Help with select on null values

drop table t1;
create table t1 ( c1 number,c2 varchar2(2) );
insert into t1 values(1,'A');
insert into t1 values(2,'B');
insert into t1 values(3,'');
insert into t1 values(4,'D');
drop table t2;
create table t2 ( c1 number,c2 varchar2(2) );
insert into t2 values(1,'A');
insert into t2 values(2,'B');
insert into t2 values(3,'');
insert into t2 values(4,'C');
select a.c1 from t1 a ,t2 b
where a.c2 = b.c2;
and result should be
1
2
3

does not make any difference
drop table t1;
create table t1 ( c1 number,c2 varchar2(2) );
insert into t1 values(1,'A');
insert into t1 values(2,'B');
insert into t1 values(3,null);
insert into t1 values(4,'D');
drop table t2;
create table t2 ( c1 number,c2 varchar2(2) );
insert into t2 values(1,'A');
insert into t2 values(2,'B');
insert into t2 values(3,null);
insert into t2 values(4,'C');
select a.c1 from t1 a ,t2 b
where a.c2 = b.c2;
and result should be
1
2
3

Similar Messages

Select list null value issue - for filtering the tabular form report

hello,
I have a tabular form created on emp table and in the table their are entries for the employees who don't have a location, like it is null for some of the employees.
Now I have created a select list item - for filtering the results based on location.
my select query for select list item is
select distinct location_name d,location_id r from emp order by 1
-- so my select list contains all the distinct location_name including the null on my tabular form.
so based on the selelcted value(in the select list), I am able to filter the results in my tabular form.
but the thing is that when i try to select an null value from my select list - i am not able to filter my report - like its displaying all the records, its not filtering.
can anyone help me out with this.
thanks.

Hi
Try below select for LOV
select distinct nvl(location_name,'No Location') d,nvl(location_name,'No Location') r from emp order by 1 And then change tabular from select where clause also use nvl(location_name,'No Location') like
SELECT *
FROM emp
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Need help with the session state value items.

I need help with the session state value items.
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Edited by: Bob37 on Dec 6, 2011 10:36 AM

Help with SELECT - selecting range of numbers

Hi,
I need a help with SELECT statement. I want to select Dates starting from today and ending 30 days back. So the result would be like:
TRUNC(SYSDATE)
TRUNC(SYSDATE) - 1
TRUNC(SYSDATE) - 2
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SQL> select trunc(sysdate) - level + 1 as dt
2 from dual
3 connect by level <= 31
4 ;
DT
07/01/2013
06/01/2013
05/01/2013
04/01/2013
03/01/2013
02/01/2013
01/01/2013
31/12/2012
30/12/2012
29/12/2012
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26/12/2012
25/12/2012
24/12/2012
23/12/2012
22/12/2012
21/12/2012
20/12/2012
19/12/2012
DT
18/12/2012
17/12/2012
16/12/2012
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13/12/2012
12/12/2012
11/12/2012
10/12/2012
09/12/2012
08/12/2012
31 rows selected

