Update with subquery in TopLink ?

I want to activate the user account updating its status to ACTIVE.
UPDATE PujUserEntity as user SET user.status.id = (SELECT status.id from PujUserStatusEntity status WHERE status.tag='ACTIVE') WHERE user.login= :login AND user.email= :email
the error during the deployment on Glassfish (TopLink):
CLI171 Command deploy failed : Deploying application in domain failed;
Exception Description: Syntax error parsing the query [activateUserAccount: UPDATE PujUserEntity as user SET user.status.id = (SELECT status.id from PujUserStatusEntity status WHERE status.tag='ACTIVE') WHERE user.login= :userLogin AND user.email= :userEmail], line 1, column 52: unexpected token [SELECT].
Internal Exception: line 1:52: unexpected token: SELECT

According to JPA specification you are not allowed to use subquery in that place. In SET part you can only use simple_arithmetic_expression | string_primary | datetime_primary | boolean_primary | enum_primary | simple_entity_expression | NULL (JSR 220 Java Persistence API specification page 104). You should be able to use native query, or find status.id first and then just pass it as parameter.

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Merge Vs Update with Subquery

What is the main difference between Merge Statment(only update) with simple Update statement based on Select query ?
Which one is faster ?

There are no vanilla answers to such a question especially when asked by someone who doesn't have time to post version number or DML.
The only honest answer ... build a test environment and test it using EXPLAIN PLAN and SET TIMING ON.
That said: A merge statement should only be used where it is appropriate.

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I want to update a table with data extracted from a xmltype.
But Oracle extracts only the first value from the subquery.
Am I missing something or this is the expected output...
drop table t
create table t(id number, val varchar2(20));
insert into t(id, val) values (1, null)
insert into t(id, val) values (2, null)
select *
from t
ID     VAL
1
2
update t set(val) =
(select t.id from dual)
where id = t.id
select *
from t
ID     VAL
1     1
2     2
update t set(val) =
(select extractValue(
               extract(xmltype('<root>'||
                                   '<node id="1">'||
                                   '<value>1</value>'||
                                   '</node>'||
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where id = t.id
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1     1
2     1 -- <-- should be 2!

Hi,
try this way:
SQL> CREATE TABLE tab AS SELECT 1 id,cast(NULL AS VARCHAR2(20)) val FROM dual UNION ALL
2                      SELECT 2,NULL FROM dual;
Table created.
SQL> DESC tab;
Name                                      Null?    Type
ID                                                 NUMBER
VAL                                                VARCHAR2(20)
SQL>
SQL> SELECT * FROM tab;
        ID VAL
         1
         2
SQL>
SQL> UPDATE tab t
2 SET val=(
3      SELECT
4         extractValue(
5            extract(
6               XMLType('<root>
7                          <node id="1">
8                            <value>1</value>
9                          </node>
10                          <node id="2">
11                            <value>2</value>
12                          </node>
13                        </root>')
14               ,'/root/node[@id='||id||']')
15            ,'/node/value') va
16      FROM tab s
17    WHERE t.id=s.id) ;
2 rows updated.
SQL> SELECT * FROM tab;
        ID VAL
         1 1
         2 2
SQL> spool off;btw, you don't need to || every line in xml, and you don't need to do to_char() when using ||
Ants

Insert / update with subquery

Hi,
i have to insert (if records don't exist) or update (if records already exist) records from table S into table D. S and D have the same structure.
Table S
ID NUMBER, Primary Key,
DESC1 VARCHAR
DESC2 VARCHAR
Table D
ID NUMBER, Primary Key,
DESC1 VARCHAR
DESC2 VARCHAR
Are this statements OK?
INSERT INTO D
( SELECT * FROM S T1 WHERE NOT EXISTS
( SELECT '1' FROM D T2 WHERE T2.ID = T1.ID));
UPDATE D T1
SET (DESC1, DESC2) =
(SELECT DESC1, DECS2
FROM S T2 WHERE T1.ID = T2.ID ) WHERE EXIST
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Thanks a lot

Depends on exist or not the data in
the destination where id doesn't exists in the source.
SQL> select * from updatable_tab;
ID DESC1 DESC2
1 0 0
1 0 0
1 0 0
1 0 0
2 f f
2 f f
2 f f
2 f f
2 f f
9 rows selected.
SQL> update updatable_tab dst set (desc1, desc2) =
2 (select desc1, desc2 from s where s.id = dst.id)
3 /
9 rows updated.
SQL> select * from updatable_tab;
ID DESC1 DESC2
1 A A
1 A A
1 A A
1 A A
2 B B
2 B B
2 B B
2 B B
2 B B
9 rows selected.
But if you have the row in the destination table
wich does not exists in the source table, it will
nullify your dest1 and dest2.
In this case you should of course:
SQL> select * from updatable_tab;
ID DESC1 DESC2
1 0 0
1 0 0
1 0 0
1 0 0
2 f f
2 f f
2 f f
2 f f
2 f f
3 m m
10 rows selected.
SQL> select * from s;
ID DESC1 DESC2
1 A A
2 B B
SQL> update updatable_tab dst set (desc1, desc2) =
2 (select desc1, desc2 from s where s.id = dst.id)
3 where exists (select null from s where s.id = dst.id)
4 /
9 rows updated.
SQL> select * from updatable_tab;
ID DESC1 DESC2
1 A A
1 A A
1 A A
1 A A
2 B B
2 B B
2 B B
2 B B
2 B B
3 m m
Rgds.

