| update table attribute help! [message #689617] |
Thu, 22 February 2024 10:27  |
 |
ramys
Messages: 1
Registered: February 2024
|
Junior Member |
|
|
Hi,
I need help please. I am loving oracle syntax (not really). I am unable to update attribute from another table using below.
It doesn't show an error but didn't update "id"
It works only when I hard code values.
Update MyTable a
Set a.ID =
(select b.objid from SourceTable b
where b.DESCRIPTION= trim(a.description)
and a.id =76
)
where a.id =76;
commit;
|
|
|
|
| Re: update table attribute help! [message #689618 is a reply to message #689617] |
Thu, 22 February 2024 10:46  |
 |
Michel Cadot
Messages: 68647
Registered: March 2007
Location: Nanterre, France, http://...
|
Senior Member
Account Moderator |
|
|
Welcome to the forum.
Not sure what you want exactly and what are the relations between the 2 tables but this is something like:
merge
into MyTable a
using SourceTable b
on ( b.DESCRIPTION = trim(a.description) /* and b.id = a.id ? */ )
when matched then update set id = b.objid
/
And the moderator bit:
Always post your Oracle version, with 4 decimals (query v$version), as often solution depends on it.
With any SQL or PL/SQL question, please, post a working Test case: create table (including all constraints) and insert statements along with the result you want with these data then we will be able work with your tables and data. Explain with words and sentences the rules that lead to this result.
[Updated on: Fri, 23 February 2024 00:56] Report message to a moderator |
|
|
|
| Re: update table attribute help! [message #689620 is a reply to message #689617] |
Thu, 22 February 2024 11:25 |
John Watson
Messages: 8931
Registered: January 2010
Location: Global Village
|
Senior Member |
|
|
Which release are you using? If 23c, you have the "Direct Joins for UPDATE and DELETE Statements" capability. Something like this:FREE>
FREE> select * from emp order by deptno;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
--------------- ---------- --------- --------------- --------- --------------- --------------- ---------------
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7839 KING PRESIDENT 17-NOV-81 5000 10
7934 MILLER CLERK 7782 23-JAN-82 1300 10
7566 JONES MANAGER 7839 02-APR-81 2975 20
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7369 SMITH CLERK 7902 17-DEC-80 800 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7900 JAMES CLERK 7698 03-DEC-81 950 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
14 rows selected.
FREE> update emp e set e.ename=d.dname
from dept d
where e.deptno=d.deptno
and d.loc='DALLAS'; 2 3 4
5 rows updated.
FREE> select * from emp order by deptno;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
--------------- ---------- --------- --------------- --------- --------------- --------------- ---------------
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7839 KING PRESIDENT 17-NOV-81 5000 10
7934 MILLER CLERK 7782 23-JAN-82 1300 10
7566 RESEARCH MANAGER 7839 02-APR-81 2975 20
7902 RESEARCH ANALYST 7566 03-DEC-81 3000 20
7876 RESEARCH CLERK 7788 23-MAY-87 1100 20
7369 RESEARCH CLERK 7902 17-DEC-80 800 20
7788 RESEARCH ANALYST 7566 19-APR-87 3000 20
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7900 JAMES CLERK 7698 03-DEC-81 950 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
14 rows selected.
FREE>
|
|
|
|
| Re: update table attribute help! [message #689621 is a reply to message #689617] |
Thu, 22 February 2024 21:57 |
flyboy
Messages: 1903
Registered: November 2006
|
Senior Member |
|
|
Just for completeness, as the posted methods seem better (although the "Direct Joins for UPDATE and DELETE Statements" syntax seems weird to me), you were close to the corellated subquery, as described e.g. here: https://oracle-base.com/articles/misc/updates-based-on-queries
Update MyTable a
Set a.ID =
(select b.objid from SourceTable b
where b.DESCRIPTION= trim(a.description)
and a.id = b.id
)
where exists (
select b.objid from SourceTable b
where b.DESCRIPTION= trim(a.description)
and a.id = b.id
); |
|
|
|
] 
Blog
Search
Help
Members
Register
Login
Home
