1 原來我一直認爲視圖純粹是sql語句的集合，但是現在看來，視圖也是會被編譯的。直接看例子。
首先 我定義了視圖V_sh_MainInfoSub，代碼如下
CREATE view V_sh_MainInfoSub //主要是幾個表的聯合查詢，沒有什麼複雜的操作
as
select
m1.ma_id,
CONVERT(varchar(20), m1.ma_rep_datetime, 23) as ma_rep_datetime,
--(case ma_isOK when 1 then '已解決' when 2 then '待解決' else '未知' end) as 影響排序，暫時不用
m1.ma_isOK,
m1.ma_appear, m1.ma_link, d.dev_pos_detail,
(select i.item_info from sh_item i where i.item_order = d.dev_type
and i.item_type_name = 'dev_type' and item_valid = 1) as dev_type,
(select i.item_info from sh_item i where i.item_order = d.dev_spec
and i.item_type_name = 'dev_spec' and item_valid = 1) as dev_spec,
m1.ma_dev_GUID,--ma_dev_GUID和ma_order不用來顯示到頁面，
--當用戶更新MainInfo時，先通過id找到臨時表內容，然後通過ma_dev_GUID和ma_order找到sh_maintain的內容
m1.ma_order
from sh_maintain m1, sh_device d
where m1.ma_dev_GUID = d.dev_GUID
and d.dev_valid = 1
and m1.ma_valid = 1
2 然後定義視圖 V_sh_MainInfo 注意比上面的名字少了sub，內容如下
CREATE view V_sh_MainInfo //調用了V_sh_MainInfoSub 。主要功能是爲查詢結果動態創建連續的id號
as
select
(select count(*) from V_sh_MainInfoSub v2 where v2.ma_id <= v1.ma_id) as id,
* from V_sh_MainInfoSub v1
上面兩個視圖運行良好，沒有任何問題。
3 然後，由於需要，在sub視圖中增加了個別字段，修改之後的代碼如下
CREATE view V_sh_MainInfoSub //主要是幾個表的聯合查詢，沒有什麼複雜的操作
as
select
m1.ma_id,
CONVERT(varchar(20), m1.ma_rep_datetime, 23) as ma_rep_datetime,
--(case ma_isOK when 1 then '已解決' when 2 then '待解決' else '未知' end) as 影響排序，暫時不用
m1.ma_isOK,
m1.ma_appear, m1.ma_link, d.dev_pos_detail,
(select i.item_info from sh_item i where i.item_order = d.dev_type
and i.item_type_name = 'dev_type' and item_valid = 1) as dev_type,
(select i.item_info from sh_item i where i.item_order = d.dev_spec
and i.item_type_name = 'dev_spec' and item_valid = 1) as dev_spec,
m1.ma_dev_GUID,--ma_dev_GUID和ma_order不用來顯示到頁面，
--當用戶更新MainInfo時，先通過id找到臨時表內容，然後通過ma_dev_GUID和ma_order找到sh_maintain的內容
m1.ma_order,
p.province as dev_province,
c.city as dev_city,
a.area as dev_area
from sh_maintain m1, sh_device d, sh_province p, sh_city c, sh_area a
where m1.ma_dev_GUID = d.dev_GUID
and d.dev_valid = 1
and m1.ma_valid = 1
and p.provinceID = dev_province
and c.cityID = dev_city
and a.areaID = dev_area
and p.provinceID = c.father
and c.cityID = a.father
怪事出現了，單獨運行sub視圖沒問題，運行V_sh_MainInfo 裏面的語句也沒問題。注意是視圖裏的語句
select
(select count(*) from V_sh_MainInfoSub v2 where v2.ma_id <= v1.ma_id) as id,
* from V_sh_MainInfoSub v1
但是隻要運行 exec V_sh_MainInfo 就是看不到最後追加的三個字段dev_province ，dev_city，dev_area，
最後把V_sh_MainInfo 視圖刪除，重建，哎好了。
因此懷疑視圖也是經過了編譯了，以上是個人見解，歡迎批評指正