Sql Server和Access操作數(shù)據(jù)庫結(jié)構(gòu)Sql語句

2010-08-28 10:50:09來源:西部e網(wǎng)作者:

下面是Sql Server 和 Access 操作數(shù)據(jù)庫結(jié)構(gòu)的常用Sql,希望對你有所幫助。

新建表:
create table [表名]
(
[自動(dòng)編號字段] int IDENTITY (1,1) PRIMARY KEY ,
[字段1] nVarChar(50) default '默認(rèn)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(shù)據(jù):
INSERT INTO [表名] (字段1,字段2) VALUES (100,'51WINDOWS.NET')

刪除數(shù)據(jù):
DELETE FROM [表名] WHERE [字段名]>100

更新數(shù)據(jù):
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(shù)據(jù)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(rèn)值
ALTER TABLE [表名] ADD CONSTRAINT 默認(rèn)值名 DEFAULT '51WINDOWS.NET' FOR [字段名]

刪除默認(rèn)值
ALTER TABLE [表名] DROP CONSTRAINT 默認(rèn)值名

刪除Sql Server 中的日志,減小數(shù)據(jù)庫文件大小
dump transaction 數(shù)據(jù)庫名 with no_log
backup log 數(shù)據(jù)庫名 with no_log
dbcc shrinkdatabase(數(shù)據(jù)庫名)
exec sp_dboption '數(shù)據(jù)庫名', 'autoshrink', 'true'

\'添加字段通用函數(shù)
Sub AddColumn(TableName,ColumnName,ColumnType)
Conn.Execute("Alter Table "&TableName&" Add "&ColumnName&" "&ColumnType&"")
End Sub

\'更改字段通用函數(shù)
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(gè)數(shù)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(gè)表的結(jié)構(gòu)
select * from syscolumns where id = object_id(N'[dbo].[你的表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1
關(guān)鍵詞:SqlServerAccess

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