标签:select rop let 默认 delete object objects prim int
SQL脚本修改表结构
新建表:
create table [表名]
(
[自动编号字段] int IDENTITY (1,1) PRIMARY KEY ,
[字段1] nVarChar(50) default ‘默认值‘ null ,
[字段2] ntext null ,
[字段3] datetime,
[字段4] money null ,
[字段5] int default 0,
[字段6] Decimal (12,4) default 0,
[字段7] image null ,
)
删除表:
Drop table [表名]
Truncate table [表名] --不写log 而且自增字段复位从1开始
插入数据:
INSERT INTO [表名] (字段1,字段2) VALUES (1,‘ABC‘)
删除数据:
DELETE FROM [表名] WHERE [字段名]>100
更新数据:
UPDATE [表名] SET [字段1] = 1,[字段2] = ‘ABC‘ WHERE [字段三] = ‘what‘
新增字段:
ALTER TABLE [表名] ADD [字段名] NVARCHAR (50) NULL
添加多个字段时:ALTER TABLE [表名] ADD [字段名] NVARCHAR (50) NULL,[字段名] NVARCHAR (50) NULL
如:alter table DayLog add aaa char(10), abb char(10), acc char(10), ade char(10)
删除字段:
ALTER TABLE [表名] DROP COLUMN [字段名]
修改字段:
ALTER TABLE [表名] ALTER COLUMN [字段名] NVARCHAR (50) NULL
重命名表:(Access 重命名表,请参考文章:在Access数据库中重命名表)
sp_rename ‘表名‘, ‘新表名‘, ‘OBJECT‘
新建约束:
ALTER TABLE [表名] ADD CONSTRAINT 约束名 CHECK ([约束字段] <= ‘2010-12-1‘)
删除约束:
ALTER TABLE [表名] DROP CONSTRAINT 约束名
如:IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N‘[dbo].[FK_BuiAddProType_BuildFunction]‘) AND type = ‘F‘)
ALTER TABLE [dbo].[BuiAddProType] DROP CONSTRAINT [FK_BuiAddProType_BuildFunction]
GO
新建默认值
ALTER TABLE [表名] ADD CONSTRAINT 默认值名 DEFAULT ‘ABC‘ FOR [字段名]
删除默认值
ALTER TABLE [表名] DROP CONSTRAINT 默认值名
标签:select rop let 默认 delete object objects prim int
原文地址:https://www.cnblogs.com/jasonlai2016/p/12304601.html