A simple question...Constraints covering more than 1 table

Hello you all,
I got a simple question for a school project I have to do in Oracle. At least I think it will be simple for most people on this forum. But I can't figure it out. (Excuse me for the head title of the thread as well, but I don't know the exact term for this in english )
I can figure out how to do constraints in one table, for example:
'enddate > begindate'
But I got the following situation that I got the 2 following tables:
- Project
- Projectphase
I want to build in a constraint that prevents that the 'enddate' of the table 'Project' has an earlier date than the 'enddate' of the table 'Projectphase' because all projectphases have to be finished before a project can be finished.
I've tried to do this with constructions like 'Pro.Project.Enddate' and 'Pph.Projectphase.Enddate' but that doesn't work out.
So any help will be greatly appreciated.

I think what you want is called a "business rule". It can be implemented by using triggers on the tables, not constraints.
Tim

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SoundPlayer.java
import javax.sound.sampled.*;
import java.net.URL;
import java.util.LinkedList;
import java.util.Vector;
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Hope this solves at least part of your problem.
Hjalti
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CREATE TABLE CTNAPP.ctn_pub_cntl
(ctn_pub_cntl_id          NUMBER(18)
,table_name                  VARCHAR2(50)
,last_pub_tms              DATE
,queue_name               VARCHAR2(50)
,dest_system              VARCHAR2(50)
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,status                      VARCHAR2(8)
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INSERT INTO CTNAPP.ctn_pub_cntl
(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
VALUES
(CTNAPP_SQNC.nextval
,'TRKFCG_SBDVSN'
,TO_DATE('10/2/2004 10:17:44PM','MM/DD/YYYY HH12:MI:SSPM')
,'UT.TSD.TSZ601.UNP'
,'SAP'
,15
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(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
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(CTNAPP_SQNC.nextval
,'TRKFCG_TRACK_SGMNT_DN'
,TO_DATE('02/06/2015 9:50:00AM','MM/DD/YYYY HH12:MI:SSPM')
,'UT.TSD.WRKORD.UNP'
,'SAP'
,30
INSERT INTO CTNAPP.ctn_pub_cntl
(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
VALUES
(CTNAPP_SQNC.nextval
,'TRKFCG_FXPLA_TRACK_LCTN_DN'
,TO_DATE('10/2/2004 10:17:44PM','MM/DD/YYYY HH12:MI:SSPM')
,'UT.TSD.YRDPLN.INPUT'
,'SAP'
,30
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(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
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(CTNAPP_SQNC.nextval
,'TRKFCG_FXPLA_TRACK_LCTN2_DN'
,TO_DATE('02/06/2015 9:50:00AM','MM/DD/YYYY HH12:MI:SSPM')
,'UT.TSD.TSZ601.UNP'
,'SAP'
,120
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(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
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,frequency
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(CTNAPP_SQNC.nextval
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,'UT.TSD.YRDPLN.INPUT'
,'SAP'
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(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
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(CTNAPP_SQNC.nextval
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,'UT.TSD.WRKORD.UNP'
,'SAP'
,10
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(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
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(CTNAPP_SQNC.nextval
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,TO_DATE('03/26/2015 7:50:00AM','MM/DD/YYYY HH12:MI:SSPM')
,'UT.TSD.WRKORD.UNP'
,'SAP'
,30
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(ctn_pub_cntl_id
,table_name
,last_pub_tms
,queue_name
,dest_system
,frequency
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(CTNAPP_SQNC.nextval
,'TRKFCG_OPRLMT_SGMNT_DN'
,TO_DATE('03/28/2015 12:50:00AM','MM/DD/YYYY HH12:MI:SSPM')
,'UT.TSD.WRKORD.UNP'
,'SAP'
,30
COMMIT;
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CREATE OR REPLACE PACKAGE CTNAPP.CTN_PUB_CNTL_EXTRACT_PUBLISH
IS
TYPE tNameTyp IS TABLE OF ctn_pub_cntl.table_name%TYPE INDEX BY BINARY_INTEGER;
g_tName tNameTyp;
TYPE tClobTyp IS TABLE OF CLOB INDEX BY BINARY_INTEGER;
g_tClob tClobTyp;
FUNCTION GetCtnData(p_nInCtnPubCntlID IN CTN_PUB_CNTL.ctn_pub_cntl_id%TYPE,p_count OUT NUMBER ) RETURN tClobTyp;
END CTNAPP.CTN_PUB_CNTL_EXTRACT_PUBLISH;
--Package body
CREATE OR REPLACE PACKAGE BODY CTNAPP.CTN_PUB_CNTL_EXTRACT_PUBLISH
IS
     doc           xmldom.DOMDocument;
     main_node     xmldom.DOMNode;
     root_node     xmldom.DOMNode;
     root_elmt     xmldom.DOMElement;
     child_node    xmldom.DOMNode;
     child_elmt    xmldom.DOMElement;
     leaf_node     xmldom.DOMNode;
     elmt_value    xmldom.DOMText;
     tbl_node      xmldom.DOMNode;
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     l_xmltype     XMLTYPE;
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PROCEDURE BuildCPRHeader IS
BEGIN
    child_elmt := xmldom.createElement(doc, 'PUBLISH_HEADER');
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    elmt_value := xmldom.createTextNode (doc, 'VALUE');
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    leaf_node := xmldom.appendChild (leaf_node, xmldom.makeNode (elmt_value));
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    elmt_value := xmldom.createTextNode (doc, TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS'));
    leaf_node := xmldom.appendChild (child_node, xmldom.makeNode (child_elmt));
    leaf_node := xmldom.appendChild (leaf_node, xmldom.makeNode (elmt_value));
END BuildCPRHeader;
--Get table data based on table name
FUNCTION GetCtnData(p_nInCtnPubCntlID IN CTN_PUB_CNTL.ctn_pub_cntl_id%TYPE,p_Count OUT NUMBER) RETURN tClobTyp IS
    vTblName      ctn_pub_cntl.table_name%TYPE;
    vLastPubTms   ctn_pub_cntl.last_pub_tms%TYPE;
BEGIN
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        INTO   vTblName, vLastPubTms
        FROM   CTN_PUB_CNTL
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        g_vErrorMessage:=SQLERRM|| g_vErrorMessage;
        g_nSqlCd:=SQLCODE;
        ctn_log_error('ERROR',g_vErrorMessage,'SELECT',g_nSqlCd,p_nInCtnPubCntlID,g_vPackageName,g_vProcedureName,g_vTableName);
        WHEN OTHERS THEN
       DBMS_OUTPUT.PUT_LINE('ERROR : ' || SQLERRM);
       ctn_log_error('ERROR',g_vErrorMessage,'OTHERS',g_nSqlCd,p_nInCtnPubCntlID,g_vPackageName,g_vProcedureName,g_vTableName);
END GetCtnData;
PROCEDURE printClob (result IN OUT NOCOPY CLOB) IS
    xmlstr   VARCHAR2 (32767);
    line     VARCHAR2 (2000);
BEGIN
    xmlstr := DBMS_LOB.SUBSTR (result, 32767);
    LOOP
       EXIT WHEN xmlstr IS NULL;
       line := SUBSTR (xmlstr, 1, INSTR (xmlstr, CHR (10)) - 1);
       DBMS_OUTPUT.put_line (line);
       xmlstr := SUBSTR (xmlstr, INSTR (xmlstr, CHR (10)) + 1);
    END LOOP;
END printClob;
END CTN_PUB_CNTL_EXTRACT_PUBLISH;
If you notice my query:
vStrSqlQuery := 'SELECT * FROM ' || vTblName
                      || ' WHERE record_update_tms <= TO_DATE(''' || TO_CHAR(vLastPubTms, 'MM/DD/YYYY HH24:MI:SS') || ''', ''MM/DD/YYYY HH24:MI:SS'') ' ;
                     || ' AND rownum < 16'
The minute I comment
|| ' AND rownum < 16' ;
, it throws an error because this query returns around 600 rows and all of those rows need to be published as XML and the tragedy is that there is a C program in between as well i.e. C will call my packged functions and then will do all the processing. Once this is done will pass the results back to C program. So obviously C does not recognise CLOB and somewhere in the process I have to convert the CLOB to VARCHAR or instead of CLOB I have to use VARCHAR array as a return type. This is my challenge.
Anyone that can help me to find out the required magic number and also a brief know how, I would appreciate that. Many thanks in advance.

