上网找 alter column identity 语句,将表中的一个字段调整成自动新增。发现没有。 跟踪了一下sql server 执行这一动作的语句,发现是新建了新表,将字段修改成自动新增,然后将资料insert过去,再删表,改名字。
go--删除字段ID alter table [tbMessage] drop column [ID] ---增加ID自动增长字段 alter table [tbMessage] add [id] int identity(1,1)set identity_insert [tbMessage] on --将数据从临时表转移过来 insert into [tbMessage]([msg_content] ,[id]) select [msg_content] ,[id] from #tbMessage-...
--In this approach you can’t retain the existing data values on the newly created identity column; --The identity column will hold the sequence of number AlterTableNamesAddId_newIntIdentity(1,1) Go AlterTableNamesDropColumnID Go Execsp_rename'Names.Id_new','ID','Column' --- Code Snipp...
ALTER TABLE dbo.LED_Type ALTER COLUMN id IDENTITY(1,1)改成：ALTER TABLE test ADD id int identity(1,1)你没有指定数据类型int,改了就可以了。
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...
SQL Server的设计里并没有很简单的就现有的列加上或去掉标识属性的方法。最安全的办法是，创建一个新的列并设置为标识列，或者创建一个新的表，然后把
CopyCommandIdentityInsert CopyCredentialOption CopyOption CopyOptionKind CopyStatement CopyStatementOptionBase CreateAggregateStatement CreateApplicationRoleStatement CreateAssemblyStatement CreateAsymmetricKeyStatement CreateAvailabilityGroupStatement CreateBrokerPriorityStatement CreateCertificateStatement CreateColumnEncryptionKey...
SQL 複製 --Generate ALTER DATABASE ... MODIFY FILEGROUP statements --so that all read-write filegroups grow at the same time. SET NOCOUNT ON; DROP TABLE IF EXISTS #tmpdbs CREATE TABLE #tmpdbs (id INT IDENTITY(1,1), [dbid] INT, [dbname] sy...
If the modified column is an identity column, new_data_type must be a data type that supports the identity property. The current setting for SET ARITHABORT is ignored. ALTER TABLE operates as if ARITHABORT is set to ON. Note If the COLLATE clause isn't specified, changing the data type ...
不能为 CLR 表值函数指定 IDENTITY。seed 要分配给表中第一行的整数值。increment 要加到表中后续行的 seed 值上的整数值。< column_constraint >::= 和 < table_constraint>::=为指定列或表定义约束。 对于 CLR 函数,允许的唯一约束类型为 NULL。 不允许命名约束。