SQL语句创建数据库及操作

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新建数据库：CREATE DATABASE database_name [ ON [ PRIMARY ] [ [ ,...n ][ , [ ,...n ] ]][[ LOG ON { [ ,...n ] } ] ] [ COLLATE collation_name ] [ FOR { ATTACH [ WITH ]| ATTACH_REBUILD_LOG }][ WITH ] ][;] ::={ ( NAME = logical_file_name , FILENAME = 'os_file_name' [ , SIZE = size [ KB | MB | GB | TB ] ] [ , MAXSIZE = { max_size [ KB | MB | GB | TB ] | UNLIMITED } ] [ , FILEGROWTH = growth_increment [ KB | MB | GB | TB | % ] ]) [ ,...n ] } ::= { FILEGROUP filegroup_name [ DEFAULT ] [ ,...n ] } ::={ DB_CHAINING { ON | OFF }| TRUSTWORTHY { ON | OFF }} ::= { ENABLE_BROKER | NEW_BROKER | ERROR_BROKER_CONVERSATIONS }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] 插入数据： INSERT INTO [表名] (字段1,字段2) VALUES (100,/'51WINDOWS.NET/') /图片'F:/*.jpg'/日期 '2010.07.10'删除数据： DELETE FROM [表名] WHERE [字段名]>100 更新数据： 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 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] <= /'2000-1-1/') 删除约束： ALTER TABLE [表名] DROP CONSTRAINT 约束名新建默认值 ALTER TABLE [表名] ADD CONSTRAINT 默认值名 DEFAULT /'51WINDOWS.NET/' FOR [字段名] 删除默认值 ALTER TABLE [表名] DROP CONSTRAINT 默认值名删除Sql Server 中的日志，减小数据库文件大小 dump transaction 数据库名 with no_log backup log 数据库名 with no_log dbcc shrinkdatabase(数据库名) exec sp_dboption /'数据库名/', /'autoshrink/', /'true/' ///'添加字段通用函数 Sub AddColumn(TableName,ColumnName,ColumnType) Conn.Execute(/"Alter Table /"&TableName&/" Add /"&ColumnName&/" /"&ColumnType&/"/") End Sub ///'更改字段通用函数 Sub ModColumn(TableName,ColumnName,ColumnType) Conn.Execute(/"Alter Table /"&TableName&/" Alter Column /"&ColumnName&/" /"&ColumnType&/"/") End Sub ///'检查表是否存在 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/")/'返回一个数值，0代表没有，1代表存在判断表的存在: select * from sysobjects where id = object_id(N/'[dbo].[tablename]/') and OBJECTPROPERTY(id, N/'IsUserTable/') = 1 某个表的结构 select * from syscolumns where id = object_id(N/'[dbo].[你的表名]/') and OBJECTPROPERTY(id, N/'IsUserTable/') = 1