Not sure I understand which part is failing.
Is it the C program calling your packaged function? Or does the error occur in the PL/SQL code, in which case you should be able to pinpoint where it's wrong?
A few comments :
1) Using DOM to build XML out of relational data? What for? Use SQL/XML functions.
2) Giving sample data is usually great, but it's not useful here since we can't run your code. We're missing the base tables.
3) This is wrong :
vStrSqlQuery := 'SELECT * FROM ' || vTblName                     || ' WHERE record_update_tms <= TO_DATE(''' || TO_CHAR(vLastPubTms, 'MM/DD/YYYY HH24:MI:SS') || ''', ''MM/DD/YYYY HH24:MI:SS'') ' ;
A bind variable should be used here for the date.
4) This is wrong :
elmt_value := xmldom.createTextNode (doc, l_clob(1));
createTextNode does not support CLOB so it will fail as soon as the CLOB you're trying to pass exceeds 32k.
Maybe that's the problem you're referring to?
5) This is most wrong :
     l_clob(1):=REPLACE(l_clob(1),'<?xml version="1.0"?>', NULL);
     l_clob(1):=REPLACE(l_clob(1),'<', '<');
     l_clob(1):=REPLACE(l_clob(1),'>', '>');
I understand what you're trying to do but it's not the correct way.
You're trying to convert a text() node representing XML in escaped form back to XML content.
The problem is that there are other things to take care of besides just '<' and '>'.
If you want to insert an XML node into an existing document, treat that as an XML node, not as a string.
Anyway,
Anyone that can help me to find out the required magic number
That would be a bad idea. Fix what needs to be fixed.
And please clearly state which part is failing : the C program or the PL/SQL code?
I'd vote for PL/SQL, as pointed out in [4].

