查Oracle函数文档 https://docs.oracle.com/cd/E11882_01/server.112/e41084/functions.htm#SQLRF006  ,没有找到得到uuid的函数,自己造一个。

create or replace function uuid
return varchar 
is
guid varchar(32);
begin
guid := lower(rawtohex(sys_guid()));
return substr(guid,1,8)||'-'||substr(guid,9,4)||'-'||substr(guid,13,4)||'-'||substr(guid,17,4)||'-'||substr(guid,21,12);
end ;