Sequence对象对于Oracle用户来说是最熟悉不过的数据库对象了, 在SQL SERVER2012终于也可以看到这个对象了。Sequence是SQL Server2012推出的一个新特性。这个特性允许数据库级别的序列号在多表或多列之间共享。 回到顶部 二、Sequence基本概念 Oracle中有Sequence的功能,SQL server类似的功能要使用identity列实现,但是identity...
Sequence对象对于Oracle用户来说是最熟悉不过的数据库对象了, 在SQL SERVER2012终于也可以看到这个对象了。Sequence是SQL Server2012推出的一个新特性。这个特性允许数据库级别的序列号在多表或多列之间共享。 二、Sequence基本概念 Oracle中有Sequence的功能,SQL server类似的功能要使用identity列实现,但是identity列有很大...
IFEXISTS(SELECT*FROMsys.sequencesWHEREname=N'TestSeq')DROPSEQUENCE TestSeq;GO--创建序列对象CREATESEQUENCE TestSeqASTINYINTSTARTWITH1INCREMENTBY1;GO--创建表CREATETABLETEST(IDtinyint, Namevarchar(150))--产生序列号码并插入表中INSERTINTOTEST(ID,Name)VALUES(NEXTVALUEFORTestSeq,'allen')INSERTINTOTEST(...
IFEXISTS(SELECT*FROMsys.sequencesWHEREname=N'TestSeq')DROPSEQUENCE TestSeq;GO--创建序列对象CREATESEQUENCE TestSeqASTINYINTSTARTWITH1INCREMENTBY1;GO--创建表CREATETABLETEST(IDtinyint, Namevarchar(150))--产生序列号码并插入表中INSERTINTOTEST(ID,Name)VALUES(NEXTVALUEFORTestSeq,'allen')INSERTINTOTEST(...
A sequence object that is referenced in a default constraint can be altered. In the case of an INSERT ... SELECT or INSERT ... EXEC statement where the data being inserted comes from a query using an ORDER BY clause, the values being returned by the NEXT VALUE FOR function will be gen...
CREATE SCHEMA Test; GO CREATE TABLE Test.Orders ( OrderID INT PRIMARY KEY, Name VARCHAR (20) NOT NULL, Qty INT NOT NULL ); GO CREATE SEQUENCE Test.CountBy1 START WITH 1 INCREMENT BY 1; GO INSERT Test.Orders (OrderID, Name, Qty) VALUES ( NEXT VALUE FOR Test.CountBy1, 'Tire', ...
Below is the definition of how many values will be used for each referenced sequence object in a given statement: SELECT - For each referenced sequence object, a new value is generated once per row in the result of the statement. INSERT ... VALUES - For each referenced sequence object, a...
A sequence object that is referenced in a default constraint can be altered. In the case of anINSERT ... SELECTorINSERT ... EXECstatement where the data being inserted comes from a query using anORDER BYclause, the values being returned by theNEXT VALUE FORfunction will be generated in th...
GOCREATESEQUENCETest.CountBy1STARTWITH1INCREMENTBY1; GOINSERTTest.Orders (OrderID,Name, Qty)VALUES(NEXTVALUEFORTest.CountBy1,'Tire',2);INSERTtest.Orders (OrderID,Name, Qty)VALUES(NEXTVALUEFORTest.CountBy1,'Seat',1);INSERTtest.Orders (OrderID,Name, Qty)VALUES(NEXTVALUEFORTest.CountBy1,'Br...
Below is the definition of how many values will be used for each referenced sequence object in a given statement: SELECT - For each referenced sequence object, a new value is generated once per row in the result of the statement. INSERT ... VALUES - For each referenced sequence ...