Changing a varchar2 field to uppercase

owercase.

You can make the change to all current rows with a single update statement as follows:

UPDATE my_table
   SET my_column = UPPER(my_column) ;

CREATE TRIGGER make_upper
BEFORE UPDATE OR INSERT ON my_table
FOR EACH ROW
begin
  :new.my_column := upper(:new.my_column) ;
end ;
/

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