FID FIRST LAST DEPARTMENT

Transcription

1 CT 100 SQL 2

2 Faculty Table FID FIRST LAST DEPARTMENT 0001 David Hilbert Mathematics 0002 Clerk Maxwell Physics 0003 Bertrand Russell Philosophy 0004 Ada Byron Computer Science 0005 Mary Everest Mathematics 0006 Gottlob Frege Mathematics 0008 Alan Turing Computer Science 0010 Winifred Merrill Mathematics 0011 Sophie Germain Mathematics 0012 Alonzo Church Computer Science

3 Student Table SID FIRST LAST MAJOR1 MAJOR2 ADVISOR 001 Jane Green Computer Science Mike Brown Physics Mathematics Alex James Computer Science Philosophy Joshua Goldberg Mathematics Philosophy Mary Smith Computer Science Physics Zhang Li Mathematics Physics 0003

4 Advisor Relationship FID SID Advisor

5 Creating Tables Table name Column Names Each column must have a data type Constraints Primary key Foreign key Referential integrity

6 Creating Tables create table Faculty(fid varchar(10) primary key, first varchar(20), last varchar(30), department varchar(30)) create table Student(sid varchar(10) primary key, first varchar(20), last varchar(30), major1 varchar(30), major2 varchar(30), advisor varchar(10) references Faculty(fid))

7 Queries A query is a way to extract data that satisfies some condition from a database The condition is expressed as a logic expression

8 Queries Find the names of Faculty in the Mathematics department Select first, last from Faculty where department = Mathematics Find the names of Students who are Mathematics majors Select first, last from Student where major1 = Mathematic s or major2 = Mathematics

9 General Format Create table Create table TABLENAME(COLUMN NAME DATA TYPE CONSTRAINT, COLUMN NAME DATA TYPE CONSTRAINT, ) The constraint is optional Insert Insert into TABLENAME values (COLUMN VALUE, COLUMN VALUE, ), (COLUMN VALUE, COLUMN VALUE, ) Select Select COLUMN NAME, COLUMN NAME, from TABLENAME, TABLENAME, where CONDITION The condition is an expression that evaluates to true or false

10 Practice Problems Given the faculty table shown on the next page what are the results of the following queries select first, last from Faculty where department = Philosophy select fid from Faculty where department = Mathematics select fid, last from Faculty where department = Mathematics or department = Physics select last from Faculty where department = Mathematics and department = Physics

11 Faculty Table FID FIRST LAST DEPARTMENT 0001 David Hilbert Mathematics 0002 Clerk Maxwell Physics 0003 Bertrand Russell Philosophy 0004 Ada Byron Computer Science 0005 Mary Everest Mathematics 0006 Gottlob Frege Mathematics 0008 Alan Turing Computer Science 0010 Winifred Merrill Mathematics 0011 Sophie Germain Mathematics 0012 Alonzo Church Computer Science 0013 Immanuel Kant Philosophy 0014 Issac Newton Physics

12 Practice Problems Given the student table shown on the next page what are the results of the following queries Select first, last from Student where major1 = Mathematics Select majors2 from Student where major1 = Computer Science Select first, last from Student where major1 = Mathematics or major2 = Mathematics Select first, last from Student where major1 = Philosophy and major2 = Computer Science Select first, last from Student where major2 =

13 Student SID FIRST LAST MAJOR1 MAJOR Jane Green Computer Science 0002 Mike Brown Mathematics Computer Science 0003 Alex James Radiation Therapy 0004 Sue Lee Radiation Therapy Computer Science 0005 Sam Brower Mathematics Computer Science 0006 Bill Hart Philosophy 0007 Cathy Smith Philosophy Computer Science 0008 Marty Jones Computer Science Mathematics 0009 Mary Wen Mathematics 0010 Zach Wheat Mathematics Radiation Therapy 0011 Trevor Olsen Philosophy Computer Science

14 Practice Problems Given the definition of the student and faculty tables write SQL select statements to answer the following questions. Find the fids of faculty in the English department Find the first name and last name of students who are History majors Find the last name of students who are both History majors and Computer Science majors Find the last names of faculty whose first name is Janet and who is a member of the Biology department

15 Practice Problems Find the last names of students who are Biology majors or Chemistry majors Find the last names of faculty in the English department or the History department Find the last names of students who are not Mathematics majors Find the last names of students who are not History majors but are English majors