Swapping two integers in a single statement.

Hi All
Is it possible to swap two integer values in a single statement.
Help me out.
Thanks in anticipation

You want one statement? That would be something like
this, then:x+=(y=-(y-(x-=y)));You are
welcome to test it, I don't wish to be associated with
it in any way.Doesn't work because the initial value of x is stored right at the beginning, and then used as the operand of the += at the end of the expression evaulation.
However, following the same line of thinking I recast it into something that did work, using += and -=, and finally into this form, which also works.
x=(x^=y)^(y^=x)Which is all very well, but generates more code than simply using a temporary variable, and would have to be documented on every occurrence to explain that this really was a swap. I'm at a loss to see how this is better than
int t; t=x; x=y; y=tThey both fit on one line.
Sylvia.

Similar Messages

TWO ERRO ORA-01427: single-row subquery returns more than one row

Hi,
I have a procedure which contains a cursor. If i run the select statement in the cursor separetly, it returns only value and works fine. But the same select statement in the cursor of a procedure throws me the error as below:
TWO ERRO ORA-01427: single-row subquery returns more than one row
Not sure what going on...any help appreciated.
Below is the select statement:
SELECT DISTINCT PSE.PARENT_POSITION_ID,
(SELECT DISTINCT PPD1.SEGMENT2
FROM PER_POSITION_DEFINITIONS PPD1,
HR_ALL_POSITIONS_F HAPF2,
PER_POS_STRUCTURE_ELEMENTS PSE2
WHERE TRUNC(SYSDATE) BETWEEN
HAPF2.EFFECTIVE_START_DATE AND
HAPF2.EFFECTIVE_END_DATE
AND PPD1.POSITION_DEFINITION_ID =
HAPF2.POSITION_DEFINITION_ID
AND
HAPF2.POSITION_ID = PSE2.PARENT_POSITION_ID
AND PSE2.PARENT_POSITION_ID =
PSE.PARENT_POSITION_ID
AND ROWNUM = 1) SEGMENT2,
(SELECT DISTINCT PAPF1.FIRST_NAME || ' ' ||
PAPF1.LAST_NAME CHIEF_NAME
FROM PER_ALL_PEOPLE_F PAPF1,
PER_ALL_ASSIGNMENTS_F PAAF1
WHERE TRUNC(SYSDATE) BETWEEN
PAPF1.EFFECTIVE_START_DATE AND
PAPF1.EFFECTIVE_END_DATE
AND TRUNC(SYSDATE) BETWEEN
PAAF1.EFFECTIVE_START_DATE AND
PAAF1.EFFECTIVE_END_DATE
AND PAAF1.POSITION_ID = PSE.PARENT_POSITION_ID
AND PAPF1.PERSON_ID = PAAF1.PERSON_ID
AND ROWNUM = 1) CHIEF_NAME
FROM PER_POS_STRUCTURE_ELEMENTS PSE,
HR_ALL_POSITIONS_F HAPF,
PER_POSITION_DEFINITIONS PPD
WHERE PSE.SUBORDINATE_POSITION_ID = 52744
AND TRUNC(SYSDATE) BETWEEN HAPF.EFFECTIVE_START_DATE AND
HAPF.EFFECTIVE_END_DATE
AND HAPF.POSITION_ID = PSE.SUBORDINATE_POSITION_ID
AND HAPF.POSITION_DEFINITION_ID = PPD.POSITION_DEFINITION_ID;
Thanks
PK
Edited by: user539616 on Jun 30, 2009 6:30 PM

