Query for updating the records

Question

I have the two tables....
CREATE TABLE temp_1
( ST_NM VARCHAR2(30),STATUS_ID VARCHAR2(1) NOT NULL ENABLE,ST_ID VARCHAR2(20) primary key,REJ_USER_NM varchar2(10))
sample Data :
insert into temp_1 values('S010054','R','ST9749109','TEST_1');
insert into temp_1 values('S010179','R','ST9749147','');
insert into temp_1 values('S010582','N','ST9749258','');
CREATE TABLE temp_2
( REJ_USER_NM VARCHAR2(20),ST_NM VARCHAR2(30),
STATUS_ID VARCHAR2(1) NOT NULL ENABLE,ST_ID VARCHAR2(20))
sample data:
insert into temp_2 values('','S010054','N','ST9749109');
insert into temp_2 values('','S010054','N','ST9749109');
insert into temp_2 values('TEST_1','S010054','N','ST9749109'');
insert into temp_2 values('','S010054','I','ST9749109');
insert into temp_2 values('','S010179','N','ST9749147');
insert into temp_2 values('TEST_2','S010179','N','ST9749147');
insert into temp_2 values('','S010179','N','ST9749147');
insert into temp_2 values('','S010179','N','ST9749147')
insert into temp_2 values('TEST_5','S010582','R','ST9749258');
insert into temp_2 values('TEST_5','S010582','N','ST9749258');
insert into temp_2 values('','S010582','N','ST9749258');
insert into temp_2 values('','S010582','N','ST9749258')
I want the UPDATE query based on below conditions to update the REJ_USER_NM in temp_1 table.
From temp_1 table ,STATUS_ID is 'R' and REJ_USER_NM is null and compare the set_id column value
with the temp_2 table,where REJ_USER_NM is not null and status id is 'N'. REJ_USER_NM column from
temp_2 table need to be update in the REJ_USER_NM column of temp_1 table.
After completion of updation,output is in below format; if i run below qry
====================================
select * from temp_1;
{S010054},{R},{ST9749109},{TEST_1}
{S010179},{R},{ST9749147},{TEST_2}
{S010582},{N},{ST9749258},{}
======================
Edited by: 849971 on May 2, 2011 8:25 PM

Answer 1

Why is that the row
{S010582},{N},{ST9749258},{}
is not updated to TEST_5 ?? Based on your rules and data. it must be updated to test_5. Are you missng any rules?
Try some thing like,
UPDATE temp_1
   SET REJ_USER_NM  =
          (SELECT REJ_USER_NM
             FROM temp_2
            WHERE     status_id = 'N'
                  AND temp_1.st_id = temp_2.st_id
                  AND temp_2.REJ_USER_NM IS NOT NULL)