Need help Take out the null values from the ResultSet and Create a XML file

hi,
I wrote something which connects to Database and gets the ResultSet. From that ResultSet I am creating
a XML file. IN my program these are the main two classes Frame1 and ResultSetToXML. ResultSetToXML which
takes ResultSet & Boolean value in its constructor. I am passing the ResultSet and Boolean value
from Frame1 class. I am passing the boolean value to get the null values from the ResultSet and then add those
null values to XML File. When i run the program it works alright and adds the null and not null values to
the file. But when i pass the boolean value to take out the null values it would not take it out and adds
the null and not null values.
Please look at the code i am posing. I am showing step by step where its not adding the null values.
Any help is always appreciated.
Thanks in advance.
============================================================================
Frame1 Class
============
public class Frame1 extends JFrame{
private JPanel contentPane;
private XQuery xQuery1 = new XQuery();
private XYLayout xYLayout1 = new XYLayout();
public Document doc;
private JButton jButton2 = new JButton();
private Connection con;
private Statement stmt;
private ResultSetToXML rstx;
//Construct the frame
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
//Component initialization
private void jbInit() throws Exception {
//setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
contentPane = (JPanel) this.getContentPane();
xQuery1.setSql("");
xQuery1.setUrl("jdbc:odbc:SCANODBC");
xQuery1.setUserName("SYSDBA");
xQuery1.setPassword("masterkey");
xQuery1.setDriver("sun.jdbc.odbc.JdbcOdbcDriver");
contentPane.setLayout(xYLayout1);
this.setSize(new Dimension(400, 300));
this.setTitle("Frame Title");
xQuery1.setSql("Select * from Pinfo where pid=2 or pid=4");
jButton2.setText("Get XML from DB");
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(java.lang.ClassNotFoundException ex) {
System.err.print("ClassNotFoundException: ");
System.err.println(ex.getMessage());
try {
con = DriverManager.getConnection("jdbc:odbc:SCANODBC","SYSDBA", "masterkey");
stmt = con.createStatement();
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton2_actionPerformed(e);
contentPane.add(jButton2, new XYConstraints(126, 113, -1, -1));
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
void jButton2_actionPerformed(ActionEvent e) {
try{
OutputStream out;
XMLOutputter outputter;
Element root;
org.jdom.Document doc;
root = new Element("PINFO");
String query = "SELECT * FROM PINFO WHERE PID=2 OR PID=4";
ResultSet rs = stmt.executeQuery(query);
/*===========This is where i am passing the ResultSet and boolean=======
===========value to either add the null or not null values in the file======*/
rstx = new ResultSetToXML(rs,true);
} //end of try
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
======================================================================================
ResultSetToXML class
====================
public class ResultSetToXML {
private OutputStream out;
private Element root;
private XMLOutputter outputter;
private Document doc;
// Constructor
public ResultSetToXML(ResultSet rs, boolean checkifnull){
try{
String tagname="";
String tagvalue="";
root = new Element("pinfo");
while (rs.next()){
Element users = new Element("Record");
for(int i=1;i<=rs.getMetaData().getColumnCount(); ++i){
tagname= rs.getMetaData().getColumnName(i);
tagvalue=rs.getString(i);
System.out.println(tagname);
System.out.println(tagvalue);
/*============if the boolean value is false it adds the null and not
null value to the file =====================*/
/*============else it checks if the value is null or the length is
less than 0 and does the else clause in the if(checkifnull)===*/
if(checkifnull){
if((tagvalue == null) || tagvalue.length() < 0 ){
users.addContent((new Element(tagname).setText(tagvalue)));
else{
users.addContent((new Element(tagname).setText(tagvalue)));
else{
users.addContent((new Element(tagname).setText(tagvalue)));
root.addContent(users);
out=new FileOutputStream("c:/XMLFile.xml");
doc = new Document(root);
outputter = new XMLOutputter();
outputter.output(doc,out);
catch(IOException ioe){
System.out.println(ioe);
catch(SQLException sqle){

Can someone please help me with this problem
Thanks.

Need help with trim and null function

Hi all,
I need help with a query. I use the trim function to get the first three characters of a string. How do I write my query so if a null value occurs in combination with my trim to say 'Null' in my results?
Thanks

Hi,
Thanks for the reply. What am I doing wrong?
SELECT trim(SUBSTR(AL1.user_data_text,1,3)),NVL
(AL1.user_data_text,'XX')
FROM Table
I want the XX to appear in the same column as the
trim.The main thing you're doing wrong is not formatting your code. The solution may become obvious if you do.
What you're saying is:
SELECT trim ( SUBSTR (AL1.user_data_text, 1, 3))
,       NVL ( AL1.user_data_text, 'XX' )
FROM    Tablewhich makes it clear that you're SELECTing two columns, when you only want to have one.
If you want that column to be exactly like the first column you're currently SELECTing, except that when that column is NULL you want it to be 'XX', then you have to apply NVL to that column, like this:
SELECT NVL ( trim ( SUBSTR (AL1.user_data_text, 1, 3))
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FROM    Table

