Detecting Misspelled Row Column Data in Oracle

Question:  I have an application with a unique key on these four columns:

•  date_of_birth

• first_name

• middle_name

• last_name

My problem is that I have people who are duplicated with misspellings in the names. 

 How can I detect duplicates row column values caused by misspelled surnames and first names?

Answer:  You can join a table against itself to find non-matching rows, in this case matching birth dates and first and middle names.  This syntax will display all people who have matching birth dates, first_name and middle_name, with different last name values:

select
   a.first_name||' '||a.middle_name   first_n_middle_name,
   a.last_name       old,
   a.created_date,
   b.last_name       new,
   b.created_date
from
   person a,
   person b where

-- ********************************************
-- display near matches on last name (surname)
-- ********************************************

   (
    trunc(a.date_of_birth) = trunc(b.date_of_birth)
    and
    a.first_name = b.first_name
    and
    a.middle_name = b.middle_name
    and
    a.last_name <> b.last_name
   );

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