Upper Case retrieval of Data - Possible ?

As part of porting an Application from SQL*Server to Oracle, when using
SQL/PLSQL etc we need to retrieve Data in UPPER Case "Database-wide" 

irrespective of Case of storage of data within the field of Table/Index.




Wish to Avoid specifying UPPER Clause in the where Query.



NOTE - Data may be stored in Upper or Lower Case in Different fields of
the Table.



NOTE - In the Previous T-SQL Code on SQL*Server the UPPER Clause was NOT
needed.



Is it possible?



Target Oracle ver = 9.2





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