新建表:
create table [表名]
(
[自動編號字段] int IDENTITY (1,1) PRIMARY KEY ,
[字段1] nVarChar(50) default '默認值' 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 ,
)
刪除表:
Drop table [表名]
插入數據:
INSERT INTO [表名] (字段1,字段2) VALUES (100,'51Windows.Net')
刪除數據:
DELETE FROM [表名] WHERE [字段名]>100
更新數據:
UPDATE [表名] SET [字段1] = 200,[字段2] = '51Windows.Net' WHERE [字段三] = 'HAIWA'
新增字段:
ALTER TABLE [表名] ADD [字段名] NVARCHAR (50)
刪除字段:
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,請參考文章:在Access數據庫中重命名表)
sp_rename '表名', '新表名', 'OBJECT'
新建約束:
ALTER TABLE [表名] ADD CONSTRAINT 約束名 CHECK ([約束字段] <= '2000-1-1')
刪除約束:
ALTER TABLE [表名] DROP CONSTRAINT 約束名
新建默認值
ALTER TABLE [表名] ADD CONSTRAINT 默認值名 DEFAULT '51Windows.Net' FOR [字段名]
刪除默認值
ALTER TABLE [表名] DROP CONSTRAINT 默認值名
刪除SQL Server 中的日志,減小數據庫文件大小
dump transaction 數據庫名 with no_log
backup log 數據庫名 with no_log
dbcc shrinkdatabase(數據庫名)
exec sp_dboption '數據庫名', 'autoshrink', 'true'
\'添加字段通用函數
Sub AddColumn(TableName,ColumnName,ColumnType)
Conn.Execute("Alter Table "&TableName&" Add "&ColumnName&" "&ColumnType&"")
end sub
\'更改字段通用函數
Sub ModColumn(TableName,ColumnName,ColumnType)
Conn.Execute("Alter Table "&TableName&" Alter Column "&ColumnName&" "&ColumnType&"")
End Sub
sql="select count(*) as dida from sysobjects where id = object_id(N'[所有者].[表名]') and OBJECTPROPERTY (id, N'IsUserTable') = 1"
3kT$q9X;z0set rs=conn.execute(sql)
0response.write rs("dida")'返回一個數值,0代表沒有,1代表存在
判斷表的存在:
select * from sysobjects where id = object_id(N'[dbo].[tablename]') and OBJECTPROPERTY(id, N'IsUserTable') = 1
某個表的結構
select * from syscolumns where id = object_id(N'[dbo].[你的表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1