我想计算具有不同值的两列的行

Question

我有两列gender(values = 'Male' , 'Female') 和grade(values = 'senior officer' , 'Junior Officer')，表名是employee。我想计算所有担任高级军官的男性和所有担任初级军官的男性，反之亦然所有女性。下面是我的代码

''' SELECT staff_gender, staff_grade COUNT(*) 
    FROM permanent_staff 
    WHERE staff_gender='Female' AND staff_grade='senior officer' '''
 

Answer 1

聚合。

SELECT staff_gender, staff_grade
, COUNT(*) AS total
FROM permanent_staff
GROUP BY staff_gender, staff_grade
ORDER BY staff_gender, staff_grade