Select * first fetches 5th row... Why?

Dear Experts,
I developed a z-table, with fields
rno(6) type n,
name(20) type c
and then created ten entries from rno 1 to 10.
and a z-report which uses this table
select * from ztable.
first it displays 5th row and then 1 to 4 and then 6 to 10.
Can help me why it displays 5th row first?
Thanks in Adance

SAP Help
If you do not use the ORDER BY clause, the sequence of the lines in the selection is indeterminate, and can vary each time the SELECT statement is executed.
You can sort the selection by any column (not necessarily those of the primary key), and specify the columns either statically or dynamically.

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difficult to tell like this.but better you debug your code then you can get where you getting filename wrong.

Alv colour row select first row

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Hi,,
I have implemented the logic in end routine and it still reads only the first row.
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Edited by: Bhat Vaidya on Sep 10, 2010 11:27 AM
Edited by: Bhat Vaidya on Sep 10, 2010 11:37 AM

Why DDL during SELECT is possible. Or why SELECT does not put a table lock?

This is a question to people who really knows Oracle internals or/and RDB theory.
(The question is relocated from another thread for not hijacking on that's original question.)
Why DDL during SELECT is possible? Or why SELECT does not put TM 2 Row Shared lock on table(s)?
This not locking causes a possibility while one session is running a long select, another can truncate and even drop table(s) that are being read by the first session.
I think, humbly assume, that Oracle does not put TM 2 lock on tables, that are being simply SELECTed, by some significant technical reason. But I do not know this reason. If somebody knows please shed a light.
Also, if you know that this behavior is totally correct from perspective of RDB theory, please explain me.
I'll try to explain my point.
It is a matter of data consistency and integrity that is supported in Oracle everywhere except this place.
a) If one session is reading data from moment T and other session changes data on its way at moment T1, the first session wont read that changed data, it will read the data that was there on moment T.
This is declared as Read Consistency principle.
b) If one session is changing data, and another session tries to truncate or drop table - the second session will fail with error ORA-00054: resource busy and acquire with NOWAIT specified.
This is declared as Data Integrity principle.
c) But why not to follow the above principles in case when one session reads data and another session tries to truncate or drop table (or do other DDL operations)?
It is counter-intuitive. Why not to put TM 2 (SS) lock during SELECT execution that would prevent DDLs on this table?
What I only can assume is that this is only because some technical difficulty or limitation.
What is this limitation or other reason in favor of which Oracle sacrificed consistency in this case?

user11181920 wrote:
Aman,
There was no need to clarify how DML lock works, I know that.
Also I know that in Oracle a Select does not lock neither table rows nor table itself.
The reason I mentioned it because you brought up the word change which is far better suited for DML's than DDL's as the former has a requirement to have its Undo preserved.
Again, my question was why Select does not protect itself by locking table(s), partitions and indexes?Protect from what? There is nothing wrong with doing a select. What would happen with a select doing a lock on the table before being executed in its entirety (forget DDL and DML altogether for a moment) ? State one good reason that there should be a lock for the select. If it has to, it would be always isn't it?
The keyword here is concurrency and that's what is the best when the number of locks obtained are lesser at non-required operations. A select doesn't change anything that's why in Oracle, there is no read-level lock.I am not saying about row locks while reading. They are not needed because Undo resolves concurrency.Only in the case of DML where the change is still active and the buffers are dirty. With a DDL, its an implicit commit.
I am asking why Select does not enqueue one, only one lock per object that participates in the Select?Again, my question back to you is, what good you would get from it? What purpose it would solve?
It is not very expensive, I suppose. But it would protect from DDLs that can destroy the Select's result set. You have seen in your system and in my demo(and that's what the the question was on the other thread also) that the result remains intact and its not a behavior from now. Its the same since the time I have started learning Oracle. Can you explain that why you think that the result of select statement would be wrong for a drop table? I believe, its been stated repeatedly that if the select has no requirement to look back the table, it would get completed. Only if the select needs to access the table again, it would fail. So even if we consider your explanation, there is no wrong result shown at all. Once the session encounters that the table is dropped for the statement, the execution stops right away. So where is the destroyed result?
Yes, it is less dangerous when Select does not lock table comparing with what would happen with DMLs in such case (that is why DMLs protect themselves by TM 3), it affects only the Select and its consumer, but still ... I don't understand this Oracle's decision. What is a reasoning behind it?.As I said, to improve concurrency.
Aman....

