Using OVER() if customer has watch gladiator then 1 else 0 SQL SERVER

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%\'         


        

Answer 1

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.