Hi,
The cursor has a different parameter? Maybe the query is not exactly the same. Could you check this?
This is your query (formatted):
SELECT DISTINCT PSE.PARENT_POSITION_ID,
                (SELECT DISTINCT PPD1.SEGMENT2
                   FROM PER_POSITION_DEFINITIONS   PPD1,
                        HR_ALL_POSITIONS_F         HAPF2,
                        PER_POS_STRUCTURE_ELEMENTS PSE2
                  WHERE TRUNC(SYSDATE) BETWEEN HAPF2.EFFECTIVE_START_DATE AND
                        HAPF2.EFFECTIVE_END_DATE
                    AND PPD1.POSITION_DEFINITION_ID = HAPF2.POSITION_DEFINITION_ID
                    AND HAPF2.POSITION_ID = PSE2.PARENT_POSITION_ID
                    AND PSE2.PARENT_POSITION_ID = PSE.PARENT_POSITION_ID
                    AND ROWNUM = 1) SEGMENT2,
                (SELECT DISTINCT PAPF1.FIRST_NAME || ' ' || PAPF1.LAST_NAME CHIEF_NAME
                   FROM PER_ALL_PEOPLE_F      PAPF1,
                        PER_ALL_ASSIGNMENTS_F PAAF1
                  WHERE TRUNC(SYSDATE) BETWEEN PAPF1.EFFECTIVE_START_DATE AND
                        PAPF1.EFFECTIVE_END_DATE
                    AND TRUNC(SYSDATE) BETWEEN PAAF1.EFFECTIVE_START_DATE AND
                        PAAF1.EFFECTIVE_END_DATE
                    AND PAAF1.POSITION_ID = PSE.PARENT_POSITION_ID
                    AND PAPF1.PERSON_ID = PAAF1.PERSON_ID
                    AND ROWNUM = 1) CHIEF_NAME
FROM PER_POS_STRUCTURE_ELEMENTS PSE,
       HR_ALL_POSITIONS_F         HAPF,
       PER_POSITION_DEFINITIONS   PPD
WHERE PSE.SUBORDINATE_POSITION_ID = 52744
   AND TRUNC(SYSDATE) BETWEEN HAPF.EFFECTIVE_START_DATE AND HAPF.EFFECTIVE_END_DATE
   AND HAPF.POSITION_ID = PSE.SUBORDINATE_POSITION_ID
   AND HAPF.POSITION_DEFINITION_ID = PPD.POSITION_DEFINITION_ID;Tips: To put formatted code you must use {noformat}{noformat} tags, start tag and end tag are the same,you don't need to put '/' in the close tag.
Regards,

Update multiple rows & columns using a single statement

I have the following table with tablename - emp
first_name last_name age
aaa bbb 31
56
78
ggg hhh 36
2nd & 3rd row contain null values (no data) in first_name & last_name column . I want to update those two rows with data using a single statement. How do I do it?
I was thinking may be something like the following:-
UPDATE emp
SET first_name= , last_name=
CASE
WHEN age = 56 THEN 'ccc', 'ddd'
WHEN age = 78 THEN 'eee', 'fff'
ELSE first_name, last_name
END
-----------------------------------------------

Can you give an example of a nested decode statement.
test@ora>
test@ora>
test@ora> --
test@ora> drop table t;
Table dropped.
test@ora> create table t as
2 select rownum x, cast(null as varchar2(10)) y from all_objects
3 where rownum <= 10;
Table created.
test@ora>
test@ora> select x, y from t;
         X Y
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
10 rows selected.
test@ora>
test@ora> -- You want to change the values of y to 'a' through 'j' for x = 1 through 10
test@ora> -- and y = 'X' otherwise
test@ora> --
test@ora> -- Let's say the limit on the number of components were 12
test@ora> -- Then your decode statement would've been:
test@ora> --
test@ora> update t
2 set y = decode(x,
3                 1, 'a',
4                 2, 'b',
5                 3, 'c',
6                 4, 'd',
7                 5, 'e',
8                    'f');
10 rows updated.
test@ora>
test@ora>
test@ora> select x, y from t;
         X Y
         1 a
         2 b
         3 c
         4 d
         5 e
         6 f
         7 f
         8 f
         9 f
        10 f
10 rows selected.
test@ora>
test@ora> -- As you can see you are unable to:
test@ora> --
test@ora> -- change y to 'g' if x = 7
test@ora> -- change y to 'h' if x = 8
test@ora> -- change y to 'i' if x = 9
test@ora> -- change y to 'j' if x = 10
test@ora> -- change y to 'X' otherwise
test@ora> --
test@ora>
test@ora> -- What you would do then is -
test@ora> -- (i) Let the 11 components remain as they are and
test@ora> -- (ii) Introduce a nested decode function *AS THE 12TH COMPONENT*
test@ora> --
test@ora>
test@ora> rollback;
Rollback complete.
test@ora>
test@ora> --
test@ora> update t
2 set y = decode(x,
3                 1, 'a',
4                 2, 'b',
5                 3, 'c',
6                 4, 'd',
7                 5, 'e',
8                 decode(x,
9                        6, 'f',
10                        7, 'g',
11                        8, 'h',
12                        9, 'i',
13                        10, 'j',
14                            'X')
15                );
10 rows updated.
test@ora>
test@ora> select x, y from t;
         X Y
         1 a
         2 b
         3 c
         4 d
         5 e
         6 f
         7 g
         8 h
         9 i
        10 j
10 rows selected.
test@ora>
test@ora>HTH
isotope
Extrapolate that to 255 components and you get 254 + 255 = 509 components. And so on...
Message was edited by:
isotope

Merging two records in a single record for the same matnr,werks and bwart.

