關於sql server中，建視圖的語句中不能加order by的問題

今天寫了個SQL語句

select * from (

select ... from A? union ?select ...from B order by B.xx

) as Tmp

SQL查詢分析器中老是報錯：The ORDER BY clause is invalid in views, inline functions, derived tables, and subqueries, unless TOP is also specified.

而單獨執行select ... from A? union ?select ...from B order by B.xx語句時是可以的。

後來分析原因如下：

sql中建view是不能用order by字句的，即：

如果把該查詢語句建成視圖
? create view v_test
? as
? select * from sysobjects order by name
? 會提示出錯:
The ORDER BY clause is invalid in views, inline functions, derived tables, and subqueries, unless TOP is also specified.

而在嵌套查詢中，系統會自動爲select ... from A? union ?select ...from B order by B.xx語句建一個view，裏面有order by字句，當然會報錯了，去掉order by後，運行成功！