2.添加字段:ALTER TABLE 表名 ADD 字段名 数据类型[属性]; 3.修改字段:ALTER TABLE 表名 CHANGE 原字段名 新字段名 数据类型[属性]; 4.删除字段:ALTER TABLE 表名 DROP 字段名; 2.添加主键 1.语法:ALTER TABLE 表名 ADD CONSTRAINT 主键名 PRIMARY KEY 表名(主键字段); 3.添加外键 1.语法:ALTER TABL...
To create a clustered primary key on an existing table:[cc lang=”sql”] ALTER TABLE dbo.Person ADD CONSTRAINT PK_Person PRIMARY KEY CLUSTERED (PersonID); [/cc]To create a non clustered primary key on an existing table:[cc lang=”sql”] ALTER TABLE dbo.Person ADD CONSTRAINT PK_Person ...
Azure SQL 托管实例将为添加的所有数据库文件自动配置路径,因此Azure SQL 托管实例中的ALTER DATABASE ADD FILE命令不允许使用FILENAME参数。 Azure SQL 数据库仅支持在PRIMARY文件组中创建已分区表。 有关适用于 Azure SQL 数据库的示例代码,请参阅使用 Transact-SQL 在一个文件组上创建已分区表。
Below is an example of specifying the primary key on a single column usingALTER TABLE. The same SQL statement can be used in MySQL, Oracle, and SQL Server. ALTER TABLE Customer ADD PRIMARY KEY (SID); Note: Before using theALTER TABLEcommand to add a primary key, you'll need to make ...
.DateTime) tab1.Columns.Add(col3) ' Create the ftable tab1.Create() ' Define Index object on the table by supplying the Table1 as the parent table and the primary key name in the constructor. Dim pk As New Index(tab1, "Table1_PK") pk.IndexKeyType = IndexKeyType.DriPrimaryKey '...
Reading: 661 times: 2010-09-24 15:52:35 font: [large, medium, small] In the SQL database, how to define SQL primary key is often encountered problems, the following will introduce you two definitions of SQL primary key method, for your reference, I hope that you can help. The SQL ...
ALTER TABLE(使用UNIQUE索引选项添加或删除PRIMARY KEY约束或CLUSTERED约束) 有关联机创建、重新生成或删除索引的更多限制和局限性,请参阅联机索引操作指南。 权限 要求具有对表或视图的ALTER权限。 使用SQL Server Management Studio 在“对象资源管理器”中,选择加号以便展开包含您要联机重新生成索引的表的数据库。
ADD CONSTRAINT [FK_Course_Department] FOREIGN KEY([DepartmentID]) REFERENCES [dbo].[Department] ([DepartmentID]) GO ALTER TABLE [dbo].[Course] CHECK CONSTRAINT [FK_Course_Department] GO ALTER TABLE [dbo].[StudentGrade] WITH CHECK ADD CONSTRAINT [FK_StudentGrade_Student] FOREIGN KEY(...
FILENAME = N'C:\BlobStore\FS2',MAXSIZE=100MB )LOGON(NAME= N'BlobStore1_log', FILENAME = N'C:\BlobStore\BlobStore1_log.ldf',SIZE=100MB,MAXSIZE=1GB, FILEGROWTH =1MB ); GOALTERDATABASE[BlobStore1]ADDFILE(NAME= N'FS3', FILENAME = N'C:\BlobStore\FS3',MAXSIZE=100MB )TOFILEGROUP ...
Alter Table add Column - How do you add a column after say the second column Alter table add constraint primary key clustered identity(1,1) ALTER TABLE ALTER COLUMN (To set the default value) ALTER TABLE Progress? ALTER TABLE SWITCH statement failed. Check constraints or partition function of...