SQL MAX of multiple columns?

Question

How do you return 1 value per row of the max of several columns:

TableName

[Number, Date1, Date2, Date3, Cost]

I n

Answer 1

Above table is an employee salary table with salary1,salary2,salary3,salary4 as columns.Query below will return the max value out of four columns

select  
 (select Max(salval) from( values (max(salary1)),(max(salary2)),(max(salary3)),(max(Salary4)))alias(salval)) as largest_val
 from EmployeeSalary

Running above query will give output as largest_val(10001)

Logic of above query is as below:

select Max(salvalue) from(values (10001),(5098),(6070),(7500))alias(salvalue)

output will be 10001