1. Chapter 4
Introduction to MySQL

2. MySQL “the world’s most popular open-source database application”
“commonly used with PHP”

3. Relational Database
On csweb.hh.nku.edu, you have a database db_spring19_username
(ex. db_spring19_frank)
Collection of tables
look like Excel spreadsheets

4. Relational DB Concepts: Tables
Each table represents a class of objects = a set of objects of the same type / kind
E.g. customers, orders
Table Customers in the db for Book-O-Rama store (running example):
A table has:
A name – Customers
Structure = a number of columns – customerid, name, address, city
Rows – currently, data about 3 customers in this table

5. bookorama.sql
Tables
customers
orders
books
order_items
book_reviews

6. MySQL Data Types CHAR(50) – fixed length character field
TEXT – string with maximum length 65,535 characters
INT – integer
TINYINT – 1 byte integer (signed , unsigned )

7. MySQL Data Types
FLOAT(6,2) - floating point – 6 digits, 2 decimal places
DATE – YYYY-MM-DD
TIMESTAMP – YYYYMMDDHHMMSS (when UPDATE or INSERT is performed)
DOUBLE(10,2) – larger floating point – 10 digits, 2 decimal places

8. MySQL Data Types
DECIMAL(7,2) – for accurate dollars and cents calculations
ENUM(‘M’,’F’) – enumeration of values

9. COLUMN PROPERTIES UNSIGNED- positive numbers and zero NOT NULL
NULL = no value
Must have a value
PRIMARY KEY
Unique
Social Security Number
ISBN

10. COLUMN PROPERTIES AUTOINCREMENT PRIMARY KEY
1, 2, 3, 4, … - assign each record an id

11. MySQL Client
mysql.exe
mysql –h csweb.hh.nku.edu – u username –p