Hi @Piemur1,

You could try writing your script like this.

var needit_gr = new GlideRecord('insert_the_name_of_the_needit_table');
needit_gr.addNullQuery('u_requested_for_email');
needit_gr.setLimit(100);
needit_gr.query();

while(needit_gr.next()){
    needit_gr.setValue('u_requested_for_email', needit_gr.u_requested_for.email);
    needit_gr.update();
}

Hope this helps.