JTable checkboxes doesn't retain their selection when a new row is added!!

HI,
My gui has the JTable component which has 5 columns. out of which 4 columns are checkboxes. whenever i select an item from the Jlist and click on the add button it will add a new row in JTable.
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hi parvathi,
i have made changes to my previous code and here's the code:
class FunctionTableModel extends DefaultTableModel{
       /** The instances who's attribute structure we are reporting */
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    //protected String[] func_array;
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    protected boolean [] m_Sum;
    protected boolean [] m_Min;
    protected boolean [] m_Avg;
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    //protected Vector m_Min1;
    //protected Vector m_Avg1;
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     * @param instances the initial set of Instances
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      //m_Max1 = new Vector();
      //m_SD1 = new Vector();
      //func_array = new String[];
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     * @param instances the new set of Instances.
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      //func_element = ele;
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      for(int i=0;i<vec.size();i++){
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        counter++;
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        //m_Sum1 = m_Sum;
        //m_Min1 = m_Min;
        //m_Avg1 = m_Avg;
        //m_Max1 = m_Max;
        //m_SD1 = m_SD;
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        //System.out.println("at setElement");
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        //System.out.println(counter);
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        //m_Max1 = m_Max;
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     * Gets the number of columns: 3
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     * @param column the column index
     * @return the value at row, column
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      switch (column) {
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        //Boolean m_Sum_Value = new Boolean(m_Sum[row]);
        //System.out.println("m_Sum_Value:"+m_Sum_Value.booleanValue());
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        return new Boolean(m_Min[row]);
      case 3:
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      case 4:
        return new Boolean(m_Max[row]);
      case 5:
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        func_vector.removeAllElements();
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        fireTableDataChanged();
     * Gets the name for a column.
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     * Sets the value at a cell.
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if (col == 2)
m_Min[row] = ((Boolean) value).booleanValue();
if (col == 3)
m_Avg[row] = ((Boolean) value).booleanValue();
if (col == 4)
m_Max[row] = ((Boolean) value).booleanValue();
if (col == 5)
m_SD[row] = ((Boolean) value).booleanValue();
* Gets the class of elements in a column.
* @param col the column index.
* @return the class of elements in the column.
public Class getColumnClass(int col) {
return getValueAt(0, col).getClass();
* Returns true if the column is the "selected" column.
* @param row ignored
* @param col the column index.
* @return true if col == 1.
public boolean isCellEditable(int row, int col) {
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return false;
public void removeRow(int row){
if(row<=func_vector.size()){
func_vector.removeElementAt(row);
counter--;
fireTableDataChanged();
previouslu i was using the setElement method. now i have replaced with the addRow method...
but anyways...the control is not going to any of these overridden methods...and none of the elements are added to the table. But i comment of all the addRow, getValueAt, getColumnClass methods...then it's adding rows to the table but with only the first column all the remaiing columns are just empty...
i am fed up with this...if you observe i have commented out somany lines...becoz i am trying to save my boolean array values into a vector..but that was also in vain...
i appreciate for ur help...
thanks
sri

How to create a report region which the first colomn is row selector column

I want to create a report region and its first column is a row selector column. I have used select sentence to select some columns. But I do not know how set the first column to row selector column. I mean I want to do as follow. When a radio which is first column is chosen, it will return it's value of the column in the chosen row. Please help me! Thanks

Hi unnamed,
Suppose you have an id that identifies your record.
Go to Report definiton, tab report attirbutes.
Select the id of your record.
Create a link to the page you want to go to.
Hope this helps.
If not, I suggest you to create a from with report, and analyze the way the wizard has generated it.
Leo

How do I select a range of rows from an internal table in the debugger?

