SQL开发知识：Oracle中多表关联批量插入批量更新与批量删除操作

–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
);