Build dynamic query depending upon selection of table and columns

Hi ,
I want your views on following requirement :
we r doing generic export to excel functionality .
1.User will select multiple tables and according to tables ,columns on that table will select
2.There can be multiple table
3.depending upon column and table selection , we have to build dynamic query and execute .
Please let me know is it possible .If yes then please tell me how to do above requirement.
Thanks in advance

Hi,
Identifiers cannot be used as bind variables, query are parsed
before evaluate bind variables. Identifiers like table name.
For excel you can use some like this:
SET MARKUP HTML ON ENTMAP ON SPOOL ON PREFORMAT OFF
SPOOL test_xls.xls
SELECT colum1||chr(9)||columN FROM tableName;
or CSV:
SELECT colum1|| ',' ||columN FROM tableName;
SPOOL OFF
SET MARKUP HTML OFF ENTMAP OFF SPOOL OFF PREFORMAT ON
For construct the query i suggest to read "Dynamic SQL Statements":
http://www.java2s.com/Tutorial/Oracle/0440__PL-SQL-Statements/0300__Dynamic-SQL.htm
http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/dynamic.htm
http://docs.oracle.com/cd/B10500_01/appdev.920/a96590/adg09dyn.htm
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:227413938857
--sgc                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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