Hi I have a requirement to merge two records into one single record using the quantity field from MSEG table.
I am selecting two records from the table MSEG. Now for these two records i have to add the quantity values into one variable.
Then there should be only one record for the same matnr,werks,bwart.
Any suggestion would be appreciated.
Regards,
Amit

hi,
You can COLLECT statement only if all non key fields are numeric.
This statement Adds all such fields and give us a single record.
Regards
Sumit Agarwal

Single-statement 'write consistency' on read committed?

Please note that in the following I'm only concerned about single-statement read committed transactions. I do realize that for a multi-statement read committed transaction Oracle does not guarantee transaction set consistency without techniques like select for update or explicit hand-coded locking.
According to the documentation Oracle guarantees 'statement-level transaction set consistency' for queries in read committed transactions. In many cases, Oracle also provides single-statement write consistency. However, when an update based on a consistent read tries to overwrite changes committed by other transactions after the statement started, it creates a write conflict. Oracle never reports write conflicts on read committed. Instead, it automatically handles them based on the new values for the target table columns referenced by the update.
Let's consider a simple example. Again, I do realize that the following design might look strange or even sloppy, but the ability to produce a quality design when needed is not an issue here. I'm simply trying to understand the Oracle's behavior on write conflicts in a single-statement read committed transaction.
A valid business case behind the example is rather common - a financial institution with two-stage funds transfer processing. First, you submit a transfer (put transfer amounts in the 'pending' column of the account) in case the whole financial transaction is in doubt. Second, after you got all the necessary confirmations you clear all the pending transfers making the corresponding account balance changes, resetting pending amount and marking the accounts cleared by setting the cleared date. Neither stage should leave the data in inconsistent state: sum (amount) for all rows should not change and the sum (pending) for all rows should always be 0 on either stage:
Setup:
create table accounts
acc int primary key,
amount int,
pending int,
cleared date
Initially the table contains the following:
ACC AMOUNT PENDING CLEARED
1 10 -2
2 0 2
3 0 0 26-NOV-03
So, there is a committed database state with a pending funds transfer of 2 dollars from acc 1 to acc 2. Let's submit another transfer of 1 dollar from acc 1 to acc 3 but do not commit it yet in SQL*Plus Session 1:
update accounts
set pending = pending - 1, cleared = null where acc = 1;
update accounts
set pending = pending + 1, cleared = null where acc = 3;
ACC AMOUNT PENDING CLEARED
1 10 -3
2 0 2
3 0 1
And now let's clear all the pending transfers in SQL*Plus Session 2 in a single-statement read-committed transaction:
update accounts
set amount = amount + pending, pending = 0, cleared = sysdate
where cleared is null;
Session 2 naturally blocks. Now commit the transaction in session 1. Session 2 readily unblocks:
ACC AMOUNT PENDING CLEARED
1 7 0 26-NOV-03
2 2 0 26-NOV-03
3 0 1
Here we go - the results produced by a single-statement transaction read committed transaction in session 2, are inconsistent � the second funds transfer has not completed in full. Session 2 should have produced the following instead:
ACC AMOUNT PENDING CLEARED
1 7 0 26-NOV-03
2 2 0 26-NOV-03
3 1 0 26-NOV-03
Please note that we would have gotten the correct results if we ran the transactions in session 1 and session 2 serially. Please also note that no update has been lost. The type of isolation anomaly observed is usually referred to as a 'read skew', which is a variation of 'fuzzy read' a.k.a. 'non-repeatable read'.
But if in the session 2 instead of:
-- scenario 1
update accounts
set amount = amount + pending, pending = 0, cleared = sysdate
where cleared is null;
we issued:
-- scenario 2
update accounts
set amount = amount + pending, pending = 0, cleared = sysdate
where cleared is null and pending <> 0;
or even:
-- scenario 3
update accounts
set amount = amount + pending, pending = 0, cleared = sysdate
where cleared is null and (pending * 0) = 0;
We'd have gotten what we really wanted.
I'm very well aware of the 'select for update' or serializable il solution for the problem. Also, I could present a working example for precisely the above scenario for a major database product, providing the results that I would consider to be correct. That is, the interleaving execution of the transactions has the same effect as if they completed serially. Naturally, no extra hand-coded locking techniques like select for update or explicit locking is involved.
And now let's try to understand what just has happened. Playing around with similar trivial scenarios one could easily figure out that Oracle clearly employs different strategies when handling update conflicts based on the new values for the target table columns, referenced by the update. I have observed the following cases:
A. The column values have not changed: Oracle simply resumes using the current version of the row. It's perfectly fine because the database view presented to the statement (and hence the final state of the database after the update) is no different from what would have been presented if there had been no conflict at all.
B. The row (including the columns being updated) has changed, but the predicate columns haven't (see scenario 1): Oracle resumes using the current version of the row. Formally, this is acceptable too as the ANSI read committed by definition is prone to certain anomalies anyway (including the instance of a 'read skew' we've just observed) and leaving behind somewhat inconsistent data can be tolerated as long as the isolation level permits it. But please note - this is not a 'single-statement write consistent' behavior.
C. Predicate columns have changed (see scenario 2 or 3): Oracle rolls back and then restarts the statement making it look as if it did present a consistent view of the database to the update statement indeed. However, what seems confusing is that sometimes Oracle restarts when it isn't necessary, e.g. when new values for predicate columns don't change the predicate itself (scenario 3). In fact, it's bit more complicated � I also observed restarts on some index column changes, triggers and constraints change things a bit too � but for the sake of simplicity let's no go there yet.
And here come the questions, assuming that (B) is not a bug, but the expected behavior:
1. Does anybody know why it's never been documented in detail when exactly Oracle restarts automatically on write conflicts once there are cases when it should restart but it won't? Many developers would hesitate to depend on the feature as long as it's not 'official'. Hence, the lack of the information makes it virtually useless for critical database applications and a careful app developer would be forced to use either serializable isolation level or hand-coded locking for a single-statement update transaction.
If, on the other hand, it's been documented, could anybody please point me to the bit in the documentation that:
a) Clearly states that Oracle might restart an update statement in a read committed transaction because otherwise it would produce inconsistent results.
b) Unambiguously explains the circumstances when Oracle does restart.
c) Gives clear and unambiguous guidelines on when Oracle doesn't restart and therefore when to use techniques like select for update or the serializable isolation level in a single-statement read committed transaction.
2. Does anybody have a clue what was the motivation for this peculiar design choice of restarting for a certain subset of write conflicts only? What was so special about them? Since (B) is acceptable for read committed, then why Oracle bothers with automatic restarts in (C) at all?
3. If, on the other hand, Oracle envisions the statement-level write consistency as an important advantage over other mainstream DBMSs as it clear from the handling of (C), does anybody have any idea why Oracle wouldn't fix (B) using well-known techniques and always produce consistent results?

