Set unused column

Sir
i am new to database.I am doing an oracle course on 051.My oracle faculty is saying
Set unused column option will hide the column for-ever.user can't retrieve it again.
what i believe if a statement is hiding a column there must be some option to regain it.
Is there any option of to make an unused column to reusable again?

Hi,
i am new to database.
Is there any option of to make an unused column to reusable again?Since you're new:
Try to find your answers in the Oracle documentation as well, as it explains clearly how 'Oracle things' work, with examples and you can do quick searches on keywords of your interest.
Example: http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/tables.htm#sthref2329
You should bookmark: http://tahiti.oracle.com and start reading the concepts and fundamentals when you've got some spare time.
assuming you're on 10g

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Dropping Unused column

Hi All,
I am working on version 11.2.0.3.0 ( windows server 2008 ).
While dropping unused column i am getting below error
SQL> create table er (ab varchar2(50), aa varchar2(50)) compress;
SQL> alter table er set unused column ab;
Table altered.
SQL>
SQL>
SQL>
SQL>
SQL> alter table er drop unused columns;
alter table er drop unused columns
ERROR at line 1:
ORA-39726: unsupported add/drop column operation on compressed tables

i can't do such things for these number of tablesThat is the funniest thing I've heard in a while. If you can "alter table xxx drop unused columns," why can't you do what is suggested.
And no, it's not a bug.
And no, there is not "another way around"

Drop unused column in compressed table

Good day for all.
I have partitioned compressed table under 10.2.0.4 database. I need to remove column, and did it according metalink note 429898.1, but then i execute command alter table .... drop unused columns, i got error ORA-39726 (unsupported add/drop column operation for compreseed table), so it mean that proposed workaround don't works now.
Does anyone have new workaround for this problem?

alter table MY_TABLE set unused(MY_FNG_COLUMN);
-- success
alter table MY_TABLE drop unused columns;
-- error

Unused columns in 8i

Hi,
I've set one column unused in one table. Now I want to reuse it. How to do that?
Please answer it.
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Hi
Renaming a column is not supported in 8i.
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How to recover the unused column

According to the spec, 'set unused' does not actually remove the target columns and the column data remains in the table's rows. but if a column was marked as unused, there are no any access to the column. then why the clause is released?is it better than drop column?if the unused columns exist still,why there are no clause to restore it?

http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:2913496610745#2914947431112

Set Unused

I am using oracle 9i and have following problem.
I have made one of the columns in a table unused using
ALTER TABLE TABLE_NAME SET UNUSED COLUMN_NAME;
Now I want to undo this effect means to say i want to see this column again in output how is it possible ...?

SET UNUSED Clause:
Until you actually drop these columns, they continue to count toward the absolute limit of 1000 columns in a single table. However, as with all DDL statements, you cannot roll back the results of this clause. That is, you cannot issue SET USED counterpart to retrieve a column that you have SET UNUSED. Please refer to CREATE TABLE for more information on the 1000-column limit.
«

DROP UNUSED COLUMN

Dear Gurus
I have a situation where I need to drop specific columns which are set to unused!
Say, I have 3 unused columns in a table and now I want to drop only one unused column from that.
SQL> alter table scott.emptest set unused (ENAME);
Table altered.
SQL> alter table scott.emptest set unused (COMM);
Table altered.
Once I set some columns un-used, now I want to drop only one un-used Column ENAME
SQL> alter table scott.emptest drop column ENAME;
alter table scott.emptest drop column ENAME
ERROR at line 1:
ORA-00904: "ENAME": invalid identifier
which in turn throws this error!
Help appreciated!
Thanks in advanced
Ravi Prakash

SCOTT@demo102> create table tbl_25 as select * from emp
SCOTT@demo102> /
Table created.
SCOTT@demo102> desc tbl_25
Name                                      Null?    Type
EMPNO                                              NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)
SCOTT@demo102> alter table tbl_25 set unused (deptno)
SCOTT@demo102> /
Table altered.
SCOTT@demo102> alter table tbl_25 set unused (comm);
Table altered.
SCOTT@demo102> desc tbl_25
Name                                      Null?    Type
EMPNO                                              NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
SCOTT@demo102> select * from all_unused_col_tabs where table_name ='TBL_25';
OWNER                          TABLE_NAME                          COUNT
SCOTT                          TBL_25                                  2
SCOTT@demo102> alter table tbl_25 drop unused column;
Table altered.
SCOTT@demo102> select * from all_unused_col_tabs where table_name ='TBL_25';
no rows selected
SCOTT@demo102> Nicolas.
Add queries on all_unused_col_tabs.
Message was edited by:
N. Gasparotto

Set a column to be nullable

Hi, I am not really good at SQL. Please help me if you can.
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2 (foo number default 1 not null, doo varchar(10));
Table created.
SQL> insert into testit (foo, doo) values (15, 'a');
1 row created.
SQL> insert into testit (foo, doo) values (14, 'b');
1 row created.
SQL> insert into testit (doo) values ('c');
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       FOO DOO
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        14 b
         1 c
SQL> describe testit;
Name                                      Null?    Type
FOO                                       NOT NULL NUMBER
DOO                                                VARCHAR2(10)
SQL> ALTER TABLE testit
2 modify foo DEFAULT NULL;
Table altered.
SQL> describe testit;
Name                                      Null?    Type
FOO                                       NOT NULL NUMBER
DOO                                                VARCHAR2(10)
SQL> insert into testit (doo) values ('ddd');
insert into testit (doo) values ('ddd')
ERROR at line 1:
ORA-01400: cannot insert NULL into ("TESTIT"."FOO")
SQL> select constraint_name from all_cons_columns
2   where table_name = 'TESTIT';
CONSTRAINT_NAME
SYS_C00289436
SQL> select search_condition from all_constraints
2   where constraint_name = 'SYS_C00289436';
SEARCH_CONDITION
"FOO" IS NOT NULL
SQL> alter table testit drop constraint SYS_C00289436;
Table altered.
SQL> insert into testit (doo) values ('ddd');
1 row created.
SQL> commit;
Commit complete.
SQL>

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How to set the column order of a sealed column in a custom Content Type for the new item form NewDocSet.aspx?

Dear SharePoint Developers,
Please help.
I need to know How to set the column order of a sealed column in a custom Content Type for the new item form NewDocSet.aspx?
I think this is a "sealed column", whatever that is, which is shown in SPD 2013 as a column of content type "document, folder, MyCustomContentType".
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-- Mark Kamoski

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Set unused column

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