替代SQL語句WHERE條件中OR關鍵詞

SQL語句，當WHERE條件需要搜尋工號為16或工號為2的僱員姓名時，需用到OR關鍵詞如：

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

但是，上面SQL語句會涉及效率與效能問題，因為重寫上面SQL語句：

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