CREATE OR REPLACE VIEW
似乎在 SQL Server 中不起作用。那么如何移植CREATE OR REPLACE VIEW
到 SQL Server 上工作呢?
这就是我想要做的:
CREATE OR REPLACE VIEW data_VVVV AS
SELECT
VCV.xxxx,
VCV.yyyy AS yyyy,
VCV.zzzz AS zzzz
FROM
TABLE_A
;
有任何想法吗?
CREATE OR REPLACE VIEW
似乎在 SQL Server 中不起作用。那么如何移植CREATE OR REPLACE VIEW
到 SQL Server 上工作呢?
这就是我想要做的:
CREATE OR REPLACE VIEW data_VVVV AS
SELECT
VCV.xxxx,
VCV.yyyy AS yyyy,
VCV.zzzz AS zzzz
FROM
TABLE_A
;
有任何想法吗?
借用@Khan的回答,我会这样做:
IF OBJECT_ID('dbo.test_abc_def', 'V') IS NOT NULL
DROP VIEW dbo.test_abc_def
GO
CREATE VIEW dbo.test_abc_def AS
SELECT
VCV.xxxx
,VCV.yyyy AS yyyy
,VCV.zzzz AS zzzz
FROM TABLE_A
这是另一种方法,您不必复制视图的内容:
IF (NOT EXISTS (SELECT 1 FROM sys.views WHERE name = 'data_VVV'))
BEGIN
EXECUTE('CREATE VIEW data_VVVV as SELECT 1 as t');
END;
GO
ALTER VIEW data_VVVV AS
SELECT VCV.xxxx, VCV.yyyy AS yyyy, VCV.zzzz AS zzzz FROM TABLE_A ;
第一个检查视图是否存在(还有其他方法可以做到这一点)。如果它不存在,那么用一些简单而愚蠢的东西来创建它。如果是这样,那么只需继续alter view
声明即可。
使用 SQL Server 2016,您现在可以执行以下操作(MSDN Source):
DROP VIEW IF EXISTS dbo.MyView
或者(MSDN Source):
CREATE OR ALTER VIEW dbo.MyView
编辑:虽然这个问题已被标记为重复,但它仍然受到关注。@JaKXz 提供的答案是正确的,应该是公认的答案。
您需要检查视图是否存在。然后根据结果做一个CREATE VIEW
或。ALTER VIEW
IF OBJECT_ID('dbo.data_VVVV') IS NULL
BEGIN
CREATE VIEW dbo.data_VVVV
AS
SELECT VCV.xxxx, VCV.yyyy AS yyyy, VCV.zzzz AS zzzz FROM TABLE_A VCV
END
ELSE
ALTER VIEW dbo.data_VVVV
AS
SELECT VCV.xxxx, VCV.yyyy AS yyyy, VCV.zzzz AS zzzz FROM TABLE_A VCV
BEGIN
END
公认的解决方案存在需要两次维护相同语句的问题,它不是很有效(尽管它有效)。理论上 Gordon Linoff 的解决方案是可行的,但它在 MSSQL 中不起作用,因为 create view 必须是批处理中的第一行。
删除/创建没有回答提出的问题。以下根据原始问题完成工作。
if not exists (select * from sysobjects where name='TABLE_A' and xtype='V')
exec ('create view SELECT
VCV.xxxx,
VCV.yyyy AS yyyy,
VCV.zzzz AS zzzz
FROM TABLE_A')
这样的事情怎么样,评论应该解释:
--DJ - 2015-07-15 Example for view CREATE or REPLACE
--Replace with schema and view names
DECLARE @viewName NVARCHAR(30)= 'T';
DECLARE @schemaName NVARCHAR(30)= 'dbo';
--Leave this section as-is
BEGIN TRY
DECLARE @view AS NVARCHAR(100) = '
CREATE VIEW ' + @schemaName + '.' + @viewName + ' AS SELECT '''' AS [1]';
EXEC sp_executesql
@view;
END TRY
BEGIN CATCH
PRINT 'View already exists';
END CATCH;
GO
--Put full select statement here after modifying the view & schema name appropriately
ALTER VIEW [dbo].[T]
AS
SELECT '' AS [2];
GO
--Verify results with select statement against the view
SELECT *
FROM [T];
干杯-DJ
可以通过删除视图并重新创建它来更改视图。使用以下内容删除并重新创建您的视图。
IF EXISTS
(SELECT NAME FROM SYS.VIEWS WHERE NAME = 'dbo.test_abc_def')
DROP VIEW dbo.test_abc_def) go
CREATE VIEW dbo.test_abc_def AS
SELECT
VCV.xxxx,
VCV.yyyy AS yyyy
,VCV.zzzz AS zzzz
FROM TABLE_A
IF NOT EXISTS(select * FROM sys.views where name = 'data_VVVV ')
BEGIN
CREATE VIEW data_VVVV AS
SELECT VCV.xxxx, VCV.yyyy AS yyyy, VCV.zzzz AS zzzz FROM TABLE_A VCV
END
ELSE
BEGIN
ALTER VIEW data_VVVV AS
SELECT VCV.xxxx, VCV.yyyy AS yyyy, VCV.zzzz AS zzzz FROM TABLE_A VCV
END