Problem with QofQ and Null Values

Just converted from CF5 to CF7. Finally figured out what was
causing the error message :
"The value "" cannot be converted to a number" when running a
QofQ. It happens whenever there is a NULL (and I think a ZERO)
value in the QofQ. I'm using the QofQ in a seperate chart program.
The main query merges data from a store and a region table.
I'm doing a LEFT OUTER JOIN to combine the REGION with the STORE,
AND so that stores with NO SALES for a given day will show up as
ZERO. On the main report, when I don't use a QofQWhen grouping by
DAY or MONTH, I can test the value in the CFOUTPUT for NULL or ZERO
and display "0" or "N/A" on the report.
But when I try to chart it, using a QofQ to read in the
values from the main query, and format the numbers, I get this
error message. I've tried using the CAST function, using FLOAT,
DOUBLE, BIGINT, etc., but still get same error message.
The only way I could fix this is to add a WHERE statement to
the QofQ, that only includes sales values greater than ZERO. But
then, I have gaps in my chart because stores with NO SALES for a
given day or MONTH don't appear. Because they are removed from the
query. The whole point of LEFT JOINS is to include items with no
values (or NULL) values.
Does anyone know if it's possible to keep these values in a
QofQ? So that items (e.g., store locations in my case) with NULL or
ZERO values for some or all days or months can be charted? Even
with a ZERO value? I've read everything I can get my hands on
regarding QofQ, the CAST function, etc., but nothing seems to work.
Thanks for any help. (FYI, didn't have this problem with CF5. It's
QofQ could handle NULL or ZERO values without providing an error).
Gary

Well, I tried the IsNull function on the 3 SUM() values I was
calculating in my SELECT statement (on a LEFT OUTER JOIN QUERY),
and I STILL got another "cannot convert "" to a number" but this
time the error message was more direct, and pointed me to a DATE
field in my query, where I was SORTING AND GROUPING either by DAY
or MONTH (depending on what user selected on form).
In my QofQ, I'm not just reformating the integer SUM()
values, but also the date values. So, I applied the IsNull()
function to the DATE values in my main query. I still kept getting
errors. But after experimenting ((SQL Server BOL docs doesn't give
ISNULL() examples for DATE FIELDS, only NUMBER fields), I tried
putting the dates in SINGLE QUOTES in my IsNull() function, the
QUERY RAN. Then I wasn't sure WHAT date to enter, e.g., 1/1/1889 or
1/1/2001, etc.
Then, I discovered, after experimenting, that you cannot just
blindly enter ANY date when using IsNull in a date field,
especially if you are using CFGRAPH to chart the results by day.
You have to select a date within the date range the user selected,
so this means using the FORM.DATE (or URL.DATE) value from the
form. Here's the working example from my SELECT main query:
SELECT SUM(ISNULL(d.ttldb,0)) AS SumOfDB,
SUM(ISNULL(d.ttldbv,0)) AS SumOfDBV,
SUM(ISNULL(d.ttldbi,0)) AS SumOfDBI,
<CFIF '#url.reptype#' IS "DAILY">
ISNULL(d.depday, '#url.date1#') AS depday
<CFELSE>
month(ISNULL(d.depday, '#url.date2#')) AS TranMonth,
year(ISNULL(d.depday, '#url.date2#')) AS TranYear
</CFIF>
Then I discovered that whatever date was used in the URL.DATE
field (in my case it would be one of the two date field from the
form, and depended on whether you coded DATE1 or DATE2, the chart
would always show ZERO values for that date. So I tried putting the
IsNull() date values in the GROUP BY and ORDER BY statements, e.g.,
<CFIF '#url.reptype#' IS "DAILY">
GROUP BY ISNULL(d.depday, '#url.date1#')
ORDER BY ISNULL(d.depday, '#url.date1#') DESC
<CFELSE>
GROUP BY year(ISNULL(d.depday, '#url.date2#')),
month(ISNULL(d.depday, '#url.date2#'))
ORDER BY year(ISNULL(d.depday, '#url.date2#')),
month(ISNULL(d.depday, '#url.date2#'))
</CFIF>
And this worked. The report ran just fine, and the chart
charted every value correctly.
I guess you have to learn all the little "quirks" about CF7
and how it's QofQ and chart programs work. But so far, so good.
Thank you all for your help. Now I've got to update other old
CF5 programs that are returning errors when there are null values
from my LEFT OUTER JOIN queries. Will take some time, but at least
I know how to do it. Thanks to your help.
I really appreciate your time and efforts to help with this
issue.
Gary

