Caché Web Applications Tutorial
The TopCategory Query
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Here is the TopCategory query. Add it to Cinema.Film.

Query TopCategory(P1 As %Library.String) As %Library.SQLQuery(CONTAINID = 1)
{
 SELECT TOP 3 ID, Description, Length, Rating, Title, Category->CategoryName
 FROM Film
 WHERE (PlayingNow = 1) AND (Category = :P1)
 ORDER BY TicketsSold DESC
}