merge into copy_emp1 c
using employees e
on (c.employee_id=e.employee_id)
when matched then
update set
c.first_name=e.first_name,
c.last_name=e.last_name,
c.email=e.email,
c.phone_number=e.phone_number,
c.hire_date=e.hire_date,
c.job_id=e.job_id,
c.salary=e.salary,
c.commission_pct=e.commission_pct,
c.manager_id=e.manager_id,
c.department_id=e.department_id
when not matched then
insert values(e.employee_id,e.first_name,e.last_name,e.email,e.phone_number,
e.hire_date,e.job_id,e.salary,e.commission_pct,e.manager_id,e.department_id)
注意：被on关联的列（employee_id）不能被更新，否则会报错ORA-38104：无法
更新on子句中引用的列。
--实验
JOHN@ ora10g> select * from jobs;
JOB_ID JOB_TITLE MIN_SALARY MAX_SALARY
---------- ------------ ---------- ----------
ad_pres vp 20000 40000
fi_account accountant 4200 9000
st_clerk stock clerk 2000 5000
it_prog programmer 4000 10000
dba db admin 4200 9000
JOHN@ ora10g> select * from jobs_acquisition;
JOB_ID JOB_TITLE MIN_SALARY MAX_SALARY
---------- ------------ ---------- ----------
ad_pres vp 10000 40000
dba db admin 4200 9000
JOHN@ ora10g> merge into jobs j
2 using (select * from jobs_acquisition) a
3 on (j.job_id=a.job_id)
4 when matched then
5 update set
6 j.job_title=a.job_title,
7 j.min_salary=a.min_salary,
8 j.max_salary=a.max_salary
9 when not matched then
10 insert (j.job_id, j.job_title, j.min_salary, j.max_salary)
11 values (a.job_id, a.job_title, a.min_salary, a.max_salary);
JOHN@ ora10g> select * from jobs;
JOB_ID JOB_TITLE MIN_SALARY MAX_SALARY
---------- ------------ ---------- ----------
ad_pres vp 10000 40000
fi_account accountant 4200 9000
st_clerk stock clerk 2000 5000
it_prog programmer 4000 10000
dba db admin 4200 9000
JOHN@ ora10g> select * from jobs_acquisition;
JOB_ID JOB_TITLE MIN_SALARY MAX_SALARY
---------- ------------ ---------- ----------
ad_pres vp 10000 40000
dba db admin 4200 9000
