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select COL1 from TABLE1
where
COL1 = lower(COL1) and
COL1 not in (
select a.COL1
from
TABLE1 a join
TABLE1 b on upper(a.COL1) = upper(b.COL1)
where a.COL1 != b.COL1
)
....+....1....+....2
COL1
john
******** End of data ********