这里是完整的解决方案w.r.t异常/错误处理自动增量，这个解决方案向后兼容，将工作在11g和12c，特别是如果应用程序在生产中。

请用合适的表名替换'TABLE_NAME'

--checking if table already exisits
BEGIN
    EXECUTE IMMEDIATE 'DROP TABLE TABLE_NAME';
    EXCEPTION WHEN OTHERS THEN NULL;
END;
/

--creating table
CREATE TABLE TABLE_NAME (
       ID NUMBER(10) PRIMARY KEY NOT NULL,
       .
       .
       .
);

--checking if sequence already exists
BEGIN
    EXECUTE IMMEDIATE 'DROP SEQUENCE TABLE_NAME_SEQ';
    EXCEPTION WHEN OTHERS THEN NULL;
END;

--creating sequence
/
CREATE SEQUENCE TABLE_NAME_SEQ START WITH 1 INCREMENT BY 1 MINVALUE 1 NOMAXVALUE NOCYCLE CACHE 2;

--granting rights as per required user group
/
GRANT SELECT, INSERT, UPDATE, DELETE ON TABLE_NAME TO USER_GROUP;

-- creating trigger
/
CREATE OR REPLACE TRIGGER TABLE_NAME_TS BEFORE INSERT OR UPDATE ON TABLE_NAME FOR EACH ROW
BEGIN    
    -- auto increment column
    SELECT TABLE_NAME_SEQ.NextVal INTO :New.ID FROM dual;

    -- You can also put some other required default data as per need of your columns, for example
    SELECT SYS_CONTEXT('USERENV', 'SESSIONID') INTO :New.SessionID FROM dual;
    SELECT SYS_CONTEXT('USERENV','SERVER_HOST') INTO :New.HostName FROM dual;
    SELECT SYS_CONTEXT('USERENV','OS_USER') INTO :New.LoginID FROM dual;    
    .
    .
    .
END;
/

FUNCTION UNIQUE2(
 seq IN NUMBER
) RETURN VARCHAR2
AS
 i NUMBER := seq;
 s VARCHAR2(9);
 r NUMBER(2,0);
BEGIN
  WHILE i > 0 LOOP
    r := MOD( i, 36 );
    i := ( i - r ) / 36;
    IF ( r < 10 ) THEN
      s := TO_CHAR(r) || s;
    ELSE
      s := CHR( 55 + r ) || s;
    END IF;
  END LOOP;
  RETURN 'ID'||LPAD( s, 14, '0' );
END;

也许可以试试这个简单的脚本:

http://www.hlavaj.sk/ai.php

结果是:

CREATE SEQUENCE TABLE_PK_SEQ; 
CREATE OR REPLACE TRIGGER TR_SEQ_TABLE BEFORE INSERT ON TABLE FOR EACH ROW 

BEGIN
SELECT TABLE_PK_SEQ.NEXTVAL
INTO :new.PK
FROM dual;
END;

FUNCTION GETUNIQUEID_2 RETURN VARCHAR2
AS
v_curr_id NUMBER;
v_inc NUMBER;
v_next_val NUMBER;
pragma autonomous_transaction;
begin 
CREATE SEQUENCE sequnce
START WITH YYMMDD0000000001
INCREMENT BY 1
NOCACHE
select sequence.nextval into v_curr_id from dual;
if(substr(v_curr_id,0,6)= to_char(sysdate,'yymmdd')) then
v_next_val := to_number(to_char(SYSDATE+1, 'yymmdd') || '0000000000');
v_inc := v_next_val - v_curr_id;
execute immediate ' alter sequence sequence increment by ' || v_inc ;
select sequence.nextval into v_curr_id from dual;
execute immediate ' alter sequence sequence increment by 1';
else
dbms_output.put_line('exception : file not found');
end if;
RETURN 'ID'||v_curr_id;
END;

假设您指的是类似SQL Server标识列的列?

在Oracle中，您可以使用SEQUENCE来实现相同的功能。我看看能不能找到一个好的链接，然后贴在这里。

更新:看起来你自己找到了。这里是链接: http://www.techonthenet.com/oracle/sequences.php

这里是完整的解决方案w.r.t异常/错误处理自动增量，这个解决方案向后兼容，将工作在11g和12c，特别是如果应用程序在生产中。

请用合适的表名替换'TABLE_NAME'

--checking if table already exisits
BEGIN
    EXECUTE IMMEDIATE 'DROP TABLE TABLE_NAME';
    EXCEPTION WHEN OTHERS THEN NULL;
END;
/

--creating table
CREATE TABLE TABLE_NAME (
       ID NUMBER(10) PRIMARY KEY NOT NULL,
       .
       .
       .
);

--checking if sequence already exists
BEGIN
    EXECUTE IMMEDIATE 'DROP SEQUENCE TABLE_NAME_SEQ';
    EXCEPTION WHEN OTHERS THEN NULL;
END;

--creating sequence
/
CREATE SEQUENCE TABLE_NAME_SEQ START WITH 1 INCREMENT BY 1 MINVALUE 1 NOMAXVALUE NOCYCLE CACHE 2;

--granting rights as per required user group
/
GRANT SELECT, INSERT, UPDATE, DELETE ON TABLE_NAME TO USER_GROUP;

-- creating trigger
/
CREATE OR REPLACE TRIGGER TABLE_NAME_TS BEFORE INSERT OR UPDATE ON TABLE_NAME FOR EACH ROW
BEGIN    
    -- auto increment column
    SELECT TABLE_NAME_SEQ.NextVal INTO :New.ID FROM dual;

    -- You can also put some other required default data as per need of your columns, for example
    SELECT SYS_CONTEXT('USERENV', 'SESSIONID') INTO :New.SessionID FROM dual;
    SELECT SYS_CONTEXT('USERENV','SERVER_HOST') INTO :New.HostName FROM dual;
    SELECT SYS_CONTEXT('USERENV','OS_USER') INTO :New.LoginID FROM dual;    
    .
    .
    .
END;
/