Oracle SQL

drop table t; -- если надо
create table t as
WITH r AS (
select /*+ materialize */ * from ALL_OBJECTS WHERE ROWNUM < 100 )
select object_id as id,length(r.object_name) as fid,
 (select count(1) from r a where length(r.object_name) = length(a.object_name))  as price   
from r

select sum(price) sm from t 

select sum(distinct price) sm from t 

select sum(price distinct fid) sm from t

select sum(distinct to_number(rpad(fid,10,'0')) +price) -  sum(distinct to_number(rpad(fid,10,'0'))) as sm  from t

  select r from  t 
   model
   return updated rows   
   dimension by(id)
  measures(0 r, nullif(price, lag(price)over(partition by fid order by id)) lg)
  rules upsert(r[0] = sum(lg)[any])

WITH
 PROCEDURE <NAME_PROCEDURE> 
 BEGIN
 ... 
 END;

 FUNCTION <NAME_FUNCTION>
 BEGIN
   ...
 END;
SELECT <NAME_FUNCTION>
FROM <TABLE>;

WITH
  FUNCTION reversive_fnc(p_name VARCHAR2) RETURN VARCHAR2
  is i NUMBER; v VARCHAR2(50);
  begin
    FOR i IN 1..LENGTH(p_name) LOOP
      v := v || SUBSTR(p_name, LENGTH(p_name)-i+1, 1);
    END LOOP; 
    return v; 
  end;
SELECT DISTINCT reversive_fnc(object_type) as rname, object_type FROM all_objects WHERE rownum < 101;

WITH
  FUNCTION incid_fnc(p_id NUMBER, p_count NUMBER) RETURN NUMBER
  is
  begin     
    return TO_NUMBER(rpad(p_id , p_count, '0')); 
  end;
SELECT object_id, incid_fnc(object_id, 10) fn FROM all_objects WHERE rownum < 101

BULK FETCH statement
BULK EXECUTE IMMEDIATE statement
FORALL statement
COLLECT INTO clause
RETURNING INTO clause
%BULK_ROWCOUNT cursor attribute

EXECUTE IMMEDIATE dynamic_string
   [[BULK COLLECT] INTO define_variable[, define_variable ...]]
   [USING bind_argument[, bind_argument ...]]
   [{RETURNING | RETURN} 
   BULK COLLECT INTO bind_argument[, bind_argument ...]];