Update 
       "tbl_Emp-Phn"
set 
       "Notes" = NULL
Where 
          "employee-ID" = '777'
 and   "Phone Number" Like  '%00'


;

Update 
       "tbl_Emp-Phn"
set 
       "Notes" = ''
Where 
          "employee-ID" = '777'
 and   "Phone Number" Like  '__________1___'


;