Oracle - Select where field has lowercase characters

Question

I have a table, users, in an Oracle 9.2.0.6 database. Two of the fields are varchar - last_name and first_name.

When rows are inserted into this table, the first name a

Answer 1

 SELECT * 
 FROM mytable 
 WHERE FIRST_NAME IN (SELECT FIRST_NAME 
                      FROM MY_TABLE
                      MINUS 
                      SELECT UPPER(FIRST_NAME) 
                      FROM MY_TABLE )