The three tables below make up the database of a university. In the student table they come memorized the students for each of which is specified the matriculation, name, surname, the course of
degree to which he is enrolled (computer science, mathematics, physics, engineering, etc.) and the average of his marks of exams taken. The courses offered by each class are stored in the course table, while in the table “exam passed” all the exams taken by the students are recorded. Write two triggers:
1. the first to verify the correct taking of an exam and in particular to check that:
to. the exam was taken by a student with a freshman record registered in the student table,
b. the student is enrolled in the degree program corresponding to the degree program indicated in the course table,
c. the grade is a number between 18 and 30,
d. honors are given only in the case of a grade of 30. (like an A plus)
2. the second must update the student average after each insertion, modification (grade) or
elimination of an exam taken.

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.