--先建立一個序列

CREATE SEQUENCE SEQ_T_GM_COMMUNITY      INCREMENT BY 1      MAXVALUE 9999999999999999999999999999      MINVALUE 1      CYCLE      CACHE 20 ORDER;

--建立一個觸發器

create or replace trigger "BI_T_GM_COMMUNITY"   before insert on "T_GM_COMMUNITY"   for each row begin   if :NEW."ID" is null then     select "SEQ_T_GM_COMMUNITY".nextval into :NEW."ID" from sys.dual;   end if; end;

--建立一張表

--建立一張表 create table T_GM_COMMUNITY (     ID NUMBER(8) PRIMARY KEY,     NAME VARCHAR2(100) NOT NULL,     HEAD_IMG VARCHAR2(150) NOT NULL,     CREATE_DATE DATE DEFAULT SYSDATE,     TITLE VARCHAR(200) NOT NULL,     PRAISE NUMBER(8) DEFAULT 0,     REPLY NUMBER(8) DEFAULT 0,     TRANSPOND NUMBER(8) DEFAULT 0 )