Getting error while executing this select statement

Question

Hi All,
I am new to this community.
I am getting error whie compiling the below code. Its telling 'Text' is invalid identifier. Also i want to know how can we obtain 'parseable' version of the below query?
my basic intention is to create a trigger header through a select statement and show it the complete text as a single column..
select text from
(select 'CREATE OR REPLACE TRIGGER '||SUBSTR(column_name,2,4)||'aud
AFTER INSERT
OR UPDATE
OF '||column_name||',
OR DELETE ON '||table_name||'
FOR EACH ROW'
FROM(SELECT lower(REPLACE(column_name,'O_','')) column_name , /*changing O to O_*/
lower(replace(t.table_name,'_A_','_')) table_name,
lower(t.table_name) table_name1,
c.column_id
FROM all_tab_columns c,
(SELECT object_name table_name
FROM all_objects
WHERE object_name LIKE '%/_A/_%' ESCAPE '/') t
WHERE c.table_name(+) = t.table_name
AND SUBSTR(column_name(+),1,2) = 'O_'))

Answer 1

thanks prathamesh. it solved the problem. i have one more question.
as of now it creates single create trigger statement for each column on a table.
example:
CREATE OR REPLACE TRIGGER ust_aud
AFTER INSERT
OR UPDATE
OF cust_id,
OR DELETE ON characteristic_t
FOR EACH ROW
however, i want to create trigger for all columns in a single statement. can you please help me how to do it?
basically want to 'CREATE TRIGGER' for all columns in a table. i am finding difficult how to change my query to suit this!!
i am pasting my original query again for your reference. pls advise...
example:
CREATE OR REPLACE TRIGGER ust_aud
AFTER INSERT
OR UPDATE
OF cust_id,
fixed_item_val,
copy_item_val,
rgn_id,
txn_id,
OR DELETE ON characteristic_t
FOR EACH ROW
ORIGINAL QUERY
select text from
(select 'CREATE OR REPLACE TRIGGER '||SUBSTR(column_name,2,4)||'aud
AFTER INSERT
OR UPDATE
OF '||column_name||',
OR DELETE ON '||table_name||'
FOR EACH ROW' text
FROM(SELECT lower(REPLACE(column_name,'O_','')) column_name , /*changing O to O_*/
lower(replace(t.table_name,'_A_','_')) table_name,
lower(t.table_name) table_name1,
c.column_id
FROM all_tab_columns c,
(SELECT object_name table_name
FROM all_objects
WHERE object_name LIKE '%/_A/_%' ESCAPE '/') t
WHERE c.table_name(+) = t.table_name
AND SUBSTR(column_name(+),1,2) = 'O_'))