What will happen,if we run below query?

Select Round(employee_name,0) from employee_master;

Here,column_name 'employee_name' is a Varchar(50) datatype in employee_master table.

It will throw an error saying that:-

Msg 8114, Level 16, State 5, Line 2
Error converting data type varchar to float.

Because employee_name is Varchar data type and Round function takes only Decimal,that's why it will throw an error.For working with this,take any Decimal column-name in 1st expression.