如何在列中获取不可为空的数据

Question

请参阅以下详细信息

当前输出：

EmpID   EmployeeDailyFee  EmployeeMonthlyFee  CompanyDailyFee  CompanyMonthlyFee
12      NULL              150                 NULL             NULL
12      120               NULL                NULL             NULL

预期产出：

EmpID   EmployeeDailyFee  EmployeeMonthlyFee  CompanyDailyFee  CompanyMonthlyFee
12      120               150                 NULL             NULL

请告诉我你的建议

Answer 1

如果您只为每位员工在每列中获得一个非空值，则可以尝试以下操作：

SELECT EmpID ,
       MAX(EmployeeDailyFee) AS EmployeeDailyFee,
       MAX(EmployeeMonthlyFee) AS EmployeeMonthlyFee, 
       MAX(CompanyDailyFee) AS CompanyDailyFee, 
       MAX(CompanyMonthlyFee) AS CompanyMonthlyFee
FROM Employees
GROUP BY EmpID