SQL server 和Oracle 序列

BEGIN
IF EXISTS (SELECT * FROM sysobjects WHERE name = ‘event_seq‘)
DROP SEQUENCE event_seq
END
CREATE SEQUENCE event_seq
MINVALUE 1
MAXVALUE 999999999999999999
START WITH 1
INCREMENT BY 1
CACHE 20;
 --使用时
GO
select next value for event_seq;

GO
INSERT INTO NAMETABLE (INDEX,NAME) VALUES (2,‘S_CN‘ + rtrim(ltrim(right(cast(‘00000000‘+rtrim(next value for ENTITY_SEQ) as varchar(20)),10))))
--查询下个序列值
SELECT
NEXT VALUE FOR [dbo].[ATTENDANCE_SEQ];
--查询当前序列值
SELECT cache_size, current_value 
FROM sys.sequences
WHERE name = ‘ATTENDANCE_SEQ‘ 

BEGIN
    EXECUTE IMMEDIATE ‘DROP SEQUENCE STAFF_SEQ‘;
    EXCEPTION WHEN OTHERS THEN NULL;
END;
CREATE SEQUENCE STAFF_SEQ
MINVALUE 1
MAXVALUE 999999999999999999999999999
START WITH 1
INCREMENT BY 1
CACHE 20;
--在触发器中使用序列
CREATE OR REPLACE TRIGGER TR_INST_STAFF
    BEFORE INSERT ON M_MAINTENANCESTAFF
    FOR EACH ROW
BEGIN
    select STAFF_SEQ.NEXTVAL into :new.STAFFINDEX from dual;
END;
--STAFF_SEQ.NEXTVAL标示下一个序列值
--STAFF_SEQ.CURRVAL标示下一个序列值