column|customer_id|not_nullable|number(6)
column|cust_first_name|not_nullable|varchar2(20)
column|cust_last_name|not_nullable|varchar2(20)
column|cust_address|nullable|cust_address_typ
column|phone_numbers|nullable|phone_list_typ
column|nls_language|nullable|varchar2(3)
column|nls_territory|nullable|varchar2(30)
column|credit_limit|nullable|number(9,2)
column|cust_email|nullable|varchar2(30)
column|account_mgr_id|nullable|number(6)
column|cust_geo_location|nullable|mdsys.sdo_geometry
check|(credit_limit <= 5000) 
check|(customer_id > 0) 
pkey|customer_id
fkey|account_mgr_id|hr.employees.employee_id