Hi,
I have a case where I wanted to delete a range of rows (several thousand) from an internal table using the debugger.
It seems that rows can only be selected one at a time by selecting (clicking) on the far left side of the row.
This is cumbersome, if not impossible when wishing to delete several thousand rows.
Other tools, such as Excel for example, allow for selecting a range of rows by selecting the first row and then holding the SHIFT key and selecting the last row and all rows in between will be selected.
I can't seem to find the combination of keys that will allow this in the table (or structure) tab of the debugger.
Is it possible to select a range of rows without having to select each row one at a time?
Thanks for your help,
Andy

While it's a Table Control and should/could have a button to select all fields (or visible fields)...I don't think we can do it right now...I know it's a pain to select each row one at a time...but I don't we have any more options...
Greetings,
Blag.

How to extend the selection from cell to row when click one sepecial cell

The JTable contains a special column to display the line number for each row. When user click on the first column(contains row number), the selection would extend to the whole row(React something like Excel). How can i achieve that?
And how to achieve that for TableHeader?
Thanks a lot!
1|
#|###########################
3|
4|

Check out this posting for one way to do this:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=594338

'SELECT_LIST_FROM_LOV' giving error if LOV fetches 47 rows

Hi All,
We are using 'SELECT_LIST_FROM_LOV' function to create dynamic items in a tabular form. It works fine when LOV fetches < = 47 rows but is giving 'buffer overflow error' if it fetches more!
Any help/suggestions would be appreciated.
APEX Version : 2.2.1
Regards,
Hari

Did you try it first? I know the issue and ran into the exact same one and this is how to change it. Calling that function just returns a string to Apex and the buffer is only so big for LOV's. If you need more than 47 rows in your case, you need the _XL function.
You are correct that it returns a CLOB, but its returning that to Apex, not to your process so to speak. It will handle it correctly in its internal API's.
Try it and if it doesn't work we can figure it out but give it a shot!

How to select data from 3rd row of Excel to insert into Sql server table using ssis

Hi,
Iam having Excel files with headers in first two rows , i want two skip that two rows and select data from 3rd row to insert into Sql Server table using ssis.3rd row is having column names.

CUSTOMER DETAILS
REGION
COL1 COL2 COL3 COL4 COL5 COL6 COL7
COL8 COL9 COL10 COL11
1 XXX yyyy zzzz
2 XXX yyyy zzzzz
3 XXX yyyy zzzzz
4 XXX yyyy zzzzz
First two rows having cells merged and with headings in excel , i want two skip the first two rows and select the data from 3rd row and insert into sql server using ssis
Set range within Excel command as per below
See
http://www.joellipman.com/articles/microsoft/sql-server/ssis/646-ssis-skip-rows-in-excel-source-file.html
Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
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How to fetch indivdual rows from a dynamic query.

Hi,
I wish to fetch the individual rows returned from a dynamic query.
if my dynamic query is:
dyn_stmt := select col1, col2, col3
from tab1;
The query returns multiple rows.
Then how to fetch individual rows of this query ?
Please explain.

declare
cur_test sys_refcursor;
c1 varchar2(30);
c2 number;
c3 date;
begin
dyn_stmt := select col1, col2, col3 from tab1;
OPEN cur_test FOR dyn_stmt;
LOOP
    FETCH cur_test INTO c1, c2, c3;
    IF cur_test%NOTFOUND THEN
      EXIT;
    END IF;
    -- Process this row
END LOOP;
CLOSE cur_test;
END;

Query for selecting first 3 characters of name of any person

query for selecting first 3 characters of name of any person

10:52:44 SQL> SELECT SUBSTR(ename, 1, 3) first_three FROM emp;
FIRST_THREE
SMI
ALL
WAR
JON
MAR
BLA
CLA
SCO
KIN
TUR
ADA
FIRST_THREE
JAM
FOR
MIL
Ton
15 rows selected.
Elapsed: 00:00:00.00

Select * first fetches 5th row... Why?

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