How do I select the max value from multiple tables in one column

I would like to get the last date of records modified. Here is a sample simple SELECT: ``` SELECT t01.name, t01.last_upd date1, t02.last_upd date2, t03.last_upd date3, 'maxof123' maxdate FROM s_org_ext t01, s_org_ext_x t02, s_addr_org t03 WHERE t02.par_row_id(+)= t01.row_id and t03.row_id(+)= t01.pr_addr_id and t01.int_org_flg = 'n'; ``` How can I get column maxdate to display the max of the three dates? Note: no UNION or sub/nested SELECT statements ;)