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Why do you expect the last line to be removed?
- It is not a duplicate since "Michale" != "Michael"
- It doesn't match the pattern either.

In any case, try this:

...

If there is any chance that the duplicated lines won't be adjacent, awk may be a much better tool for this than vi.

In addition to the misspelling on the last input line; why shouldn't the header...

There are some issues:
* you never actually connect to any database (have a look at the SQL*Plus command connect)
* you need to feed the commands you wish to run to SQL*Plus. Here-documents or...

Will the other users use the ksh script or will they access the database via other tools?
If the users access the database via other tools: is it enough to display the results so the users can...