Update table with select from another table

Hallo,
I'd like to update table b with codes from a mapping table a.
a has:
town_id, town_code, town_name
b has town_code, town_id, town_population, town_zip_code,...
Table a has all the details - town_id, town_code and town_name and acts as the mapping between town_id and town_code
In table b, town_code is null. I want to update the column b.town_code with town_code from table a where a.town_id = b.town_id.
How will the update query look like?
I tried
UPDATE B SET town_code = (SELECT A.town_code FROM A,B WHERE A.town_id=B.town_id)
and I get the error 'single-row subquery returns more than one row'
Will appreciate your assistance

This is what I did.
First, I created and populated the TOWN_INFO table:
CREATE TABLE "TOWN_INFO"
(     "TOWN_ID" NUMBER,
     "TOWN_CODE" NUMBER,
     "E_MAIL" CHAR(15 BYTE)
Table Created.
insert all
into TOWN_INFO (TOWN_ID, E_MAIL) values (3024,'[email protected]')
into TOWN_INFO (TOWN_ID, E_MAIL) values (3040,'[email protected]')
into TOWN_INFO (TOWN_ID, E_MAIL) values (3052,'[email protected]')
into TOWN_INFO (TOWN_ID, E_MAIL) values (3065,'[email protected]')
into TOWN_INFO (TOWN_ID, E_MAIL) values (3066,'[email protected]')
select * from dual
5 rows created.
The following creates and populates the mapping table:
CREATE TABLE "TOWN_MAPP"
(     "TOWN_CODE" NUMBER,
     "TOWN_ID" VARCHAR2(255 BYTE),
     "TOWN_NAME" CHAR(6 BYTE)
insert all
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3024,'1001','TOWN_1')
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3040,'1003','TOWN_3')
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3052,'1002','TOWN_2')
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3065,'1004','TOWN_4')
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3066,'1006','TOWN_6')
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3088,'1007','TOWN_7')
into TOWN_MAPP (TOWN_ID,TOWN_CODE, TOWN_NAME) values (3020,'1009','TOWN_9')
select * from dual
7 rows created.
And now the update query:
UPDATE TOWN_INFO
SET TOWN_CODE=(SELECT B.TOWN_CODE FROM TOWN_MAPP B, TOWN_INFO C
WHERE B.TOWN_ID=B.TOWN_ID)
SET TOWN_CODE=(SELECT B.TOWN_CODE FROM TOWN_MAPP B, TOWN_INFO C
ERROR at line 2:
ORA-01427: single-row subquery returns more than one row
Thanx in advance
Edited by: user9954260 on Apr 13, 2010 7:40 AM
Edited by: user9954260 on Apr 13, 2010 7:44 AM

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