SQL代写代考

11/5/2018 Quiz: Final Exam https://canvas.du.edu/courses/80278/quizzes/58545/take 1/11 Final Exam Started: Nov 5 at 9:08am Quiz Instruc�ons Final Exam (Access granted in Week 9 (Monday, November 5, 2018 at 12:00 AM), due Week 10 (Monday, November 12, 2018 by 11:59 PM MT)) 1 ptsQuestion 1 Add the customers to the db_denydatareader fixed database role. Create a view.

Slide 1 SQL (MySQL) MySQL and Set SQL discussed in previous lecture are for Oracle. However, mysql does not support the following SQL operations! minus / except intersect What should we do? Write the query in an alternative way. Use our knowledge in relational algebra! SQL (MySQL) Relational algebra Revisit Set Union ∪ Set difference

SQL SQL (Note that the character ‘#’ is used in examples throughout but in most cases is not legal in SQL.] Simple SELECT select some data (column name(s)) from some table(s) (table names(s)) where condition (retrieved tuple(s)) select s#, sname, city from s where status >= 20; select * from s; (we use * as

SQL: Queries, Constraints, Triggers SQL Nested Queries CS430/630 Lecture 6 Slides based on “Database Management Systems” 3rd ed, Ramakrishnan and Gehrke Nested Queries  An SQL query can be used to help the evaluation of another query  E.g., a condition may need to be evaluated on a computed relation, not one readily available 