计数问题（）

Question

我想编写一个查询来从同一个表中检索COUNT(of employees with the salary=1000)和COUNT(of total no of employees)。 任何想法??

Answer 1

另一种方法：

SELECT
    COUNT(*) AS total_employees,
    SUM(CASE WHEN salary = 1000 THEN 1 ELSE 0 END) AS employees_with_1000_salary
FROM
    Employees

Answer 2

    SELECT COUNT(EmployeeID) as 'Total Employees',   
    (SELECT COUNT(EmployeeID) FROM Employees WHERE Salary = 1000) as 'Salaried'
    FROM Employees 

Answer 3

select 
     count(*) totalCount, 
     count(case when salary = 1000 then 1 else NULL end) specialCount
from Employees

COUNT计算非空行。

Answer 4

select count(*) as employeeCount,
(select count(*) from employee where salary=1000) as bigmoneyEmployeeCount
from employee