update T_JBXX_JBXX
   set CSRQ = (select substr(SFZJH, 7, 4)
                 from T_JBXX_JBXX||'-'||
                       select substr(SFZJH, 11, 2)
                         from T_JBXX_JBXX || '-' ||
                               select substr(SFZJH, 13, 2) from T_JBXX_JBXX
               
               )数据库SQLupdateselect