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CT 100 Week 7

CT 100 Week 7. SQL Queries. Quiz 7 Vocabulary. Logic Gate An electronic device that implements a Boolean Operator Relational Database A database in which all the data is stored in relations. Relations are commonly thought of as tables with rows and columns. SQL

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CT 100 Week 7

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  1. CT 100 Week 7 SQL Queries

  2. Quiz 7 Vocabulary • Logic Gate • An electronic device that implements a Boolean Operator • Relational Database • A database in which all the data is stored in relations. Relations are commonly thought of as tables with rows and columns. • SQL • The standard relational database language. It can be used to specify the structure of the database, to query the database and to modify the contents of the database.

  3. Quiz 7 Vocabulary • Primary key • One or more columns that uniquely identify each row in a table • Foreign key • One or more columns in one table the references the primary key in another table

  4. Quiz 7 Vocabulary • Referential Integrity • A foreign key value is either null or its value appears in the referenced table • Cartesian Product of Tables • The Cartesian product of two tables is a new table containing every row of the first table combined with every row of the second table • Join of Tables • The Join of two tables is a new table in which rows in the first table are combined with rows in the second table based on a common column. The common column does not have to have the same name in both tables and usually represents a primary key/foreign key relationship

  5. Quiz 7 Problems • Implement a Boolean expression with AND, OR and NOT gates • Show the result of SQL queries for the student/faculty database • Write SQL queries for the student/faculty database

  6. Example Faculty Table

  7. Example Student Table

  8. Advisor Relationship

  9. Select Faculty.fid, Student.sid, Student.advisorFrom Faculty, Student

  10. Select Faculty.fid, Student.sid, Student.advisor From Faculty, StudentWhere Faculty.fid = Student.advisor

  11. Select Student.first, Student.last from Faculty, Student where Faculty.fid = Student.advisor and Faculty.department = Student.major1

  12. Select Student.first, Student.last from Faculty, Student where Faculty.fid = Student.advisor and (Faculty.department = Student.major1 or Faculty.department = Student.major2)

  13. Practice Problems • What is the result of the following SQL queries? • Select Student.first, Student.last from Faculty, Student where fid = advisor and department != major1 and department != major2 • Select Faculty.first, Faculty.last from Faculty, Student where fid = advisor and department != major1 and department != major2

  14. Practice Problems • Write SQL select statements to answer the following queries? • Find the majors of students whose first name is Jan. • Find the first and last names of faculty in the Classics department. • Find the department of the advisors of students named Jan.

  15. Practice Problems • Write SQL select statements to answer the following queries? • Find the first and last name of each student who is advised by a faculty member in the Philosophy department. • Find the first and last name of each faculty member who advises a Mathematics major • Find the first and last name of each faculty member who advises a Chemistry major

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