HELP NEEDED !! Null values in Database

Hi there !!
I need help with EJB 3.0 passing null values to database. The situation looks like that :
I have created EJB entity class called "Osoba.java", it is in relation
with "Rola.java" (one to many). Each Object of class Osoba can have
many Roles. Then I created "OsobaServiceBean.java " I included it with
metod "CreateUnregisteredOsoba(Osoba , Boolean)". From "flex" level I
call this bean - call is accepted, and as a result new object of class Osoba is added to database. Problem is that only one column is filled in table,
dispite that in service bean I enforce it to fill all columns (see
source code - file OsobaServiceBean.java , method
createUnregisteredOsoba() )
I provided source code here :
FILE Rola.java
package test.granite.ejb3.entity ;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
@Entity
public class Rola extends AbstractEntity {
private static final long serialVersionUID = 1L;
@Basic
private String login = new String("");
@Basic
private String rola = new String("");
@Basic
private String roleGroup = new String("");
@Basic
private Boolean zatwierdzony = new Boolean(false);
@ManyToOne(optional=false)
private Osoba osoba;
public Boolean getZatwierdzony() {
return zatwierdzony;
public void setZatwierdzony(Boolean zatwierdzony) {
this.zatwierdzony = zatwierdzony;
public String getLogin() {
return login;
public void setLogin(String login) {
this.login = login;
public String getRola() {
return rola;
public void setRola(String rola) {
this.rola = rola;
public Osoba getOsoba() {
return osoba;
public void setOsoba(Osoba osoba) {
this.osoba = osoba;
public String getRoleGroup() {
return roleGroup;
public void setRoleGroup(String roleGroup) {
this.roleGroup = roleGroup;
FILE Osoba.java
package test.granite.ejb3.entity ;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.OneToMany;
@Entity
public class Osoba extends AbstractEntity {
private static final long serialVersionUID = 1L;
@Basic
private String imie;
@Basic
private String nazwisko;
@Basic
private String login;
@Basic
private String haslo;
@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER,
mappedBy="osoba")
private Set<Rola> role = new HashSet<Rola>();
@Basic
private String email;
@Basic
private String nrTelefonu;
@Basic
private int rokStudiow;
public String getPelneImie() {
StringBuilder sb = new StringBuilder();
if (imie != null && imie.length() > 0)
sb.append(imie);
if (nazwisko != null && nazwisko.length() > 0) {
if (sb.length() > 0)
sb.append(' ');
sb.append(nazwisko);
return sb.toString();
public String getImie() {
return imie;
public void setImie(String imie) {
this.imie = imie;
public String getNazwisko() {
return nazwisko;
public void setNazwisko(String nazwisko) {
this.nazwisko = nazwisko;
public String getLogin() {
return login;
public void setLogin(String login) {
this.login = login;
public String getHaslo() {
return haslo;
public void setHaslo(String haslo) {
this.haslo = haslo;
public Set<Rola> getRole() {
return role;
public void setRole(Set<Rola> role) {
this.role = role;
public String getEmail() {
return email;
public void setEmail(String email) {
this.email = email;
public String getNrTelefonu() {
return nrTelefonu;
public void setNrTelefonu(String nrTelefonu) {
this.nrTelefonu = nrTelefonu;
public int getRokStudiow() {
return rokStudiow;
public void setRokStudiow(int rokStudiow) {
this.rokStudiow = rokStudiow;
FILE OsobaServiceBean.java
package test.granite.ejb3.service;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.annotation.security.RolesAllowed;
