Mysql add new column, repeat column increment suffix

drop trigger if exists trigger_name;

delimiter |

CREATE TRIGGER trigger_name BEFORE INSERT ON table_name
    FOR EACH ROW BEGIN
    declare original_column_name varchar(255);
    declare column_name_counter int;

    set original_column_name = new.column_name;
    set column_name_counter = 1;

    while exists (select true from pc_volumes where name = new.column_name) do
            set new.column_name = concat(original_column_name, '-', column_name_counter);
            set column_name_counter = column_name_counter + 1;
        end while;

END;
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delimiter ;

mysql trigger implementation