替代SQL语句WHERE条件中OR关键词

SQL语句，当WHERE条件需要搜索工号为16或工号为2的雇员姓名时，需用到OR关键词如：

SELECT [EmployeeName] FROM [Employee] WHERE [WorkNumber] = 16 OR [WorkNumber] = 2

但是，上面SQL语句会涉及效率与性能问题，因为重写上面SQL语句：

SELECT [EmployeeName] FROM [Employee] WHERE [WorkNumber] = 16
UNION ALL
SELECT [EmployeeName] FROM [Employee] WHERE [WorkNumber] = 2