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) NULL
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
\''檢查表是否存在
sql="select count(*) as dida from sysobjects where id = object_id(N''[所有者].[表名]'') and OBJECTPROPERTY(id, N''IsUserTable'') = 1"
set rs=conn.execute(sql)
response.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