import javax.ejb.Local;
import javax.ejb.Stateless;
import javax.persistence.Query;
import org.jboss.annotation.security.SecurityDomain ;
import test.granite.ejb3.entity.Osoba;
import test.granite.ejb3.entity.Rola;
@Stateless
@Local(OsobaService.class)
@SecurityDomain("other")
public class OsobaServiceBean extends AbstractEntityService implements
OsobaService{
private static final long serialVersionUID = 1L;
public OsobaServiceBean() {
super();
public List<Osoba> findAllOsoba() {
return findAll(Osoba.class);
@SuppressWarnings("unchecked")
public List<Osoba> findAllOsoba(String name) {
Query query = manager.createQuery (
"select distinct p from Osoba p " +
"where upper(p.imie) like upper('%" + name + "%')
or upper(p.nazwisko) like upper('%" + name + "%')"
return query.getResultList();
public Osoba createOsoba(Osoba person) { // pozwalamy
tworzyc zeby niezalogowany
return manager.merge (person); //
uzytkownik utworzyl osobe
} // ale
osoba ta i tak nie bedzie jeszcze
// zatwierdzona
@RolesAllowed({"unregistered"})
public Osoba createUnregisteredOsoba(Osoba person, boolean
zatwierdzony) {
Rola niezarejestrowany = new Rola();
niezarejestrowany.setRola("user");
niezarejestrowany.setOsoba(person);
niezarejestrowany.setRoleGroup("Roles");
niezarejestrowany.setLogin(person.getLogin());
niezarejestrowany.setZatwierdzony(zatwierdzony);
Set<Rola> role = new HashSet<Rola>();
role.add(niezarejestrowany);
// Arrays;
Object a[] = role.toArray();
Rola temp;
temp = (Rola)a[0];
System.out.println("Login = " + temp.getLogin() + //
added only for check !!
"Rola = " + temp.getLogin() +
"Zatwierdzony = " +
temp.getZatwierdzony() +
"Rolegroup = " + temp.getRoleGroup());
person.setRole (role);
return manager.merge(person); //
uzytkownik utworzyl osobe
} // ale
osoba ta i tak nie bedzie jeszcze
public Osoba modifyOsoba(Osoba person) {
return manager.merge(person);
@RolesAllowed({"admin"})
public void deleteOsoba(Osoba person) {
person = manager.find(Osoba.class, person.getId());
manager.remove(person);
public void deleteRola(Rola rola) {
rola = manager.find(Rola.class, rola.getId());
rola.getOsoba().getRole().remove(rola);
manager.remove(rola);
DATABASE LISTING :
-----------------------------------------------------------------+----------\
--------------------------------------------------------+
| id | ENTITY_UID | version | rola |
zatwierdzony | osoba_id | login | RoleGroup |
-----------------------------------------------------------------+----------\
--------------------------------------------------------+
| 1 | | NULL | unregistered |
| 0 | unregistered | Roles | NULL |
| 33 | eee91bd9-8c5f-4154-8260-3cac9a18eb97 | 0 | user |
| 34 | NULL | NULL |
| 32 | a7ed4e8d-a1ba-473a-921c-73c8f8f89efb | 0 | user |
| 33 | NULL | NULL |
-----------------------------------------------------------------+----------\
--------------------------------------------------------+
The row numer 1 is added by hand and it works. row number 33 and 32
are added to database by method CreateUnregisteredOsoba. As you can
see fields login as well as Roles and RoleGroup are empty (NULL). What
Im doing wrong ?
Thanks for your help -
Roman Kliś
PS. Table Osoba works fine - everything is added as I want.

I solved problem.
The reason why EJB had not added anything to database NULL was becouse wrong names of class. Ive refactored whole class Rola.java to RolaClass.java and suddenly it worked.
True reason is still unknown but most importent is that it works.
Thanx for reading topic - hope next time someone will answer my questions.
By !!

