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question about lookup

I have to insert data to tables for these conditions
  if the insert record is not on the table at all
    or
  if the data on the new record is different.
Either way it looks like I have to try to select the data
from the table first.

Is the lookup function or procedure,  I keep seeing people mention
in this newsgroup good for this.
If so anybody have an example of how to use it
thanks