Displaying the rows that have been updated....

Question

SQL> select * from spr;
EMP_NAME EMP_no age sex
hry 45353 42 M
spt 43436 34 M
pen 34533 21 M
aen 65475 33 M
SQL> select * from sprfac;
EMP_NAME EMP_no age sex Appraisal Extra_Time
hry 45353 N N
spt 43436 N N
pen 34533 N N
aen 65475 N N
I have a problem regarding updating the sprfac table.
What i need is to satisfy the following conditions and update the second table with values in the second table.
I need to upadate the second table when:
1. The emp_name and emp_no of first table matches with the second table and
2. The Appraisal field and extra_time field should be 'N' in the second table and
3. only if the values of age and sex are NULL.
Let me explain in detail.
My original table is sprfac. spr is Temporary Table.
I have some data in flat files and i have loaded all the data into a temporary table using sqlloader. Now i need to update the second table.
Originally the age and sex fields in the sprfac table are NULL. Once i update the age and sex fields in the sprfac table again if i do update it should not update the rows which have data in age and sex columns.
Suggest me how to update multiple columns simultaneously or send me the code for the update statement if possible.
NOTE: I have changed the tablenames and column names since i cannot keep the original tables here.
And i got the following reply........
update sprfac a
set (a.age, a.sex) = (select b.age, b.sex from spr b
where a.emp_name = b.emp_name
and a.emp_no = b.emp_no
and appraisal = 'N'
and extra_time = 'N')
where a.age is null
and a.sex is null;
Everything is working fine.
Is there any way to send the name and age fields which have been updated of sprfac to a file.
should i use cursors....
Send me the code if possible....
Thanks..........

Answer 1

You can try similar to this, if you have oracle 9i. In 8i merge does not work. In that case u have cursor.
merge into EMP e1
using akg_emp e2
on ( e2.empno = e1.empno AND e1.sal > 1000 AND <whatever condition on e1>)
when matched then
update set e1.sal = 100
when not matched then
insert ( empno, ename, job, mgr, hiredate, sal, comm, deptno )
values ( e2.empno, e2.ename, e2.job, e2.mgr, e2.hiredate, e2.sal, e2.comm,
e2.deptno )