Selection of Null Value in Transformation file

Hi Guru's,
I've been trying to select NULL values of a field in transformation file but unfortunately system always gets both null and filled values of the field ALTHOUGH i had maintained the Selection Option.
Data management package is: Load Transaction Data from BW InfoProvider UI
The technical name of field: 0FLAG
I've tried each possibilities as in below
SELECTION: 0FLAG, *STR()
SELECTION: 0FLAG, *STR();
SELECTION: 0FLAG, ""
SELECTION: 0FLAG, " "
SELECTION: 0FLAG, NULL
SELECTION: 0FLAG, *STR(#)
SELECTION: 0FLAG, #
SELECTION: 0FLAG, "#"
Doesn't work.
thanks in adv. for your precious supports

Hi Sadi,
I understand your question that, you want to load tr. data from infocube and you have a trouble with one field which name is "0flag" in this cube, right? If your case is above, you need conversion file for flag, and convert like that # = "DUMMY" or sth.
Or, you can solve in BW with transformation file routine.
I hope, it will help you.
Thanks.

Help with Select Option

Hi
I have this select option in the user screen
SELECT-OPTIONS: ID FOR PA0094-FPNCD. " Emp Id
But when the user tries to look up the code by clicking on to the square box beside the input box it gives the user all the entries from the Field FPNCD.
My question is there anyway i could limit it to only show certain codes when they click on the box. (In this case codes for USA only).
Thanks in advance...

Hi anwarul,
May be in this way.
First pop up the internal table by selecting the required data...
in your case you want the data of only USA.
Make select query according to ur requirement..
and then use the FM F4IF_INT_TABLE_VALUE_REQUEST
Go through the below example.
tables kna1.
data:
begin of t_values occurs 2,
value like kna1-begru,
end of t_values,
t_return like ddshretval occurs 0 with header line.
select-options s_begru for kna1-begru.
at selection-screen on value-request for s_begru-low.
clear t_values.
t_values = 'PAR*'.
append t_values.
t_values = 'UGG'.
append t_values.
call function 'F4IF_INT_TABLE_VALUE_REQUEST'
exporting
retfield = 's_begru'
value_org = 'S'
tables
value_tab = t_values
return_tab = t_return
exceptions
parameter_error = 1
no_values_found = 2
others = 3.
if sy-subrc = 0.
read table t_return index 1.
s_begru-low = t_return-FIELDVAL.
Hope it will be helpful to you.
Reward Points if it is helpful.
Thanks & Regards
ilesh 24x7

Help with Select Lists in Classic Report

Hello,
I working with APEX 4.1. Oracle 11.
I have a simple classic report with 4 columns (Username, Role, Read, Update). The Read and Update columns are Select Lists with values of "Yes", "No".
Report looks like this:
Username Role Read Update
JSmith Admin Yes Yes
LJones Dev Yes No
My requirement, is that when a user selects Yes from the Update select list, the value of the associated Read column needs to change to Yes as well for that particular Username. The change has to occur upon selection of Yes from the Update select list.
Im not very strong with javascript, but for testing purposes I applied: onchange="alert('hi');" on the Update column. When I make a change to the Update select list, the alert does pop up.
Can anyone suggest how I can implement the change to the associated Read value of Yes if the Update value chosen is Yes, for that particular row.
Thank you,
Laura

LauraK wrote:
I working with APEX 4.1. Oracle 11.
I have a simple classic report with 4 columns (Username, Role, Read, Update). The Read and Update columns are Select Lists with values of "Yes", "No".
Report looks like this:
Username Role Read Update
JSmith Admin Yes Yes
LJones Dev Yes No
My requirement, is that when a user selects Yes from the Update select list, the value of the associated Read column needs to change to Yes as well for that particular Username. The change has to occur upon selection of Yes from the Update select list.
Im not very strong with javascript, but for testing purposes I applied: onchange="alert('hi');" on the Update column. When I make a change to the Update select list, the alert does pop up.
Can anyone suggest how I can implement the change to the associated Read value of Yes if the Update value chosen is Yes, for that particular row.Should be possible to do this using a Dynamic Action without writing any (or much) JavaScript. The complexity in this case is that you're using items in a report rather than standard page items.

