Need to update the table

Release of PL/SQL version 11.2.0.2.0 - Production

Hi gurus

You need assistance in question. I have the following data:

Sample data

drop table aa;

drop table bb;
create table aa
(
cust_no number (5),
cust_name varchar2 (30)
);

Insert in the NOA
(
Select 100, 'A' from two
Union of all the
Select 200, 'B' double
Union of all the
Select 300, 'C' of the double
);

create table bb
(
cust_no number (5),
cust_caty varchar2 (15)
);
Insert into bb
(
Select NULL, 'Potential' from dual
Union of all the
Select NULL, 'Not Potencial' of the double
Union of all the
Select NULL, "Unknown" of the double
);

Now, I want to update my bb with cust_id without no join table...

My required data should be something like below in the table of bb:

CUST_NO, CUST_CATY

100 potential

200 potential not

300 stranger

Please note that it doesn't matter what cust_no arrive at any cust_caty

Concerning

Shu

Hi, Shu,

Here's one way:

MERGE INTO dst bb

WITH THE HELP OF)

WITH aa_r_num AS

(

SELECT cust_no

ROWNUM AS r_num

AA

)

bb_r_num AS

(

SELECT cust_caty

ROWNUM AS r_num

BB

)

SELECT a.cust_no

b.cust_caty

Of aa_r_num one

JOIN bb_r_num b ON b.r_num = a.r_num

) src

WE (dst.cust_caty = src.cust_caty)

WHEN MATCHED THEN UPDATE

SET dst.cust_no = src.cust_no

;

The results I get are exactly what you posted:

CUST_NO CUST_CATY

---------- ---------------

100 potential

200 potential not

300 stranger

But there is no guarantee that the same cust_no at the same cust_caty when you run it.

As posted, which means that bb.cust_caty is unique and not NULL.

If there are N + X lines in the bb, but only N lines in aa, then only N lines in bb will be updated.

Why do you want to do "without no join"? If a join is the most simple, average the most effective to achieve the results expected, so why not use it?

If you really want to avoid the join, you can use a scalar subquery.

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1          IND          INDIA          2          AP          ANDHRA PRADESH     2     SEC          SECUNDRABAD
2          AUS          AUSTRALIA     1          QLD          QUEENSLAND     1     BRI          BRISBANE
2          AUS          AUSTRALIA     2          TAS          TASMANIA     1     HB          HOBART
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