在oracle数据库里创建自增ID字段的步骤

CREATE TABLE ADVICE(ID INT NOT NULL,ACTIVE INT DEFAULT 1 NOT NULL,TYPE INT NOT NULL, MSG VARCHAR2(512) NOT NULL,ADVICE VARCHAR2(4000) NOT NULL,PRIMARY KEY(ID),CONSTRAINT ADVICE_UNI UNIQUE(TYPE,MSG))TABLESPACE MYDB;--创建自增ID，名称为：表名_字段名_SEQCREATE SEQUENCE ADVICE_ID_SEQ MINVALUE 1 NOMAXVALUE INCREMENT BY 1 START WITH 1 NOCACHE;-- 为Insert操作创建触发器，无需在SQL语句里写NEXTVAL，名称为表名_INS_TRGCREATE OR REPLACE TRIGGER ADVICE_INS_TRG BEFORE INSERT ON ADVICE FOR EACH ROW WHEN(NEW.ID IS NULL)BEGINSELECT ADVICE_ID_SEQ.NEXTVAL INTO :NEW.ID FROM DUAL;END;