函數索引提高了擴展性
create or replace function getUpper(sName varchar2)
return varchar2
deterministic
as
---告訴oracle此函數是確定性 ——告訴oracle,給定相同值,不論調多少次,都會輸出相同值。
begin
return upper(sName);
end;
create index ind_emp_fun on emp(getUpper(name));
select * from emp where getUpper(name)='SS'