Oracle query logic to identify email addresses across the dwh schemas - oracle

Question

I was performing an activity to identify eMail addresses based on certain pattern (#xyz.de). I initially tried checking the DBA_TAB_COLS [data dictionary] view but this just finds email column names and I manually need to check the big list of tables. Instead of doing that, is there is a more effective way to just fetch the the pattern value #xyz.de ?
Database - oracle 11g
Query used
SET SERVEROUTPUT ON 100000
DECLARE
lv_count number(10):=0;
l_str varchar2 (1000);
lv_col_name varchar2(255) :='EMAIL';
BEGIN
FOR V1 IN
(select distinct table_name
from dba_tab_columns
where column_name = lv_col_name
order by table_name)
LOOP
dbms_output.put_line(lv_col_name||' '||v1.table_name);
END LOOP;
END;
Please note that
I don't exactly know the table or column names.
The value #xyz.de can be in any schema and any table and any column. This has to be identified but in an effective way.
Any suggestions?
i have used the above block query to fetch the email column along with the table name , but how can i achieve by searching certain value #xyz.de using the dynamic sql ?

Answer 1

I don't know what you want to do with the values that you are trying to extract, so the below code just prints them. Refer to PL/SQL Dynamic SQL from the Oracle documentation.
declare
type EMAILS is ref cursor;
L_CURSOR EMAILS;
cursor EMAIL_COLS is
select OWNER
,TABLE_NAME
,COLUMN_NAME
from DBA_TAB_COLS
where COLUMN_NAME like '%EMAIL%'
and OWNER <> 'SYS';
L_SQL varchar2(200);
L_EMAIL varchar2(500);
begin
for REC in EMAIL_COLS
loop
L_SQL := 'select ' || REC.COLUMN_NAME || ' from ' || REC.OWNER || '.' || REC.TABLE_NAME || ' where ' || REC.COLUMN_NAME || ' like ''%xyz.de''';
open L_CURSOR for L_SQL;
loop
fetch L_CURSOR into L_EMAIL;
exit when L_CURSOR%notfound;
DBMS_OUTPUT.PUT_LINE(L_EMAIL);
end loop;
end loop;
end;