How can I enter my podcast in more than one category? Mine covers arts, education and society and culture, but is listed as "Performing Arts". Thank you for your time!

How can I enter my podcast in more than one category, to reflect the fact that it covers arts, education and society and culture? Thank you for your time!

You can have more than one category - this page shows you how the tags are formed:
http://www.apple.com/itunes/podcasts/specs.html#category
The Store will list only the first category and its sub-category at the top of the page. Like the first category, the others will in theory make your podcast available for searching by category. However searching just on the category in the iTunes Store is most unlikely to throw up your podcast. There are thousands of podcasts out there, and it would be quite impossible to display on one page the entire list for any category. What you see are 'featured' podcasts, chosen by Apple as being special; please see this Tech Note:
http://www.apple.com/itunes/podcasts/specs.html#getfeatured
Note that there is no way you can influence the selection other than making your podcast really special.
If you have further questions about making your podcast it's better to ask them in the Producing Podcasts forum.

How to print a graph in which internal table has more than 32 entries?

hiii experts
i am trying to make a line graph using 'gfw_pres_show' function module.
but in report internal table has more than 32 entries
so how can i print a graph having more than 32 entries?

Hi ricky_lv,
According to your description, there is main report and subreport in it, when the subreport spans across multiple pages, you want to show column headers on each page. If that is the case, we can set column headers visible while scrolling in main report.
For detail information, please refer to the following steps:
In design mode, click the small drop down arrow next to Column Groups and select Advanced Mode.
Go to your Row Groups pane, click on the first static member.
In properties grid, set FixData to True.
Set RepeatOnNextPage to True.
Here is a relevant thread you can reference:
https://social.technet.microsoft.com/Forums/en-US/e1f67cec-8fa3-4c5d-86ba-28b57fc4a211/keep-header-rows-visible-while-scrolling?forum=sqlreportingservi
The following screenshots are for your reference:
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu
If you have any feedback on our support, please click
here.
Wendy Fu
TechNet Community Support

Shortest path with more than one traveler and time constraints

Please have a look at this problem...Thank you..
(the problem is ok with one traveler. but when two or more come into the picture they really mess things up)
Here it is
I have a number of destinations that devides evenly up between a
number of travelers. (5 travelers with 20 destinations = 4
destinations each)
All destination can be visited by all travelers but it can ony be visited once
Each destination has to be visited and
each traveler has to visit the same amount of destinations.
The total amount of traveling has to be minimized.
Grid references have been given to work out the distance between each
destination. (the distances have not been worked out prior to the
start of the problem)
The starting point of each traveler is not at any of the destinations
and is different to each other. This point is also known and can be
used to calculate the distance to any destination.
there is an extra part of the problem (which I think I can sort out but if its of interest here it is any way): Each destination can only be
visited at a certain time of the day (ie between 7- 9 and 9-12 and
12-3 and 3-6)
A typical problem would have about 300 destinations and about 50
travelers every day. ie about 6 destination a day per traveler.
Could any one please give me an idea of how you would go about working the
routes out for each traveler that minimizes travelling distance as there is no algorithm that does this kind of routing.
I would really like some help with this one please. I have many ideas of how to do it but i really feel like it is not optimised...
I have to complete this in one week and have no AI experiance ( I would like to do this without AI or anything to do with ant colonies and or swarm optimization)
Thank you.

The reason that the time is in fact a simple constraint is because this is a homework problem and the kids only have a week to work on it. If it were a real world problem you you not conveniently have the number of travelers divide evenly into the number of cities.
If it were not some homework problem you would not have a constraint that reads "Oh by the way, for extra credit, you can only visit some cities at certain times during the day." It would either be a real constraint or not.
The other indication that it is a homework problem is that the student was given a week to do it. I will perhaps be going out on a limb here, but NO reasonable business gives some bozo one week to complete an assignment for which the bozo is so clueless that he has to hit the net and ask random people if they can tell him how to do it.
Had there been any need to model travel time, then velocity of travelers would have been mentioned at some point. If the traveler were actually doing anything in a city, time to load or unload the truck would have been given. And lastly, what real world problem would add a constraint that no two travelers could go to the same city. What if it is shorter to get from A to C by going through B which has already been visited. This constraint was the tip that the solution was a partition of a set of cities.
My gross simplification is merely that this is a homework problem and therfore if I haven't been told otherwise I am free to assume that a traveler moving at infinite velocity is perfectly OK. This means that my traveler waits at the door to a city until it opens, picks off that city and all other in zero time, until it bangs up against a city that opens at a later time, where it must again wait till opening time. The only thing that prevents him from completing his circuit is if an early city comes after a late city. A simple sort is all you need.
Lastly, even if you want to toss in a more complicated velocity model, it does little more than mildly complicate the sort comparison calculation so instead of making the comparison
boolean ICanMakeIt = city.openingTime <= city[i+1].openingTime
it becomes
boolean ICanMakeIt = city.exitTime +
Traveler[j].vel*dist(i,i+1) <= city[i+1].closingTime
I think you are mistaken in declaring this to be a difficult modeling problem