I intrigued that this posting has attracted so little interest. The behaviour described is not intuitive and seems to be undocumented in Oracle's manuals.
Does the lack of response indicate:
(1) Nobody thinks this is important
(2) Everybody (except me) already knew this
(3) Nobody understands the posting
For the record, I think it is interesting. Having spent some time investigating this, I believe the described is correct, consistent and understandable. But I would be happier if Oracle documented in the Transaction sections of the Manual.
Cheers, APC

Can you really update two tables in one SQL statement

Ok a post in the forum has got me awefully curious:
Can you update two tables in one update statement i.e something like this
update table a , b
set b.<column> = something
a.<column> = something
Something to this effect.
If you are curious to know what post I am talking about it is called "updating a single row"

No. You can only update one table in one SQL statement.

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Hi all,
I want to dispaly two screens in a single with as-usual properties.
Please give your suggestions with steps.
Thansk in advance,
Regards,
Balaaji.

hi balaji ,
create a main screen and in which create two sub screens . like this .
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TABLES: USR02,       "Logon data
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SELECTION-SCREEN END OF BLOCK B2.
SELECTION-SCREEN END OF SCREEN 200.
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SELECTION-SCREEN BEGIN OF BLOCK B3 WITH FRAME TITLE TEXT-030.
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SELECTION-SCREEN END OF BLOCK B3.
SELECTION-SCREEN END OF SCREEN 300.
STANDARD SELECTION SCREEN FOR SCROLLING LEFT AND RIGHT
SELECTION-SCREEN: FUNCTION KEY 1,
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SELECTION-SCREEN: BEGIN OF TABBED BLOCK SUB FOR 15 LINES,
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START-OF-SELECTION.
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END-OF-SELECTION.
INITIALIZATION.
SCREEN ICON LEFT AND RIGHT
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AT SELECTION-SCREEN.
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       ELSEIF SSCRFIELDS-UCOMM = 'FC02'.
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     WHEN 200.
       IF SSCRFIELDS-UCOMM = 'FC01'.
         SUB-DYNNR = 100.
       ELSEIF SSCRFIELDS-UCOMM = 'FC02'.
         SUB-DYNNR = 300.
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     WHEN 300.
       IF SSCRFIELDS-UCOMM = 'FC01'.
         SUB-DYNNR = 200.
       ELSEIF SSCRFIELDS-UCOMM = 'FC02'.
         SUB-DYNNR = 100.
       ENDIF.
   ENDCASE.
regard,
sandeep patel
reward point if helpful

