MySQL COUNT(),SUM()和GROUP BY

Question

我有一个关于MySQL的特殊问题.请查看下面的查询和结果集:

SELECT COUNT(c.Population) AS c, c.City AS cc
FROM City c
GROUP BY c.City
ORDER BY c.City;

261 | Bristol
----------------
910 | London
----------------
241 | Manchester
----------------

我想得到COUNTs的SUM,所以在这种情况下我想在下一行或新列中看到'1412',这并不重要.

有什么建议？我试图对此应用子查询,但我找不到合适的解决方案.

干杯

Answer 1

请问WITH ROLLUP你需要什么？

SELECT 
      COUNT(c.Population) AS c, 
      c.City AS cc 
FROM City c 
GROUP BY c.City 
WITH ROLLUP;

Answer 2

在select语句中,这应该工作(未经测试).

SELECT 
    COUNT(c.Population) AS c, 
    c.City AS cc, 
    (SELECT COUNT(c.Population) FROM City) as TotalPop 
FROM City c 
GROUP BY c.City 
ORDER BY c.City;