Film genre more rented by client.

Question

Hi,
I need a list with customer name, and most rented movie genre.
Database Schema:
genres (id_genre, name)
movies (id_movie, id_genre, title)
dvds (id_dvd, id_movie)
customers (id_customer, name)
rents (id_rent, id_customer, id_dvd, date)
I need something like:
John, Action
Paul, Action
Mary, Adventure
Christine, Drama
Daniel Horror
Victoria, Romance
Neal, Romance
Thanks!

Answer 1

1009991 wrote:
Hi,
I need a list with customer name, and most rented movie genre.
Database Schema:
genres (id_genre, name)
movies (id_movie, id_genre, title)
dvds (id_dvd, id_movie)
customers (id_customer, name)
rents (id_rent, id_customer, id_dvd, date)
I need something like:
John, Action
Paul, Action
Mary, Adventure
Christine, Drama
Daniel Horror
Victoria, Romance
Neal, Romance
Thanks!Hi,
Kindly post the sample data !!!
with data_genres AS
SELECT 100 as id_genre,'ACTION' AS name
from dual
UNION ALL
SELECT 200,'ADVENTURE' from dual
UNION ALL
SELECT 300,'HORROR' from dual
UNION ALL
SELECT 400,'ROMANCE' from dual )
data_movies AS
SELECT 1 AS id_movie,100 AS id_genre,'MIB' AS TITLE
from dual
UNION ALL
SELECT 2,200,'LOST WORLD' from dual
UNION ALL
SELECT 3,300,'EVILDEAD' from dual
UNION ALL
SELECT 4,300,'DARKHORSE' from dual
UNION ALL
SELECT 5,400,'TITANIC' from dual
data_customer AS
SELECT 101 AS id_customer,'JOHN' AS NAME from dual
UNION ALL
SELECT 102,'PAUL' from dual
UNION ALL
SELECT 103,'MARY' from dual
UNION ALL
SELECT 104,'Christine' from dual
data_rents AS
SELECT 'R101' AS RENT_ID,101 AS id_customer,'DVD001' AS id_dvd ,'01-JUN-2013' AS Rent_dt
FROM DUAL
UNION ALL
SELECT 'R102',101,'DVD002','03-JUN-2013' FROM DUAL
UNION ALL
SELECT 'R103',102,'DVD001','04-JUN-2013' from dual
UNION ALL
SELECT 'R104',102,'DVD001','05-JUN-2013' from dual
UNION ALL
SELECT 'R104',103,'DVD003','06-JUN-2013' from dual
data_dvds AS
SELECT 'DVD001' AS id_dvd,1 as id_movie from dual
UNION ALL
SELECT 'DVD002',2 from dual
UNION ALL
SELECT 'DVD003',3 from dual
UNION ALL
SELECT 'DVD004',4 from dual
SELECT data_customer.name,Rent_dt,data_movies.TITLE,data_genres.name
FROM data_customer,data_dvds,data_rents,data_genres,data_movies
WHERE data_customer.id_customer=data_rents.id_customer
AND data_rents.id_dvd=data_dvds.id_dvd
AND data_genres.id_genre=data_movies.id_genre
AND data_dvds.id_movie=data_movies.id_movieOutput I would get
SQL> /
NAME      RENT_DT     TITLE      NAME
PAUL      05-JUN-2013 MIB        ACTION
PAUL      04-JUN-2013 MIB        ACTION
JOHN      01-JUN-2013 MIB        ACTION
JOHN      03-JUN-2013 LOST WORLD ADVENTURE
MARY      06-JUN-2013 EVILDEAD   HORRORto get the latest genre taken by each customer modify the query using analytical function
SELECT a.name,a.genre_name
FROM (
SELECT data_customer.id_customer,data_customer.name,Rent_dt,data_movies.TITLE,data_genres.name genre_name,
rank()OVER(partition by data_customer.id_customer ORDER BY to_char(to_date(Rent_dt),'DD-MON-YYYY') DESC) RNK
FROM data_customer,data_dvds,data_rents,data_genres,data_movies
WHERE data_customer.id_customer=data_rents.id_customer
AND data_rents.id_dvd=data_dvds.id_dvd
AND data_genres.id_genre=data_movies.id_genre
AND data_dvds.id_movie=data_movies.id_movie)a
WHERE a.rnk=1Output would be
SQL> with data_genres AS
  2  (
  3  SELECT 100 as id_genre,'ACTION' AS name
  4  from dual
  5  UNION ALL
  6  SELECT 200,'ADVENTURE' from dual
  7  UNION ALL
  8  SELECT 300,'HORROR' from dual
  9  UNION ALL
10  SELECT 400,'ROMANCE' from dual )
11  ,
12  data_movies AS
13  (
14  SELECT 1 AS id_movie,100 AS id_genre,'MIB' AS TITLE
15  from dual
16  UNION ALL
17  SELECT 2,200,'LOST WORLD' from dual
18  UNION ALL
19  SELECT 3,300,'EVILDEAD' from dual
20  UNION ALL
21  SELECT 4,300,'DARKHORSE' from dual
22  UNION ALL
23  SELECT 5,400,'TITANIC' from dual
24  )
25  ,
26  data_customer AS
27   (
28   SELECT 101 AS id_customer,'JOHN' AS NAME from dual
29   UNION ALL
30   SELECT 102,'PAUL' from dual
31   UNION ALL
32   SELECT 103,'MARY' from dual
33   UNION ALL
34   SELECT 104,'Christine' from dual
35   ),
36  data_rents AS
37  (
38  SELECT 'R101' AS RENT_ID,101 AS id_customer,'DVD001' AS id_dvd ,'01-JUN-2013' AS Rent_dt
39  FROM DUAL
40  UNION ALL
41  SELECT 'R102',101,'DVD002','03-JUN-2013' FROM DUAL
42  UNION ALL
43  SELECT 'R103',102,'DVD001','04-JUN-2013' from dual
44  UNION ALL
45  SELECT 'R104',102,'DVD001','05-JUN-2013' from dual
46  UNION ALL
47  SELECT 'R104',103,'DVD003','06-JUN-2013' from dual
48  ),
49  data_dvds AS
50  (
51  SELECT 'DVD001' AS id_dvd,1 as id_movie from dual
52  UNION ALL
53  SELECT 'DVD002',2 from dual
54  UNION ALL
55  SELECT 'DVD003',3 from dual
56  UNION ALL
57  SELECT 'DVD004',4 from dual
58  )
59  SELECT a.name,a.genre_name
60  FROM (
61  SELECT data_customer.id_customer,data_customer.name,Rent_dt,data_movies.TITLE,data_genres.name
genre_name,
62  rank()OVER(partition by data_customer.id_customer ORDER BY to_char(to_date(Rent_dt),'DD-MON-YYY
Y') DESC) RNK
63  FROM data_customer,data_dvds,data_rents,data_genres,data_movies
64  WHERE data_customer.id_customer=data_rents.id_customer
65  AND data_rents.id_dvd=data_dvds.id_dvd
66  AND data_genres.id_genre=data_movies.id_genre
67  AND data_dvds.id_movie=data_movies.id_movie)a
68  WHERE a.rnk=1
69  /
NAME      GENRE_NAM
JOHN      ADVENTURE
PAUL      ACTION
MARY      HORROR
SQL> Hope this helps!
Regards,
Achyut Kotekal