After I write searching code in PL/SQL blocks. I also want to add this post.
If you want to find a specific data in Tables, you may check this page:
http://www.adp-gmbh.ch/ora/misc/find_in_tables.html
SQL> set serveroutput on
SQL>
SQL> begin
2 dbms_output.put_line(find_in_schema(val => ‘147 Spadina Ave’));
3 end;
4 /
rowid: AAAC88AAEAAAAAnAAI in LOCATIONS
Success
PL/SQL procedure successfully completed
SQL>