Update with exists and subquery

Hi how to pass index to this sql
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PK(eqid,seq,histseq) and indx (docno)
table pa ( eqid,seq,docno,status,value1,value2)
PK(eqid,seq) and indx (docno)
update pa
set (value1,value2) = (select pap.value1,pap.value2 from pap
where pap.eqid = pa.eqid
and pap.seq = pa.seq
and pap.histseq =1
and pap.docno <> pa.docno
and pap.status = 4 )
where pa.status=1
and exists ( select 1 from pap
where pap.eqid = pa.eqid
and pap.seq = pa.seq
and pap.histseq =1
and pap.docno <> pa.docno
and pap.status =4 )
It is doing fulltable scan on pa and using hash join .
How to write update with subquery method also ?

There's nothing wrong with a full scan.
Please read this explanation/example: http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:9422487749968
If you want more explanation then please follow these guidelines below, so we have sufficient inputs:
[When your query takes too long...|http://forums.oracle.com/forums/thread.jspa?messageID=1812597#1812597]
[How to post a SQL statement tuning request|http://forums.oracle.com/forums/thread.jspa?threadID=863295&tstart=0]
Remember to put the tag befor and after the examples you post.
See http://forums.oracle.com/forums/help.jspa regarding tags.

Update column with subquery returning more than one row

Hi Everybody,
Please let me know how to handle this. I am writing update statement in procedure with subquery and it is returning multiple rows. Please help me, how i can handle this :
UPDATE TABLEA A
SET A.ERROR_MESSAGE = (Select B.XERROR_MESSAGE from TABLEB B, TABLEA A WHERE B.id = A.id)
WHERE A.id = (Select B.id from TABLEB B, TABLEA A WHERE B.id = A.id);
(Select B.XERROR_MESSAGE from TABLEB B, TABLEA A WHERE B.id = A.id) --- This subquery is returning more than one rows. How i can handle this in Pl/SQL?
Please let me know. I will be very thankful to you all.
I will really appreciate your replies and comments.
Thank you

Try getting rid of tablea in your subqueries. You already have it in the UPDATE statement.
UPDATE TABLEA A
SET    A.ERROR_MESSAGE = (Select B.XERROR_MESSAGE
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using tableb b
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Hi,
We are upgrading the 10g code to 11g, where one process has the DB polling with custom SQQL. This SQL has a subquery like,
Select Name, ID, CID from tabl1 where lastdate + (select num_value from table2 where column2 = "xxx") <= sysdate
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Hi,
Not sure about your question.
But you say when you uss 01-apr-10 you get the expected results.
So why dont you try using trunc on botht sides
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FROM vps_fishery_ner vfn, valid_fishery vf
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IN answer to your question why it does not return with subquery included, because the TIME PART is not the same.
You yourself proved it by using the supplying only the date part.
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Update with Outer Join

Is it possible to do an update that involves an outer join on the table being updated?
Here's what I mean - currently, I have something like:
UPDATE table_1 t1
SET col_1 =
SELECT t2.col_2
FROM table_2 t2
WHERE t2.t1_key = t1.t1_key
WHERE EXISTS
SELECT t2.*
FROM table_2 t2
WHERE t2.t1_key = t1.t1_key
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Is there a way of combining these two updates into a single update statement?

You could simply use your first update and omit the WHERE EXISTS clause since you want to update all the rows in table_1 anyway.
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2 SET    col_1 = nvl (
3                       (SELECT t2.col_2
4                        FROM   table_2 t2
5                        WHERE t2.t2_key = t1.t1_key
6                       ),0
7                     )
8 ;
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SQL> select * from table_1;
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                   7                    0
                   8                    0
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9 rows selected.

Why update with subqueries does not have cost and cardinality?

There is update.
update test t1 set dummy = (select dummy from test2 t2 where t1.id = t2.id);Both tables which have actual statistics. Each has 1000 rows. And column ID have values from 1 to 1000 in each table.
This is explain plan
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | UPDATE STATEMENT   |       | 1000 | 13000 |   426   (9)| 00:00:01 |
|   1 | UPDATE            | TEST |       |       |            |          |
|   2 |   TABLE ACCESS FULL| TEST | 1000 | 13000 |   426   (9)| 00:00:01 |
|* 3 |   TABLE ACCESS FULL| TEST2 |     1 |    13 |   426   (9)| 00:00:01 |
Predicate Information (identified by operation id):
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This is runtime plan
| Id | Operation          | Name | Starts | E-Rows | A-Rows |
|   1 | UPDATE            | TEST |      1 |        |      0 |
|   2 |   TABLE ACCESS FULL| TEST |      1 |   1000 |   1000 |
|* 3 |   TABLE ACCESS FULL| TEST2 |   1000 |      1 |   1000 |
Predicate Information (identified by operation id):
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Does Oracle always not understand that update with subqueries will performed as NL or filter? In other words that step 3 will executed many times.
Or it is my bug (or what?)?

793769 wrote:
Does Oracle always not understand that update with subqueries will performed as NL or filter? In other words that step 3 will executed many times.
Or it is my bug (or what?)?It's not possible to say whether this is a bug or a deliberate choice.
Because of "subquery caching" (see http://jonathanlewis.wordpress.com/2006/11/06/filter-subqueries/ ) the optimizer cannot predict how often the subquery will have to run. So possibly it shows nothing rather than showing the best or worst cases or a pure guess.
Regards
Jonathan Lewis

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