Compare and update the same Column

Question

Hi ,
SQL> select * from
v$version;
BANNER
Oracle Database 10g Express
Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 -
Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows:
Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 -
Production
I am having an issue in Updating the column in a Table.......
What i am trying to do is ...Compare 2 column and then update one of the compared column....
Table 1 Name: TEST1 _
bq. LNID \\ NEW_AN8 \\ OLD_AN8 \\ OLD_DESC \\ 2 \\ 123002 \\ 100001 \\ C2370 \\ 125846 \\ 100001 CS24 \\ 123024 \\ 100028 \\ C2392 \\ 125868 \\ 100028 CS25 \\ 123025 \\ 100036 C2393 \\ 125869 \\ 100036 CS26 123026 \\ 100116 \\ C2394 \\ 125870 \\ 100116 \\ CS
TEST2_
SZAN8     SZAN82     SZAN86     SZAT1
123,002 100,001 100,001 C
125,846 100,001 100,001 CS
123,024 100,028 100,028 C
125,868 100,028 100,028 CS
125,869 100,036 100,036 CS
123,025 100,036 100,036 C
125,870 100,116 100,116 CS
123,026 100,116 100,116 C
I wanted to update SZAN82 of TEST2 table..... based on the SZAT1 value ...
I shud be able to pick the CS type record first then the C type record and the SZAN82 value and check whether it is present in the TEST1 table if it present then I shud update the AN82 value,,
UPDATE LPLSCHEMA.LPL_F0101Z2_CUSTOMER C SET (SZAN82)=
(SELECT NEW_AN8 FROM LPL_CROSS_CUSTOMER B,LPL_F0101Z2_CUSTOMER C WHERE C.SZAT1='CS' AND B.OLD_DESC='CS'and C.szan82=B.old_an8);
I tried like tis .... i got an Error sub query more than one rows ...
Thanks in Advance !!
Ananda
Edited by: Ananda on Jan 2, 2009 6:30 PM
Edited by: Ananda on Jan 2, 2009 6:30 PM
Edited by: Ananda on Jan 2, 2009 6:34 PM
Edited by: Ananda on Jan 2, 2009 6:37 PM

Answer 1

Or:
UPDATE  LPLSCHEMA.LPL_F0101Z2_CUSTOMER C
  SET   SZAN82 = (
                  SELECT  NEW_AN8
                    FROM  LPL_CROSS_CUSTOMER B
                    WHERE C.SZAT1='CS'
                    AND B.OLD_DESC='CS'
                    AND C.szan82=B.old_an8
  WHERE (SZAT1,szan82) IN (
                            SELECT  'CS',
                                    old_an8
                              FROM  LPL_CROSS_CUSTOMER B
                              WHERE B.OLD_DESC='CS'
                          );Or, depending on your version and table structure:
UPDATE  (
         SELECT  C.SZAN82,
                 B.NEW_AN8
           FROM  LPL_CROSS_CUSTOMER B,
                 LPL_F0101Z2_CUSTOMER c
                 WHERE C.SZAT1='CS'
                 AND B.OLD_DESC='CS'
                 AND C.szan82=B.old_an8
  SET   SZAN82 = NEW_AN8
/SY.