计算姓氏和订购最常见的

Question

我们希望找到德国学生（NATIONALITY）最常见的姓氏（LNAME）。创建一个视图，对于每个德国姓氏，显示姓氏和具有该姓氏的学生人数。输出将按最常见到最不常见的顺序排序，次要排序顺序按字母顺序升序。

到目前为止，我有这个

CREATE VIEW GermanSurnames AS
SELECT LNAME, COUNT(LNAME)
FROM STUDENT
WHERE NATIONALITY = 'GERMAN'
ORDER BY LNAME DESC

这是正确的还是我应该怎么做？ 谢谢:)）

Answer 1

你错过了这个小组

SELECT LNAME, COUNT(*) as NUMSTUDENTS
FROM STUDENT
WHERE NATIONALITY = 'GERMAN'
GROUP BY LNAME
ORDER BY COUNT(*) DESC, LNAME

Answer 2

为什么要观看？不是

SELECT LNAME, COUNT(*) AS HOWMANY
  FROM STUDENT
 WHERE NATIONALITY = 'GERMAN'
 GROUP BY LNAME
 ORDER BY HOWMANY DESC;

足够？