ORA-00604 & ORA-30512 CANNOT MODIFY TABLE MORE THAN ONCE IN A TRANSACTION

We have a requirement where two tables should be in sync at any given point
in time with respect to the structure of the tables.
Any change on table/column via ALTER (MODIFY, ADD, RENAME COLUMN, DROP
COLUMN) on the parent table should be replicated to the replica table.
I created a DDL_TRIGGER on the schema and the desired result is achieved but
for the following one scenario for which its failing.
The issue is, if we try to reduce the width of the column (via ALTER ..
MODIFY) it fails with the following error
ORA-00604: error occurred at recursive SQL level 1
ORA-30512: cannot modify DEVTESTF_OIM.REPLICA_ABC more than once in a
transaction
Please follow the steps to reproduce the issue (the issue is across the DB
version checked on 10.2, 11.1 and 11.2 DB version)
-- Step1 Create Parent Table
CREATE TABLE abc (col1 VARCHAR2(10))
-- Step2 Create Replica Table
CREATE TABLE replica_abc (col1 VARCHAR2(10))
-- Step3 Create DDL Trigger
CREATE OR REPLACE TRIGGER ddl_trigger
AFTER ALTER ON SCHEMA
DECLARE
operation VARCHAR2(30);
object_name VARCHAR2(30);
l_sqltext VARCHAR2(100);
i PLS_INTEGER;
l_count NUMBER:=0;
sql_text dbms_standard.ora_name_list_t;
BEGIN
i := dbms_standard.sql_txt(sql_text);
SELECT ora_sysevent, ora_dict_obj_name, UPPER(sql_text(i))
INTO operation, object_name, l_sqltext
FROM dual;
IF ora_dict_obj_name = 'ABC' THEN
l_count := INSTR(l_sqltext,'ADD CONSTRAINT',1,1);
l_count := l_count + INSTR(l_sqltext,'DISABLE',1,1);
l_count := l_count + INSTR(l_sqltext,'DROP CONSTRAINT',1,1);
l_count := l_count + INSTR(l_sqltext,'PRIMARY KEY',1,1);
l_count := l_count + INSTR(l_sqltext,'ADD CHECK',1,1);
IF (l_count = 0) THEN
l_count := INSTR(l_sqltext,'ADD',1,1);
l_count := l_count + INSTR(l_sqltext,'MODIFY',1,1);
l_count := l_count + INSTR(l_sqltext,'DROP COLUMN',1,1);
l_count := l_count + INSTR(l_sqltext,'RENAME
COLUMN',1,1);
IF (l_count >0) THEN
l_sqltext := REPLACE(l_sqltext,'TABLE ABC','TABLE REPLICA_ABC');
execute immediate l_sqltext;
END IF;
END IF;
END IF;
EXCEPTION
WHEN OTHERS THEN
RAISE ;
END;
-- Step 4 Issue the following ALTER command on the Parent table 'ABC'
ALTER TABLE ABC MODIFY COL1 VARCHAR2(9);
will show the following
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-30512: cannot modify DEVTESTF_OIM.REPLICA_ABC more than once in a
transaction
ORA-06512: at line 34
whereas the following commands works fine
ALTER TABLE ABC MODIFY COL1 VARCHAR2(11);
and also the rest of the operations
ALTER TABLE ABC ADD COL2 VARCHAR2(20);
ALTER TABLE ABC RENAME COLUMN COL2 TO COL3;
ALTER TABLE ABC DROP COLUMN COL3;
The issue is while reducing the size of VARCHAR2 columns, while the rest of
option works fine.
Any suggestion or workaround please.

It looks like a bug to me. The failing statement from the SQL trace is
PARSE ERROR #12:len=77 dep=3 uid=0 oct=3 lid=0 tim=1263332549608656 err=30512
select /*+ first_rows */ 1 from "TIM"."REPLICA_ABC" where LENGTHB("COL1") > 9and exception cannot explain it.

A simple question...Constraints covering more than 1 table

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