SQL查询计数和不同年份

Question

您好我正在尝试执行以下查询。基本上我试图统计1990年出生的所有音乐家。

SELECT COUNT(MusicianID), 
COUNT(DISTINCT CASE WHEN year(DateOfBirth)=1990)
FROM Musician

Answer 1

SELECT COUNT(MusicianID)
FROM Musician
WHERE YEAR(DateOfBirth)=1990

Answer 2

Select count(musicianid)
from musician
Where year(date of birth) = 1990

Answer 3

试试这个

 SELECT COUNT(MusicianID) As allmusicians
 FROM Musician
 WHERE year(DateOfBirth) = 1990

Answer 4

这将有效：

SELECT COUNT(MusicianID)
FROM Musician
WHERE YEAR(DateOfBirth)=1990