DESC

请参见demo。