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SQL> DESC v$controlfile
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 ----------------------------------------- -------- ----------------------------
 STATUS                                             VARCHAR2(7)
 NAME                                           &nbs ......

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SQL> DESC v$controlfile
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 ----------------------------------------- -------- ----------------------------
 STATUS                                             VARCHAR2(7)
 NAME                                           &nbs ......

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       CREATE TABLE example(
             ID Number(4) NOT NULL PRIMARY KEY,
             NAME VARCHAR(25),
             PHONE VARCHAR(10),
             ADDRESS VARCHAR(50) );
È»ºó£¬ÄãÐèÒªÒ»¸ö×Ô¶¨ÒåµÄsequence
      CREATE SEQUENCE emp_sequence
          INCREMENT BY 1 -- ÿ´Î¼Ó¼¸¸ö
          START WITH 1 -- ´Ó1¿ªÊ¼¼ÆÊý
          NOMAXVALUE -- ²»ÉèÖÃ×î´óÖµ
          NOCYCLE -- Ò»Ö±ÀÛ¼Ó£¬²»Ñ­»·
          NOCACHE -- ²»½¨»º³åÇø
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create table SYS_MESSAGE
(
ID NUMBER not null PRIMARY KEY,
M_TYPE VARCHAR2(10) not null,
TITLE VARCHAR2(200),
CONTENT LONG,
M_TIME VARCHAR2(50),
AUTHOR VARCHAR2(20)
);
CREATE SEQUENCE SYS_MESSAGE_ID_SEQ
INCREMENT BY 1
START WITH 1
NOMAXVALUE
MINVALUE 1
CACHE 50
;

CREATE OR REPLACE TRIGGER SYS_MESSAGE_ID_TRIGGER
BEFORE INSERT ON SYS_MESSAGE
FOR EACH ROW
WHEN (NEW.ID IS NULL)
BEGIN
SELECT SYS_MESSAGE_ID_SEQ.NEXTVAL INTO:NEW.ID from DUAL;
END; ......

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