Need help with select that month range with flexible first date

Hello everyone,
I am trying to create a selection of month range (will be in a WITH clause) for a report to display monthly data. But the first month start date can be any date. (Not necessarily the first date of the month)
Examples:
Report input parameters:
Start Date: 08/10/12
End Month: Dec 2012
I was trying to build a with select that will list
Month_Start, Month_End
08/10/12, 31/10/12
01/11/12, 30/11/12
01/12/12, 31/12/12
OR
Month_Start, Next_Month
08/10/12, 01/11/12
01/11/12, 01/12/12
01/12/12, 01/01/13
End month is optional, so if no value the select will list only
08/10/12, 01/11/12
Oracle Database Details is
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
My code so far is
VARIABLE P50_START_DATE VARCHAR2 (10)
VARIABLE P50_END_MONTH VARCHAR2 (10)
EXEC :P50_START_DATE := '10/10/2012';
EXEC :P50_END_MONTH := '31/12/2012';
SELECT to_char(:P50_START_DATE) AS start_date
 , ADD_MONTHS( TRUNC(to_date(:P50_START_DATE,'DD/MM/YYYY'),'MONTH'), 1) AS next_month
FROM dual
union
 SELECT to_char(ADD_MONTHS( TRUNC(to_date(:P50_START_DATE,'DD/MM/YYYY'),'MONTH'), ROWNUM-1)) AS start_date
 , ADD_MONTHS( TRUNC(to_date(:P50_START_DATE,'DD/MM/YYYY'),'MONTH'), ROWNUM) AS next_month
 --, rownum
 from all_objects
 where
 rownum <= months_between(to_date(NVL(:P50_END_MONTH, :P50_START_DATE),'DD/MM/YYYY'), add_months(to_date(:P50_START_DATE,'DD/MM/YYYY'), -1))
 and rownum > 1If I put comment – on line and rownum > 1, as
-- and rownum > 1The result I get is
START_DATE NEXT_MONTH
01/10/12 01/10/12
01/11/12 01/11/12
01/12/12 01/01/13
10/10/2012 01/11/12 But when I try to remove the duplicate period (of the first month) out by restrict rownum, it do not return any rows for the second select at all. The result I get is:
START_DATE NEXT_MONTH
10/10/2012 01/11/12 Can anyone advise what wrong with the select statement ?
Thanks a lot in advance,
Ann

Hi,
Here's one way:
WITH params AS
 SELECT TO_DATE (:p50_start_date, 'DD/MM/YYYY') AS start_date
 , TO_DATE (:p50_end_month, 'DD/MM/YYYY') AS end_date
 FROM dual
SELECT GREATEST ( start_date
 , ADD_MONTHS ( TRUNC (start_date, 'MONTH')
 , LEVEL - 1
 ) AS month_start
, LEAST ( end_date
 , ADD_MONTHS ( TRUNC (start_date, 'MONTH')
 , LEVEL
 ) - 1
 ) AS month_end
FROM params
CONNECT BY LEVEL <= 1 + MONTHS_BETWEEN ( end_date
 , TRUNC (start_date, 'MONTH')
;:p50_end_month doesn't have to be the last day of the month; any day will work.
If you want to generate a Counter Table containing the integers 1 througn x in SQL, you could say
SELECT ROWNUM AS n
FROM all_objects
WHERE ROWNUM <= x
;but, starting in Oracle 9.1, it's much faster to say
SELECT LEVEL AS n
FROM dual -- or any table containing exactly 1 row
CONNECT BY LEVEL <= x
;Also, x can be greater than the number of rows in all_objects.

