Oracle Database can do that with a feature called 'SQL Macros'
https://docs.oracle.com/en/database/oracle/oracle-database/2...
SQL> create table test_pallets (pallet_id number);
Table created.
SQL> insert into test_pallets values (1),(2),(3),(4);
4 rows created.
SQL> create table test_boxes (pallet_id number, mass decimal);
Table created.
SQL> insert into test_boxes values (1,10),(1,20),(2, 5),(4, 5),(4, 50);
5 rows created.
SQL> create function pallet_payload_mass(
2 p dbms_tf.table_t,
3 b dbms_tf.table_t
4 ) return clob SQL_Macro as
5 begin
6 return q'{
7 select
8 p.pallet_id,
9 coalesce(sum(b.mass), 0) as payload_mass
10 from
11 p
12 left outer join
13 b on b.pallet_id = p.pallet_id
14 group by
15 p.pallet_id
16 }';
17 end;
18 /
Function created.
SQL> select payload_mass, pallet_id
2 from pallet_payload_mass(test_pallets, test_boxes)
3 order by payload_mass;
PAYLOAD_MASS PALLET_ID
------------ ----------
0 3
5 2
30 1
55 4
