How to make allow null for a column in all table.

Question

Hi,
I have a column "col1" in all tables (user made table) , i want to make it allow null
please tel me how can it be done using single script.
i mean in short way.
yours sincerely.

Answer 1

yes. absolutely you can.
Look, what i got -
Ranit>>  select 'alter table ' || table_name || ' modify("TIMESTAMP" null) ; ' from user_tab_columns where column_name='TIMESTAMP' and nullable ='N';
'ALTERTABLE'||TABLE_NAME||'MODIFY("TIMESTAMP"NULL);'                           
alter table FIXED_OBJ$ modify("TIMESTAMP" null) ;                              
alter table SUMPARTLOG$ modify("TIMESTAMP" null) ;                             
alter table SUMDELTA$ modify("TIMESTAMP" null) ;                               
alter table ALL_SUMDELTA modify("TIMESTAMP" null) ;                            
alter table DBA_EXP_FILES modify("TIMESTAMP" null) ;                           
alter table WRI$_DBU_CPU_USAGE modify("TIMESTAMP" null) ;                      
alter table DBA_CPU_USAGE_STATISTICS modify("TIMESTAMP" null) ;                
7 rows selected.But, it is not over.
Either - You have to do an 'EXECUTE IMMEDIATE' over these 'alter' scripts.
OR - Take these scripts, put it into a <script_name>.sql file and then execute this file.
Hope you understand.
Edited by: ranit B on Dec 22, 2012 3:17 PM
-- code added