Complex SQL query help

Question

Hi,
I was wondering if I could have some help with the query I have below for this general data set, please? I need to do it in a single SQL statement. We're currently running Oracle 10g. The piece I'm struggling with is identifying that the person has all the items in a collection and to include the collection in the resulting collection of items.
persons_items
person     item
Ted          cup
Ted          saucer
Ted          plate
Ted          fork
Alice          book
Alice          thimble
Alice          knife
Alice          cup
Joe          cup
Joe          saucer
Joe          plate
Joe          knife
Joe          fork
Joe          spoon
Jessica     spatula
Jessica     dish
collections
collection_name     item
crockery     cup
crockery     saucer
crockery     plate
cutlery          knife
cutlery          fork
cutlery          spoon
Query:
What single items and collections does Ted have?     fork, crockery
What single items and collections does Alice have?     book, thimble, knife, cup
What single items and collections does Joe have?     crockery, cutlery
What single items and collections does Jessica have?     spatula, dish
Thanks in advance.
Pat

Answer 1

Expanding on Brendan's solution...
For 11g:
SQL> ed
Wrote file afiedt.buf
  1  WITH person_items AS (
  2          SELECT 'Ted' person, 'cup' item FROM DUAL UNION
  3          SELECT 'Ted', 'saucer' FROM DUAL UNION
  4          SELECT 'Ted', 'plate' FROM DUAL UNION
  5          SELECT 'Ted', 'fork' FROM DUAL UNION
  6          SELECT 'Alice', 'book' FROM DUAL UNION
  7          SELECT 'Alice', 'thimble' FROM DUAL UNION
  8          SELECT 'Alice', 'knife' FROM DUAL UNION
  9          SELECT 'Alice', 'cup' FROM DUAL UNION
10          SELECT 'Joe', 'cup' FROM DUAL UNION
11          SELECT 'Joe', 'saucer' FROM DUAL UNION
12          SELECT 'Joe', 'plate' FROM DUAL UNION
13          SELECT 'Joe', 'knife' FROM DUAL UNION
14          SELECT 'Joe', 'fork' FROM DUAL UNION
15          SELECT 'Joe', 'spoon' FROM DUAL UNION
16          SELECT 'Jessica', 'spatula' FROM DUAL UNION
17          SELECT 'Jessica', 'dish' FROM DUAL
18  ), collections AS (
19          SELECT 'crockery' collection_name, 'cup' item FROM DUAL UNION
20          SELECT 'crockery', 'saucer' FROM DUAL UNION
21          SELECT 'crockery', 'plate' FROM DUAL UNION
22          SELECT 'cutlery', 'knife' FROM DUAL UNION
23          SELECT 'cutlery', 'fork' FROM DUAL UNION
24          SELECT 'cutlery', 'spoon' FROM DUAL
25  ), person_item_colls AS (
26          SELECT pi.person, pi.item, co.collection_name,
27                 Count(*) OVER (PARTITION BY pi.person, co.collection_name) n_col
28            FROM person_items pi
29            LEFT JOIN collections co
30              ON co.item = pi.item
31  )
32  select person, listagg(collection_name,',') within group (order by collection_name) as collections
33  from (
34        SELECT DISTINCT person, collection_name
35        FROM   person_item_colls
36        WHERE  collection_name IS NOT NULL
37        AND    n_col > 1
38        UNION ALL
39        SELECT person, item
40        FROM   person_item_colls
41        WHERE  collection_name IS NULL
42        OR     n_col = 1
43       )
44* group by person
SQL> /
PERSON  COLLECTIONS
Alice   book,cup,knife,thimble
Jessica dish,spatula
Joe     crockery,cutlery
Ted     crockery,forkFor 10g:
SQL> ed
Wrote file afiedt.buf
  1  WITH person_items AS (
  2          SELECT 'Ted' person, 'cup' item FROM DUAL UNION
  3          SELECT 'Ted', 'saucer' FROM DUAL UNION
  4          SELECT 'Ted', 'plate' FROM DUAL UNION
  5          SELECT 'Ted', 'fork' FROM DUAL UNION
  6          SELECT 'Alice', 'book' FROM DUAL UNION
  7          SELECT 'Alice', 'thimble' FROM DUAL UNION
  8          SELECT 'Alice', 'knife' FROM DUAL UNION
  9          SELECT 'Alice', 'cup' FROM DUAL UNION
10          SELECT 'Joe', 'cup' FROM DUAL UNION
11          SELECT 'Joe', 'saucer' FROM DUAL UNION
12          SELECT 'Joe', 'plate' FROM DUAL UNION
13          SELECT 'Joe', 'knife' FROM DUAL UNION
14          SELECT 'Joe', 'fork' FROM DUAL UNION
15          SELECT 'Joe', 'spoon' FROM DUAL UNION
16          SELECT 'Jessica', 'spatula' FROM DUAL UNION
17          SELECT 'Jessica', 'dish' FROM DUAL
18  ), collections AS (
19          SELECT 'crockery' collection_name, 'cup' item FROM DUAL UNION
20          SELECT 'crockery', 'saucer' FROM DUAL UNION
21          SELECT 'crockery', 'plate' FROM DUAL UNION
22          SELECT 'cutlery', 'knife' FROM DUAL UNION
23          SELECT 'cutlery', 'fork' FROM DUAL UNION
24          SELECT 'cutlery', 'spoon' FROM DUAL
25  ), person_item_colls AS (
26          SELECT pi.person, pi.item, co.collection_name,
27                 Count(*) OVER (PARTITION BY pi.person, co.collection_name) n_col
28            FROM person_items pi
29            LEFT JOIN collections co
30              ON co.item = pi.item
31  )
32  select person, ltrim(sys_connect_by_path(collection_name,','),',') as collections
33  from (
34        select person, collection_name, row_number() over (partition by person order by collection_name) as rn
35        from (
36              SELECT DISTINCT person, collection_name
37              FROM   person_item_colls
38              WHERE  collection_name IS NOT NULL
39              AND    n_col > 1
40              UNION ALL
41              SELECT person, item
42              FROM   person_item_colls
43              WHERE  collection_name IS NULL
44              OR     n_col = 1
45             )
46        )
47  where connect_by_isleaf = 1
48  connect by person = prior person and rn = prior rn + 1
49* start with rn = 1
SQL> /
PERSON  COLLECTIONS
Alice   book,cup,knife,thimble
Jessica dish,spatula
Joe     crockery,cutlery
Ted     crockery,fork