在SQL 2012中使用和Oracle 一样的序列

SQL Server 现在将序列当成一个对象来实现，创建一个序列的语法如下：

CREATE SEQUENCE [schema_name . ] sequence_name
[ AS [ built_in_integer_type | user-defined_integer_type ] ]
[ START WITH <constant> ]
[ INCREMENT BY <constant> ]
[ { MINVALUE [ <constant> ] } | { NO MINVALUE } ]
[ { MAXVALUE [ <constant> ] } | { NO MAXVALUE } ]
[ CYCLE | { NO CYCLE } ]
[ { CACHE [ <constant> ] } | { NO CACHE } ]
[ ; ]

创建示例：

CREATE SEQUENCE Sequence_Test
AS [bigint]
START WITH 0
INCREMENT BY 1
MINVALUE 0
MAXVALUE 9223372036854775807
CACHE
GO

使用序列：

SELECT NEXT VALUE FOR Sequence_Test
或者下面查询序列属性
SELECT * FROM sys.sequences WHERE name = 'Sequence_Test';

重置序列：

ALTER SEQUENCE Sequence_Test
RESTART WITH 1 ;

序列可定义为任意整数类型，如下面类型：

tinyint - 范围从 0 到 255

smallint - 范围从 -32,768 到 32,767

int - 范围从 -2,147,483,648 到 2,147,483,647

bigint - 范围从 -9,223,372,036,854,775,808 到 9,223,372,036,854,775,807

decimal 和 numeric，小数位数为 0。