Help with selecting chuncks of data from a table

Hi all,
I need help with a query that should do the following.
I have a table with vessel messages, and I need to get the last "NumMsgs" messages from a group of vessels.
The problem I have is that if I order the table by Vessel_ID, MessageDate DESC, I can´t do ROWNUM < NumMsgs (<-- Then number of messages to be shown is a user parameter)
I know it should be something like:
select * from (
select *
from Messages m
where TRIM(m.V_ID) = '11597' /* I was trying for a single vessel atm */
order by m.V_ID, m.MESSAGEDATE desc
where rownum < :NumMsgs
Any ideas?
Thanks in advance !

Hi,
What about :
select *
from (
select m.*, row_number() (order by m.V_ID, m.MESSAGEDATE desc) rn
from Messages m
where TRIM(m.V_ID) = '11597' /* I was trying for a single vessel atm */
where rn < :NumMsgsAnyway, I don't very well understand your problem, your query work fine, see for example :
SQL> ed
Wrote file afiedt.buf
1 select object_name, object_id
2 from
3 (select object_name, object_id, row_number() over (order by object_id desc) as rn
4 from dba_objects)
5* where rn < 4
SQL> /
PS_TL_MTCHD_118 71763
PS_TL_MTCHD_117 71762
PS_TL_MTCHD_116 71761
SQL> ed
Wrote file afiedt.buf
1 select object_name, object_id
2 from
3 (select object_name, object_id
4 from dba_objects
5 order by object_id desc)
6* where rownum < 4
SQL> /
PS_TL_MTCHD_118 71763
PS_TL_MTCHD_117 71762
PS_TL_MTCHD_116 71761
SQL> Nicolas.
Message was edited by:
N. Gasparotto

Select list -null value?

When you create a select list on a column, and run the page for the first time, the drop down doesn't show any value. I realized that once you click on the drop down to see what the values are, at the bottom of the list there is a blank value. But you can only see this the first time you load the page. Once you click on any other value, that blank value is gone. How does this work? How can I select the blank value even after you had selected other values previously?
Thanks,

Modify the Item Definition's List of Values options (Edit Page Item->LOV)
Display Null: Yes
Null Display Value:

I am a rookie and need help with max and min values

Hello all, i am into this intro to java class. my assignment is to write a program that prompts the user for two integers and then prints the sum, difference, average, product , distance (absolute value of the difference) Maximum(largest of the two) and Minimum(smallest fo the two) here is my code so far
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.Math;
public class Sample4
 public static void main(String[] args) throws IOException
 try // attempt the following
{ // create the stream to read from
InputStreamReader istream = new InputStreamReader(System.in); // create a buffer to hold the stream
BufferedReader console = new BufferedReader(istream); // prompt the user
 System.out.println("Enter a number please"); // get input as a string
 String input = console.readLine(); // convert to an integer
 int num1 = Integer.parseInt(input);
 System.out.println("Enter a number please"); // get input as a string
 String input2 = console.readLine(); // convert to an integer
 int num2 = Integer.parseInt(input2);
 int sum = num1 + num2; // get the sum of the two inputs
 int difference = num1 - num2; // get the difference of the two inputs
 int product = num1 * num2; // get the product of the two inputs
 int average = sum / 2; // get the average of the two inputs
 int abs = Math.abs(difference); // get the absolute value of the two inputs
 // new section
 // display the number
 System.out.println("The total sum = " + sum);
 System.out.println("The total difference = " + difference);
 System.out.println("The total product = " + product);
 System.out.println("The total average = " + average);
 System.out.println("The total absolute value = " + abs);
} // if something breaks, catch the exception
catch (IOException e)
 System.out.println(e); // displays the exception
 System.exit(1); // quits the program
}what will be the right syntax or code to find the MAX and MIN values of two numbers a User Inputs, hope someone can help with this. thank you for your help.

Thanks alot man, sheesh i do not know why my book
doesnt give me all the static methods. but i do really
appreciate your help. peaceA complete list of the java.lang.Math methods can be found at http://java.sun.com/j2se/1.4/docs/api/java/lang/Math.html
btw,
max(a, b) == (a > b) ? a : b
min(a, b) == (a < b) ? a : b

Help with select on null values

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