Remove all columns in a table

whenever a user decides to choose another file to read, i would remove all the columns in the table and then write it all over again, However, I do not see such function in jtable, so how do I go about doing that?

Use the following code for remove all the row in a table...
call the DeviceClearTable()
method in mouse event...
public void DeviceClearTable()
     int numrows = DeviceModel.getRowCount();
          for(int i = numrows - 1; i >=0; i--)
               DeviceModel.removeRow(i);
Edited by: kumaravel on Jun 2, 2008 10:36 AM

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how to remove all columns and cells in numbers

Click on the Table's icon in the Sheets list. Press delete.
Done.
Regards,
Barry

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Not sure about your requirement..
This?
select table_name,sum(data_length) sm
from user_tab_cols
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Hi,
I am creating a table with two columns.
I have modified a column as unused using ALTER statement.
After that i have tried to drop the another column by using ALTER statement.
But it throws an error ORA-12983: cannot drop all columns in a table.
is it not possible to achieve this via ALTER statement?
thanks

is there any other way to find the name of the columns which have been marked as unused?Don't think so, and you would not be able to do much about. You won't be able to reference it, you won't be able to un-unuse it, and you would even be able to add a new column having same name.
Why are you using SET UNUSED in the first place?
Regards
Peter
Quoting myself:
You won't be able to reference itMaybe not good enough:
SQL> select column_name, data_type, segment_column_id
from user_tab_cols
where table_name = 'T';
COLUMN_NAME                    DATA_TYPE   SEGMENT_COLUMN_ID
SYS_C00001_11051618:28:14$     NUMBER                      1
B                              NUMBER                      2
SYS_C00003_11051618:28:14$     NUMBER                      3
3 rows selected.
select "SYS_C00003_11051618:28:14$" from t
Error at line 1
ORA-00904: "SYS_C00003_11051618:28:14$": invalid identifier
SQL> alter table t drop column "SYS_C00001_11051618:28:14$";
Table altered.
SQL> select column_name, data_type, segment_column_id
from user_tab_cols
where table_name = 'T';
COLUMN_NAME                    DATA_TYPE   SEGMENT_COLUMN_ID
B                              NUMBER
1 row selected.
Note: Both columns "disappeared" Thanks MichaelS
Edited by: Peter on May 16, 2011 9:29 AM

How to change/remove Details column in a table?

Hi,
I need to build an interface where the user would be able to review summary information on some records and edit them one in detail mode.
This all works very nice through detailDisclosure but it also automatically includes a Details column which I do not seem to be able to manipulate in any way.
Ideally I would like to replace the Details column with one called Action and positioned as last column in the table and replace the "Show" and "Hide" links with "Edit" and "Cancel" buttons... I am able to add the column with the buttons and they work just as expected as long as the table is defined with its <detail>...</detail> section in the .uix file, however that also triggers the addition of Details column, which is not desirable.
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This has been much discussed earlier. Do search posts.
For your scenario i would do the following.
inside your node which is binded to the table, i create a new node image with cardinality 1 ..1 and a attribute called path of type string.
create a supply function for the node image .
Supply method now has a Element (Parent element ) and node.
Based on your record in element, set the right image source to path attribute and bind the node.
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How to remove a column from alv table

Hi All
How to remove a specific column from alv table.?
Thanks & Regards
SUN

For delete u can follow the above post..
Fo making invisible :
data m_col type ref to cl_salv_wd_column.
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Most times, you can navigate to the indexes but the column no longer shows in the index which contained (and all other columns in the index appear to be removed as well). At least you can remove the index and then accept the change. However, some times (couldn't reproduce consistently), the index didn't display properly (no name displayed) and I couldn't leave the record without entering a dummy name before removing it.
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theFurryOne

Logging ALL Columns in a Table

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Use the following code for remove all the row in a table...
call the DeviceClearTable()
method in mouse event...
public void DeviceClearTable()
     int numrows = DeviceModel.getRowCount();
          for(int i = numrows - 1; i >=0; i--)
               DeviceModel.removeRow(i);
Edited by: kumaravel on Jun 2, 2008 10:36 AM

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Oracle 11.1.0.7:
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Table A
id
name
Table B
id
name
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user628400 wrote:
If 2 columns have null values does it match that too? I'll run some tests.It does
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Wrote file afiedt.buf
1 with a as (select 1 col1, null col2 from dual
2             union all
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4             union all
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Use the DS Workbench.

