--创建部门表 dept:
CREATE TABLE dept
(
 deptno NUMBER(2) CONSTRAINT PK_DEPT PRIMARY KEY,
 dname VARCHAR2(14) ,
 loc VARCHAR2(13) , 
 CREATEDTIME DATE, 
 UPDATEDTIME DATE, 
 CREATEDBY NUMBER(7,0), 
 UPDATEDBY NUMBER(7,0)
) ;

--创建员工表 emp:
CREATE TABLE emp
(  empno NUMBER(4) CONSTRAINT PK_EMP PRIMARY KEY,
  ename VARCHAR2(10),
  job VARCHAR2(15),
  mgr NUMBER(4),
  hiredate DATE,
  sal NUMBER(7,2),
  comm NUMBER(7,2),
  deptno NUMBER(2) CONSTRAINT FK_DEPTNO REFERENCES DEPT, 
  CREATEDTIME DATE, 
  UPDATEDTIME DATE, 
  CREATEDBY NUMBER(7,0), 
  UPDATEDBY NUMBER(7,0)
);

--创建员工表 emp_copy:
CREATE TABLE emp_copy
(  empno NUMBER(4),
  ename VARCHAR2(10),
  job VARCHAR2(15),
  mgr NUMBER(4),
  hiredate DATE,
  sal NUMBER(7,2),
  comm NUMBER(7,2),
  deptno NUMBER(2), 
  CREATEDTIME DATE, 
  UPDATEDTIME DATE, 
  CREATEDBY NUMBER(7,0), 
  UPDATEDBY NUMBER(7,0)
 );
--自定义一个序列 
 create sequence emp_sequence
    increment by 1 --每次增加几个，我这里是每次增加1 
    start with 1  --从1开始计数 
    nomaxvalue   --不设置最大值 
    nocycle     --一直累加，不循环 
    nocache    --不建缓冲区 

--插入dept表数据:
INSERT INTO dept VALUES(10,'ACCOUNTING','NEW YORK',sysdate,sysdate,123123,123123);
INSERT INTO dept VALUES (20,'RESEARCH','DALLAS',sysdate,sysdate,123123,123123);
INSERT INTO dept VALUES(30,'SALES','CHICAGO',SYSDATE,SYSDATE,123123,123123);
INSERT INTO dept VALUES(40,'OPERATIONS','BOSTON',sysdate,sysdate,123123,123123);

--插入emp表数据:
INSERT INTO emp VALUES(7369,'SMITH','CLERK',7902,to_date('17-12-1980','dd-mm-yyyy'),800,NULL,20,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30,SYSDATE,SYSDATE,123123,123123);
INSERT INTO emp VALUES(7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30,SYSDATE,SYSDATE,123123,123123);
INSERT INTO emp VALUES(7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450,NULL,10,SYSDATE,SYSDATE,123123,123123);
INSERT INTO emp VALUES(7788,'SCOTT','ANALYST',7566,to_date('19-4-87','dd-mm-yyyy'),3000,NULL,20,SYSDATE,SYSDATE,123123,123123);
INSERT INTO emp VALUES(7839,'KING','PRESIDENT',NULL,to_date('17-11-1981','dd-mm-yyyy'),5000,NULL,10,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30,SYSDATE,SYSDATE,123123,123123);
INSERT INTO emp VALUES(7876,'ADAMS','CLERK',7788,to_date('23-5-87','dd-mm-yyyy'),1100,NULL,20,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950,NULL,30,sysdate,sysdate,123123,123123);
INSERT INTO emp VALUES(7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000,NULL,20,SYSDATE,SYSDATE,123123,123123);
INSERT INTO emp VALUES(7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300,NULL,10,sysdate,sysdate,123123,123123);

INSERT INTO emp_copy
SELECT emp_sequence.nextVal,C.* FROM (
  SELECT 
  e.ename ,
  e.JOB ,
  e.mgr ,
  e.hiredate,
  e.sal ,
  e.comm ,
  e.deptno,
  SYSDATE AS CREATEDTIME,
  SYSDATE AS UPDATEDTIME,
  123124 AS CREATEDBY,
  123124 as UPDATEDBY
  FROM emp e, dept d
  WHERE e.deptno = d.deptno
  AND d.loc='CHICAGO'
  and e.sal>=1500 
 )C;

MERGE INTO emp e
 USING 
 (
  SELECT e1.job, e1.ename,e1.comm FROM emp e1, dept d1
  WHERE e1.deptno = d1.deptno
  AND d1.loc='CHICAGO'
  and e1.job='SALESMAN'
 )t 
 ON (
  e.job = t.job and e.ename = t.ename
 )
 WHEN MATCHED THEN
  UPDATE 
   set e.comm= t.comm+200

DELETE FROM
(
 SELECT c.*
 FROM emp c,dept d
 WHERE d.deptno = c.deptno AND d.loc = 'CHICAGO'
 and c.sal  1500
);