[SQL Server] 常用sql脚本

1、添加表

GO

IF NOT EXISTS(SELECT * FROM sys.tables WHERE name='table_name')

BEGIN

CREATE TABLE [dbo].[table_name]()

END

GO

2、添加列

1）IF NOT EXISTS(SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('table_name') AND name = 'column_name')

AND EXISTS(SELECT * FROM sys.tables WHERE object_id = OBJECT_ID('table_name'))

BEGIN

ALTER TABLE table_name ADD column_name column_type

END

2) GO

IF(NOT EXISTS(SELECT * FROM sys.columns s WHERE s.name = 'column_name' AND s.id = OBJECT_ID('table_name')))

ALTER TABLE table_name ADD column_name column_type

GO

3、删除列

GO

IF EXISTS(SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('table_name') AND name = 'column_name')

BEGIN

ALTER TABLE table_name DROP COLUMN column_name

END

GO

4、表字段改名

GO

IF EXISTS (SELECT 1 FROM sys.columns WHERE [object_id] = OBJECT_ID('table_name') AND [name] = 'old_column_name')

BEGIN

EXEC sys.sp_rename @objname = 'table_name.old_column_name' @newname = 'new_column_name' @objtype = 'COLUMN'

END

GO

5、创建视图

IF EXISTS ( SELECT *

FROM sys.views

WHERE object_id = OBJECT_ID(N'[dbo].[VIEW_NAME]'))

DROP VIEW [dbo].[VIEW_NAME]

GO

CREATE VIEW [dbo].[VIEW_NAME]

AS

SELECT A.xx,

B.xx,

C.xx

FROM TABLE_A A

LEFT JOIN TABLE_B B ON B.xx = A.xx

LEFT JOIN TABLE_C C ON C.xx = A.xx

WHERE a.xx = xx

GO

6、创建函数

GO

IF OBJECT_ID(N'FUNCTION_NAME') IS NOT NULL

DROP FUNCTION FUNCTION_NAME

GO

CREATE FUNCTION [dbo].[FUNCTION_NAME] (@parameterIn parametertype)

RETURNS Returntype  --例如：RETURNS NVARCHAR(500)

AS

BEGIN

DECLARE @parameter parametertype

SET @parameter = (SELECT COLUMN FROM TABLE WHERE COLUMN = @parameterIn)

RETURN @parameter

END

GO

调用函数 SELECT [dbo].[FUNCTION_NAME] (parameterIn)

7、修改字段的类型

GO

IF EXISTS (SELECT 1 FROM sys.columns WHERE [object_id] = OBJECT_ID('table_name') AND [name] = 'column_name')

BEGIN

ALTER TABLE table_name ALTER COLUMN column_name type

END

GO