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CT 100 Week 6. SQL. Quiz 6 Vocabulary. All quiz 5 vocabulary and the following new terms and the following new terms. 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.

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Quiz 6 vocabulary
Quiz 6 Vocabulary

  • All quiz 5 vocabulary and the following new termsand the following new terms.

  • 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


Quiz 6 problems
Quiz 6 Problems

  • Translate an English language statement into a Boolean expression

  • Determine if an expression is a well formed Boolean expression

  • 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





Creating tables
Creating Tables

  • Table name

  • Column Names

    • Each column must have a data type

  • Constraints

    • Primary key

    • Foreign key

      • Referential integrity


Creating tables1
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))


Insert rows
Insert Rows

  • insert into Faculty values (‘0001’, ‘David’, ‘Hilbert’, ‘Mathematics’)

  • insert into Student values (‘005’, ’Joshua’,’Goldberg’, ‘Mathematics’, ‘Philosophy’, ‘0001’)

  • Single quotes around values are required for varchar types

  • Varchars are examples of what are usually called strings. Quotes are used to identify literal strings


Queries
Queries

  • A query is a way to extract data that satisfies some condition from a database

  • The condition is expressed as a logic expression


Queries1
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’


General format
General Format

  • Create table

    • Create table TABLENAME(COLUMN NAMES and DATA TYPES)

  • Insert

    • Insert into TABLENAME values (COLUMN VALUES) (COLUMN VALUES) …

  • Select

    • Select COLUMN NAMES from TABLENAMES where CONDITION



In class exercise
In Class Exercise

  • create table student(sid varchar(10) primary key, first varchar(20), last varchar(30), major1 varchar(30), major2 varchar(30));

  • insert into student values ('001','Jane','Green','Computer Science','');

  • select * from student;

  • insert into student values ('002','Mike','Brown','Mathematics','Computer Science'), ('003','Alex','James','Radiation Therapy','');

  • insert into student values ('004','Sue','Lee','Radiation Therapy','Computer Science');

  • insert into student values ('005','Sam','Brower','Mathematics','Computer Science');

  • select * from student;


In class exercise1
In Class Exercise

  • select first, last from Student where major2 = '';

  • select first,last from Student where major1 = 'Computer Science' or major2 = 'Computer Science';

  • select first,last from Student where (major1 = 'Mathematics' and major2 = 'Computer Science') or (major1 = 'Computer Science' and major2 = 'Mathematics');


Save tables
Save Tables

  • sqlite> .output U:ct100A.sql

  • sqlite> .dump student


Restore table
Restore Table

  • sqlite> .read ct100A.sql


Quit sqlite
Quit SQLite

  • sqlite> .quit


Practice problems
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’



Practice problems1
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 = ‘’



Practice problems2
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


Practice problems3
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


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