Read and Write Excel File

Hi all. I need your need help. I need to know how to read EXCEL FILE and insert it to a certain table. By the way, can anyone tell me how to write to a EXCEL FILE?
Thank you in advance.

READING EXCEL
There are several options how to read excel file - ODBC, on a fly excel-->CSV conversion (if you have 11.2 and want to use external tables preprocessor), ... I put (I think all) options on my BLOG http://jiri.wordpress.com/2010/01/04/load-ms-excel-file-to-oracle-database/
WRITING TO EXCEL
Writing to excel is tricky because there is no direct way from Oracle, here are few tips
1. JAVA - you can create java stored procedure, I did not test this but it's probably doable http://www.java-tips.org/other-api-tips/jexcel/how-to-create-an-excel-file.html
2. Excel XML format - you can use UTL_FILE and write to XML format Excel can read http://blogs.msdn.com/b/brian_jones/archive/2005/06/27/433152.aspx
3. Excel can also read CSV files, but it's plan text file with no formatting. You can use UTL_FILE to easily create CSV (comma separated) file and read it from excel, I have few samples on my blog http://jiri.wordpress.com/2009/03/18/oracle-fast-parallel-data-unload-into-ascii-files/

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