Oracle 对现有的已经含有数据表添加自动递增的ID（ID字段已经存在，只是ID没有数据）

如果原来的表中不存在ID，可以直接用命令行添加一个主键ID字段

ALTER TABLE "tablename" ADD ID NUMBER；--添加ID字段
ALTER TABLE "tablename" ADD PRIMARY KEY ("ID");--给ID添加主键

已经含有ID字段时就可以按下面SQL来执行

---(1)创建一个和原来表结构相同的表

CREATE TABLE tjc01_4_TEMP AS SELECT * FROM tjc01_4 WHERE 1=0;
CREATE TABLE TJC01_5_TEMP AS SELECT * FROM TJC01_5 WHERE 1=0;
CREATE TABLE TJC01_7_TEMP AS SELECT * FROM TJC01_7 WHERE 1=0;
CREATE TABLE TJC01_9_TEMP_TEMP AS SELECT * FROM TJC01_9 WHERE 1=0;
CREATE TABLE TZY12_TEMP AS SELECT * FROM TZY12 WHERE 1=0;
CREATE TABLE TJC16_1_TEMP AS SELECT * FROM TJC16_1 WHERE 1=0;


--(2)新增序列号

-- Create sequence 
create sequence SEQ_TJC01_4
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;


-- Create sequence 
create sequence SEQ_TJC01_5
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;

-- Create sequence 
create sequence SEQ_TJC01_7
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;

-- Create sequence 
create sequence SEQ_TJC01_9
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;

-- Create sequence 
create sequence SEQ_TJC16_1
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;


-- Create sequence 
create sequence SEQ_TZY12
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;




--(3)给新建的表添加自增id的触发器
--tjc01_4
 CREATE OR REPLACE TRIGGER trr_tjc01_4 before insert on tjc01_4_TEMP for each row
                        DECLARE next_id NUMBER;
            begin
              select seq_tjc01_4.nextval into next_id from dual;
                        :new.id := next_id;
            end;
 --TJC01_5        
 CREATE OR REPLACE TRIGGER trr_TJC01_5 before insert on TJC01_5_TEMP for each row
                        DECLARE next_id NUMBER;
            begin
              select seq_TJC01_5.nextval into next_id from dual;
                        :new.id := next_id;
            end;

 --TJC01_7
 
 CREATE OR REPLACE TRIGGER trr_TJC01_7 before insert on TJC01_7_TEMP for each row
                        DECLARE next_id NUMBER;
            begin
              select seq_TJC01_7.nextval into next_id from dual;
                        :new.id := next_id;
            end;

--   TJC01_9         
 CREATE OR REPLACE TRIGGER trr_TJC01_9 before insert on TJC01_9_TEMP_TEMP for each row
                        DECLARE next_id NUMBER;
            begin
              select seq_TJC01_9.nextval into next_id from dual;
                        :new.id := next_id;
            end;           

 -- TZY12              
 CREATE OR REPLACE TRIGGER trr_TZY12 before insert on TZY12_TEMP for each row
                        DECLARE next_id NUMBER;
            begin
              select seq_TZY12.nextval into next_id from dual;
                        :new.id := next_id;
            end;

 --TJC16_1
 CREATE OR REPLACE TRIGGER trr_TJC16_1 before insert on TJC16_1_TEMP for each row
                        DECLARE next_id NUMBER;
            begin
              select seq_TJC16_1.nextval into next_id from dual;
                        :new.id := next_id;
            end;

  --（4）将原来表数据插入到新建的表中          
  insert into tjc01_4_TEMP  SELECT * FROM tjc01_4 WHERE 1=1;  
  select *from tjc01_4_TEMP;
  insert into TJC01_5_TEMP  SELECT * FROM TJC01_5 WHERE 1=1;
  select *from TJC01_5_TEMP;
  insert into TJC01_7_TEMP  SELECT * FROM TJC01_7 WHERE 1=1;
  select *from TJC01_7_TEMP;
  insert into TJC01_9_TEMP_TEMP  SELECT * FROM TJC01_9 WHERE 1=1;
  select *from TJC01_9_TEMP_TEMP;
  insert into TZY12_TEMP  SELECT * FROM TZY12 WHERE 1=1;
  select *from TZY12_TEMP;
  insert into TJC16_1_TEMP  SELECT * FROM TJC16_1 WHERE 1=1;
  select *from TJC16_1_TEMP;
  
  
  
  
  --(5)将原来的表名更改新的文字（也可以说是备份原来的表）
           
  
ALTER TABLE tjc01_4 RENAME TO tjc01_4_test;
ALTER TABLE TJC01_5 RENAME TO TJC01_5_test;
ALTER TABLE TJC01_7 RENAME TO TJC01_7_test;
ALTER TABLE TJC01_9 RENAME TO TJC01_9_test;
ALTER TABLE TZY12 RENAME TO TZY12_test;
ALTER TABLE TJC16_1 RENAME TO TJC16_1_test;

--（6）将新表的表名更改为原来的表名

ALTER TABLE tjc01_4_TEMP RENAME TO tjc01_4;
ALTER TABLE TJC01_5_TEMP RENAME TO TJC01_5;
ALTER TABLE TJC01_7_TEMP RENAME TO TJC01_7;
ALTER TABLE TJC01_9_TEMP_TEMP RENAME TO TJC01_9;
ALTER TABLE TZY12_TEMP RENAME TO TZY12;
ALTER TABLE TJC16_1_TEMP RENAME TO TJC16_1;