Compare and update

Question

Hello ,
I have one table where two different coulmn have zip code.
Column A have 9 digit Zip and Coulmn B have 5 digit Zip.
I want to update the coulmn B (with Remaining last 4 digit of column A ) if first five digit of Coulmn A is Match with Coulmn B 5 digit zip
Please, suggest.
A B
199711933     19971
200091557     20009
200152356 20015
200113574     20011
028650000 02865
199561030     19956
199771024     19977
Thanks in Advance

Answer 1

How about something like this?
UPDATE  ZIP_TABLE
SET     COLB = COLB || SUBSTR(COLA,6)
WHERE   SUBSTR(COLA,1,5) = COLB;Sample below:
SQL> CREATE TABLE    ZIP_TABLE
  2  (
  3          COLA    VARCHAR2(9)
  4  ,       COLB    VARCHAR2(9)
  5  );
Table created.
SQL> INSERT INTO ZIP_TABLE VALUES('199711933','19971');
1 row created.
SQL> INSERT INTO ZIP_TABLE VALUES('200091557','20009');
1 row created.
SQL> INSERT INTO ZIP_TABLE VALUES('200152356','20015');
1 row created.
SQL> INSERT INTO ZIP_TABLE VALUES('200113574','20011');
1 row created.
SQL> INSERT INTO ZIP_TABLE VALUES('028650000','02865');
1 row created.
SQL> INSERT INTO ZIP_TABLE VALUES('199561030','19956');
1 row created.
SQL> INSERT INTO ZIP_TABLE VALUES('199771024','19977');
1 row created.
SQL> SELECT * FROM ZIP_TABLE ORDER BY COLA;
COLA      COLB
028650000 02865
199561030 19956
199711933 19971
199771024 19977
200091557 20009
200113574 20011
200152356 20015
7 rows selected.
SQL> UPDATE  ZIP_TABLE
  2  SET     COLB = COLB || SUBSTR(COLA,6)
  3  WHERE   SUBSTR(COLA,1,5) = COLB;
7 rows updated.
SQL> SELECT * FROM ZIP_TABLE ORDER BY COLA;
COLA      COLB
028650000 028650000
199561030 199561030
199711933 199711933
199771024 199771024
200091557 200091557
200113574 200113574
200152356 200152356
7 rows selected.