Q

Changing a varchar2 field to uppercase

Please advise on changing data in a varchar2 column to all uppercase. It currently holds a mix of upper- and lowercase.

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) ;
You could then also "force" all future data entered into that column to be stored in upper case by creating a simple trigger as follows:
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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This was first published in May 2002

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