SQL SERVER 视图
视图
SET NOCOUNT ON;
SET Northwind;
GO
IF OBJECT_ID('dbo.ViewName') IS NOT NULL
DROP VIEW dbo.ViewName;
GO
CREATE VIEW dbo.Viewname
AS
SELECT * FROM customer AS C
WHERE EXISTS
(SELECT * FROM dbo.Orders AS O
WHERE O.CustomerID = C.Customerid);
GO
**************************我是分割线**************************
IF OBJECT_ID('abo.VSign') IS NOT NULL
DROP VIEW ado.VSign;
GO
CREATE VIEW ado.VSign
AS
SELECT mnth, qty, SIGN((S1.qty-(SELECT TOP 1 qty FROM ado.Sales AS S2
WHERE S2.mnth < S1.mnth ORDER BY S2.mnth DESC))) AS sgn
FROM ado.Sales AS S1
GO
************************** 我是分割线**************************
刷新视图
EXEC sp_refreshview 'dbo.V1';
SELECT NEXEC sp_refreshview QUOTENAME(VIEW_NAME, '');
SELECT NEXEC sp_refreshview QUOTENAME(VIEW_NAME, '"') AS cmd
FROM(SELECT QUOTENAME(TABLE_SCHEMA) N, QUOTENAME(TABLE_NAME) AS VIEW_NAME
FROM INFORMATION_SCHEMA, VIEWS) AS V
WHERE OBJECT PROPERTY(OBJECT_ID(VIEW_NAME), 'IsSchemaBound') = 0;
视图中的ORDER BY（必须与TOP和FORXML一起使用）
注：不要依赖于视图的ORDER BY（2000可用，2005不可用）
EXISTS中的*可以用，只起统计作用。
SQLSERVER2005支持CTE，使用模块化方法开发。
************************** 我是分割线**************************
ALTER VIEW dbo.Vtrends
AS
WITH CsalesRN AS
(SELECT mnth, qty, ROW_NUMBER() OVER(ORDER BY mnth) AS RN
FROM dbo.sales),
CSign AS
(SELECT Cur.mnth, Cur.qty, SIGN(Cur.qty - Prv.qty) AS Sign
FROM CsalesRN AS Cur
LEFT OUTER JOIN CsalesRN AS Prv ON Cur.rn = Prv.rn + 1),
CGrp AS
(SELECT mnth, sgn, DATEADD(month, ROW_NUMBER() OVER(PARTITION BY sign ORDER BY mnth), mnth) AS grp
FROM CSgn),
SELECT CONVERT(VARCHAR(6), MIN(mnth), 112) AS start
CONVERT(VARCHAR(6), MIN(mnth), 112) AS end
CASE Sign
WHEN -1 THEN 'down'
WHEN 0 THEN 'same'
WHEN 1 THEN 'up'
ELSE 'unknown'
END AS trend
FROM CGrp
GROUP BY sgn, grp;
GO