mySQL and Relational Databases

mySQL and Relational Databases By Jeff Smith

mySQL and Relational Databases What is a Database? ,[object Object],[object Object],[object Object]

What is a Table ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Table Concepts and Terms -1 ,[object Object],[object Object],[object Object]

Table Concepts and Terms -2 Table: PhoneBook Columns or Fields: Company, Address, City, State, Zip, Phone

Keys of a Table -1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Keys of a Table -2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],MODEL_GROUP ---------------------------------- MODEL_GROUP_ID (PK) USER_ID (FK) MODEL_GROUP_NAME

Indexes (Indicies) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Referential and Domain Integrity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

About mySQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setting up a mySQL Database - 1 ,[object Object],[object Object],[object Object],[object Object]

MySQL Table Engines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MySQL Data Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setting Up Database With A Script ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setting up a Database - 3 ,[object Object]

Basic SQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, SELECT statement -1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, SELECT statement -4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, SELECT statement -5 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, SELECT statement -6 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, INSERT statement -1 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, INSERT statement -2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, UPDATE statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Basic SQL, DELETE statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common MySQL Commands -1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common MySQL Commands -2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common MySQL Commands -3 alter table [table name] drop index [colmn name]; Delete unique from table. alter table [table name] modify [column name] VARCHAR(3); Make a column bigger. alter table [table name] add unique ([column name]); Make a unique column so you get no dupes. alter table [table name] change [old column name] [new column name] varchar (50); Change column name. alter table [table name] add column [new column name] varchar (20); Add a new column to db. alter table [table name] drop column [column name]; Delete a column.

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]

Squirrel SQL Client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Squirrel SQL Client Installation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Squirrel SQL Client Installation -1 ,[object Object]

Squirrel SQL Client Installation -4 ,[object Object],[object Object],[object Object]

Squirrel SQL Client Installation -8 ,[object Object],[object Object]

WHERE Clause ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Selecting the COUNT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Selecting the MIN or MAX ,[object Object],[object Object],[object Object],[object Object],[object Object]

Selecting the SUM ,[object Object],[object Object],[object Object],[object Object],[object Object]

Joining Tables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sub Queries -1 ,[object Object],[object Object],[object Object],[object Object]

Sub Queries -1 ,[object Object],SELECT name FROM employee E WHERE E.dept_no = (SELECT dept_no FROM employee WHERE name = 'Zirsky') This selects the names of all the people who work in the same department as ‘Zirsky’ This sub query must return a single row (or no rows) since the Comparator is an ‘=‘ (equals sign). If there are two ‘Zirsky’s, you’ll get a SQL error

Sub Queries -2 ,[object Object],[object Object],SELECT name FROM employee E WHERE E.dept_no IN (SELECT dept_no FROM employee WHERE name = 'Zirsky‘ OR name = ‘Thompson’) This selects the names of all the people who work in the same department as ‘Zirsky’ or ‘Thompson’

Correlated Sub Queries -2 ,[object Object],SELECT name FROM employee E WHERE E.employee_id NOT IN (SELECT employee_id FROM benefits) This selects the names of all the people who are not in the benefits table (they have no benefits)

Aggregate Selects (GROUP BY) -1 ,[object Object],[object Object],SELECT count(*), E.name FROM employee E, doctor_visits DV WHERE E.emp_id = DV.emp_id GROUP BY E.name This selects the employee names and number of doctor visits they’ve had. For example 4 John Doe 2 Maggie Smith

Aggregate Selects (GROUP BY) -2 ,[object Object],SELECT count(*), E.name FROM employee E, doctor_visits DV WHERE E.emp_id = DV.emp_id GROUP BY E.name This selects the employee names and number of doctor visits they’ve had. For example 4 John Doe 2 Maggie Smith 3 Tom Jones

Aggregate Selects (GROUP BY) -3 ,[object Object],SELECT count(E.name), E.name FROM employee E, doctor_visits DV WHERE E.emp_id = DV.emp_id GROUP BY E.name HAVING (COUNT(E.name) > 2) This selects the employee names and number of doctor visits they’ve had IF they’ve had more than 2 visits. For example 4 John Doe 3 Tom Jones

Outer Joins -1 ,[object Object],[object Object],[object Object],[object Object]

Outer Joins -2 ,[object Object],SELECT E.name FROM employee E LEFT OUTER JOIN DOCTOR_VISITS DV ON E.emp_id = DV.emp_id Selects employee names and doctor visits, one row per doctor visit. If the employee has no doctor visits, his name still appears in the results, but with NULL values for doctor visits. In this example, John Doe had a doctor visit while Tom Jones did not. E.Name DV.Date DV.Reason ---------------------------------------------------- John Doe 02/10/2005 Sore throat Tom Jones NULL NULL

Outer Joins -2 ,[object Object],SELECT E.name FROM employee E LEFT OUTER JOIN DOCTOR_VISITS DV ON E.emp_id = DV.emp_id WHERE DV.emp_id IS NULL Selects employee names who have no doctor visits E.Name DV.Date DV.Reason ---------------------------------------------------- Tom Jones NULL NULL

What We Didn’t Cover ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MySQL Exercise -1 ,[object Object],[object Object],STUDENT ------------------- STUDENT_ID (PK) FIRST_NAME LAST_NAME GENDER (CHAR ‘M’ or ‘F’) First name/Last name combo Must Be unique COURSE ---------------------------------- COURSE_ID (PK) COURSE_NAME COURSE_NUMBER (INT) Course Name/Number combo should be unique

MySQL Exercise -2 REGISTRATION ---------------------- REGISTRATION_ID (PK) STUDENT_ID COURSE_ID STUDENT_ID and COURSE_ID should be foreign keys

MySQL Exercise -3 ,[object Object],STUDENTS ---------------- John Doe Tom Jones Sally Smith Jennifer Smith COURSES --------------- Physics 101 French 101 French 201 REGISTRATIONS ------------------------ John Doe, Sally Smith, Tom Jones in Physics 101 Tom Jones in French 101 Sally Smith in French 201

MySQL Exercise -4 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MySQL Exercise -5 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MySQL Exercise -6 ,[object Object],[object Object],[object Object],[object Object],[object Object]

mySQL and Relational Databases

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