How to overwrite data(tables) in oracle database using import

[shapam]

i want to know tht how to overwrite data(Tables) with existing tables in oracle database.
first i imported some tables using .dmp file then some table_names was in tht .dmp file.
then again i run tht import command with tht same syntax now tht showing some tables are already exist in database.

can anyone help me to fix this warning..

[debasisdas]

If you are using IMP command you need to use the parameter DATA_ONLY.

If you are using IMPDP command you need to use the parameter TABLE_EXISTS_ACTION.