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Hi Experts,
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Hello All,
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Regards,
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Hi Sreenivas,
> Is it possible to update two tables using the Update Statement without using Stored Procedures.
Yes its possible through join statement
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Update in JDBC Sender adapter for more than one table
data from 2 tables for jdbc sender adapter
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Ramesh

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http://help.sap.com/saphelp_nw70/helpdata/EN/80/1a670fe07211d2acb80000e829fbfe/frameset.htm
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b07849c7-3a5b-2b10-7586-c431d300a578
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/20a709c1-0a8e-2a10-21b4-f779728c63bf
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/people/kamal.khanna/blog/2008/07/09/managing-data-of-most-valuable-asset-of-an-organization-employees
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How to Insert two queries in a single workbook in BI 7 ?

Hi,
I am trying to insert two queries in a single workbook. The queries are of Accounts Receivable.I have inserted one query in a workbook , but am not able to proceed to inserting the second query. In BEx analyzer, in design mode , using analysis grid , i tried inserting the second query but when saving and running, i am getting message " Variables are present, change their values " . should i maintain same variables for two queries ? i am stuck up. please explain me as how can this be done.
Roja.

Hi,
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Set the values in the variable screen and click OK.
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Hi Sunil,
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Following syntax is for your reference.
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JCO.Function func = connection.getJCoFunction("ZXXXXXXX");
set the import parameters
Execute it.
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get the data from export / table parameters
Now call the second RFC
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set the import parameters
Execute it.
get the data from export / table parameters
close the connection
Hope this will help you.
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Edited by: Chandra Sekhar Seeli on Jan 13, 2011 2:04 PM

Integrating two iviews in a single page in Portal

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please suggest me if i am missing something.
Thanks,
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hi,
In second view properties, please select ENTRY POINT as Yes, then let me know
Regards
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Combine select and update into single statement,without bind-variable

I have a problem, that I think is not possible to solve the way I want to, but I just wanted to check before leaving the idea...
I am looking for a way to combine the select and the update statement into one single statement. This is what I wan't to achive: select some data, and update the data selected before returning them.
On this site http://www.psoug.org/reference/update.html I see that the following are possible:
var bnd1 NUMBER
var bnd2 VARCHAR2(30)
var bnd3 NUMBER
UPDATE employees
SET job_id ='SA_MAN', salary = salary + 1000,
department_id = 140
WHERE last_name = 'Jones'
RETURNING salary*0.25, last_name, department_id
INTO :bnd1, :bnd2, :bnd3;
I need to have this as a single statement, and cannot use bind-variables. So I was hoping that something like this could be possible:
UPDATE customer c
SET c.HAS_CREDIT ='1'
WHERE c.HAS_CREDIT = '0'
RETURNING c.CUSTOMER_NO, c.FIRSTNAME, c.LASTNAME
where c.HAS_CREDIT = '1'
But this doesn't compile, complaining of missing into (ORA-00925: missing INTO keyword). And even though I would like this to be possible because this would solve my current problem, I think it would be very confusing. For instance; would the where clause of the returning part be operating after the update or before?
Any comments or suggestions on how to get it work in a single statement, or should I just leave this path straight away?

Hi,
RETURNING only works with bind variables, see
http://download-uk.oracle.com/docs/cd/B19306_01/appdev.102/b14261/returninginto_clause.htm#sthref3006
The real problem is that the form of RETURNING clause with bind variables is only valid for single row update or insert statements.
To update (or insert) multiple rows and return the data, you will need to use
RETURNING BULK COLLECT INTO clause. See
http://download-uk.oracle.com/docs/cd/B19306_01/appdev.102/b14261/tuning.htm#sthref2236
Cheers,
Colin

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