SQL规范化的数据修改语句

保存一些标准的SQL句，持续更新...

1 列修改

增加列

IF NOT EXISTS (SELECT *  FROM  SYSCOLUMNS WHERE ID=OBJECT_ID('QueryDataSource') and name = 'IsCrossTable')
 BEGIN
    ALTER TABLE QueryDataSource ADD IsCrossTable bit default(0) --插入字段
 END

删除列

ALTER TABLE AC_TYPE  DROP COLUMN ACCATEGORY_ID,ACCATEGORY_GUID;

修改列

 alter table ACREG_LICENSE alter column [DOCUMENTGUID] uniqueidentifier null;

2 存储过程

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[PLSystem_Insert]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[PLSystem_Insert]
go

CREATE PROCEDURE  dbo.PLSystem_Insert 
(
 @PLSystemID smallint, 
 @PLSystemName varchar(20), 
 @PLSystemFlag char(2)
)
AS
INSERT INTO  dbo.PLSystem
(
 PLSystemID, 
 PLSystemName, 
 PLSystemFlag
)
VALUES
(
 @PLSystemID, 
 @PLSystemName, 
 @PLSystemFlag
)
 
go


if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[PLSystem_Delete]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[PLSystem_Delete]
go

CREATE PROCEDURE  dbo.PLSystem_Delete 
(
@PLSystemID smallint
)
AS

DELETE FROM   dbo.PLSystem 
WHERE 
PLSystemID = @PLSystemID
go


if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[PLSystem_Update]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[PLSystem_Update]
go

CREATE PROCEDURE  dbo.PLSystem_Update 
(
@PLSystemID smallint, 
@PLSystemName varchar(20), 
@PLSystemFlag char(2)
)
AS
UPDATE  dbo.PLSystem SET
PLSystemName = @PLSystemName, 
PLSystemFlag = @PLSystemFlag
WHERE 
PLSystemID = @PLSystemID 
go

3 创建表

IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[PLSystem]') AND type in (N'U'))
DROP TABLE [dbo].[PLSystem]
GO

IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[PLSystem]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[PLSystem](
    [PLSystemID] [tinyint] NOT NULL,
    [PLSystemName] [varchar](20) NULL,
    [PLSystemFlag] [char](2) NULL,
 CONSTRAINT [XPKPLSystem] PRIMARY KEY CLUSTERED 
(
    [PLSystemID] ASC
)
) ON [PRIMARY]
END
GO

4 游标

Begin
declare @PluserID varchar(8)
declare pluserCurse Cursor for select PLUserID from PLUser where PCancelJudge=0
open pluserCurse  --打开游标
fetch next from pluserCurse into @PluserID
while @@FETCH_STATUS=0
begin
print (@PluserID)
insert into PLUserActorDepart(DepartID,PLActorSystemID,PLUserID) 
select DepartmentID,PLSystemID,PLUserID from MSUserRight where MSUserRight.DepartmentID not in 
(
select DepartmentID from PLDepartment where PLDepartment.DParent=(select DepartmentID from PLUser where PLUserID=@PluserID ) 
OR PLDepartment.DepartmentID=(select DepartmentID from PLUser where PLUserID =@PluserID)
) AND MSUserRight.PLUserID=@PluserID
fetch next from pluserCurse into @PluserID
end
close pluserCurse
deallocate pluserCurse
end

5 用while实现for循环

 Create Proc InsertSQL
  AS
  Begin
  DECLARE @Count int
  set @Count=0;
  While(@Count<200000)
  Begin
    Print(@Count);
    Insert into Student values('YOUNG','M',100,'FUJIANXIAMENT');
    set @Count=@Count+1;
  END
  END

 6.删除约束

ALTER TABLE [UniCloud.Component].[dbo].[AC_TYPE] DROP CONSTRAINT [FK_dbo.AC_TYPE_dbo.AC_CATEGORY_ACCATEGORY_ID];

7.删除索引(前面不需要加表名)

 DROP INDEX [dbo].[AC_TYPE].[IX_ACCATEGORY_ID];

 8.如何将自定义变量，带入SQL查询语句中

SQL 2005

declare @num int;
set @num=1;
select top select(@num) * from Users

SQL2008

declare @num int;
set @num=1;
select top (@num) * from Users