Using Rank or OVER() to create 1 or zero column SQL SERVER [duplicate] - sql

Question

I think I need some guidance as to what is wrong in my query. I am trying to do
Watched_Gladiator=CASE WHEN FilmName IN (CASE WHEN FilmName LIKE '%Gladiator%' THEN 1 END) then OVER(PARTITION BY Cust_Nr) THEN 1 ELSE 0 END
Tried this one too:
Watched_Gladiator=CASE WHEN FilmName IN (CASE WHEN FilmName LIKE '%Gladiator%' THEN Filmnamne END) then OVER(PARTITION BY Cust_Nr) THEN 1 ELSE 0 END
The Error I am currently getting is this:
Incorrect syntax near the keyword 'OVER'.
This is basically how my data looks like
Cust_Nr Date FilmName Watched Gladiator
157649306 20150430 Gladiator 1
158470722 20150504 Nick Cave: 20,000 Days On Earth 0
158467945 20150504 Out Of The Furnace 0
158470531 20150504 FilmA 0
157649306 20150510 Gladiator 1
158470722 20150515 Gladiator 1
I want to create a column (1 or zero) that shows if the customer has watched Gladiator then 1 ELSE 0. How can I do that?
I created a test column trying with a simple LIKE '%Gladiator%' THEN 1 ELSE 0. The problem with this solution is that it will show 1(one) more than once if the customer has watched multiple times. I only need 1 or zero.
I feel I am really close to finding a solution. I am very new to using OVER() and CASE WHEN but enjoying the thrill:=)

Answer 1

So you're saying that:
SELECT Cust_Nr, Date, FilmName,
CASE WHEN FilmName LIKE '%Gladiator%' THEN 1 ELSE 0 END as WatchedGladiator
FROM YourTable
WHERE YourColumn = #somevalue
Doesn't work? Because according to the data you've given, it should.
EDIT:
Well based on Tim's comment, I would simply add this bit to the query.
SELECT Cust_Nr, Date, FilmName, WatchedGladiator
FROM
(
SELECT Cust_Nr, Date, FilmName,
CASE WHEN FilmName LIKE '%Gladiator%' THEN 1 ELSE 0 END as WatchedGladiator
FROM YourTable
WHERE YourColumn = #somevalue
) as wg
WHERE WatchedGladiator = 1

Answer 2

The following does what you want for all films:
select r.*,
(case when row_number() over (partition by filmname order by date) = 1
then 1 else 0
end) as IsWatchedFirstAndGladiator
from results r;
For just Gladiator:
select r.*,
(case when filmname = 'Gladiator' and row_number() over (partition by filmname order by date) = 1
then 1 else 0
end) as IsWatchedFirst
from results r;

Answer 3

So you want to group by customer and add a column if this customer watched a specific film?
You could do:
SELECT Cust_Nr, MAX(Watched_Gladiator)
FROM( SELECT Cust_Nr,
Watched_Gladiator = CASE WHEN EXISTS
(
SELECT 1 FROM CustomerFilm c2
WHERE c2.Cust_Nr = c1.Cust_Nr
AND c2.FilmName LIKE '%Gladiator%'
) THEN 1 ELSE 0 END
FROM CustomerFilm c1 ) X
GROUP BY Cust_Nr
Demo
But it would be easier if you used the customer-table instead of this table, then you don't need the group-by.

Answer 4

Try grouping up to the cust/film level:
select
cust_nbr,
case when film_name like '%Gladiator%' then 1 else 0 end
from
(
select
cust_nbr,
film_name
from
<your table>
group by
cust_nbr,
film_name
) t
Or, as an alternative:
select distinct cust_nbr
from
<your table>
where
filmname = 'Gladiator'