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Edited by: cubmar on May 25, 2009 2:41 PM

Hi,
No need to write PL/SQL(?). Just generate the select lists needed, by using the dictionary.
select column_name || ','
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order by column_id;Regards
Peter

Search all columns in a table

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I need a script which will fetch the column name or at least table names which will match with either some string or number? I found few examples on net to find out numbers. But I am struggling to make it work for string.
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amit

Are you looking for this?
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Elapsed: 00:00:00.17
satyaki>
satyaki>
satyaki>SELECT user_tab_columns.table_name,user_tab_columns.column_name,
2           user_tab_columns.data_type
3 FROM user_tab_columns
4 WHERE column_name = upper('&col_nm')
5 order by user_tab_columns.table_name;
Enter value for col_nm: empno
old   4: WHERE column_name = upper('&col_nm')
new   4: WHERE column_name = upper('empno')
TABLE_NAME                     COLUMN_NAME                    DATA_TYPE
AUD_EMP                        EMPNO                          NUMBER
BIN$KMfZlm2JTAGMa8qHy2RMtw==$0 EMPNO                          NUMBER
BIN$M70sSYS8RxSuSHC91rMJ7w==$0 EMPNO                          NUMBER
BIN$TQFKVismS0eN82vmFZgOKQ==$0 EMPNO                          NUMBER
BIN$WKXsDR9KSGWgL9rc4o2tMQ==$0 EMPNO                          NUMBER
BIN$Wr/F6e6QRhORNu4ZQJmYpQ==$0 EMPNO                          NUMBER
CONDITIONAL_AUDIT              EMPNO                          NUMBER
CONS_CHK                       EMPNO                          NUMBER
DEEP                           EMPNO                          NUMBER
DUP_EMP                        EMPNO                          NUMBER
DYN_EMP                        EMPNO                          NUMBER
TABLE_NAME                     COLUMN_NAME                    DATA_TYPE
EMP                            EMPNO                          NUMBER
EMP2                           EMPNO                          NUMBER
EMP_DML                        EMPNO                          NUMBER
EMP_JOB_DET                    EMPNO                          NUMBER
EMP_N                          EMPNO                          NUMBER
EMP_NO_DML                     EMPNO                          NUMBER
EMP_STAT                       EMPNO                          NUMBER
E_EMP                          EMPNO                          NUMBER
E_EMP_N                        EMPNO                          NUMBER
FF_EMP                         EMPNO                          NUMBER
MIKE_TEST                      EMPNO                          NUMBER
TABLE_NAME                     COLUMN_NAME                    DATA_TYPE
MIKE_V_TEST                    EMPNO                          NUMBER
NICK_DEMO                      EMPNO                          NUMBER
PP_GERD                        EMPNO                          NUMBER
P_EMP                          EMPNO                          NUMBER
SR_EMP                         EMPNO                          NUMBER
SS_EMP                         EMPNO                          NUMBER
TABLE_1                        EMPNO                          NUMBER
TABLE_2                        EMPNO                          NUMBER
TABLE_3                        EMPNO                          NUMBER
TABLE_MAIN                     EMPNO                          NUMBER
TEST_SSSSS                     EMPNO                          NUMBER
TABLE_NAME                     COLUMN_NAME                    DATA_TYPE
T_EMP                          EMPNO                          NUMBER
test_guido                     EMPNO                          NUMBER
35 rows selected.
Elapsed: 00:00:01.68Regards.
Satyaki De.

Remove all columns in a table

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