触发器和案例声明

Question

1. 我想编写一个SQL触发器，根据价格图表更改插入数据库的每部新电影的rental_rate。

2. 当我按下ENTER时，命令行转到下一行而不是结束语句。 注意：问题1和2使用相同的代码。

   CREATE TRIGGER trig_rental_rate
   
   ON film
   INSTEAD OF INSERT
   AS
     BEGIN
         INSERT INTO film
         SELECT *,
                CASE
   
                  WHEN (special_features = ‘Trailers’) 
              THEN rental_rate := rental_rate + 0.10;
   
           WHEN (special_features = ‘Commentaries’) 
              THEN rental_rate := rental_rate + 0.50;
   
                  WHEN (special_features = ‘Deleted Scenes’) 
              THEN rental_rate := rental_rate + 0.20;
   
                  WHEN (special_features = ‘Behind the Scenes’) 
              THEN rental_rate := rental_rate + 0.20;
   
                END
         FROM   
               Inserted
     END 
   

Answer 1

结束后按回车键。现在按'/'并按Enter键。您的代码现在将被编译。