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Chapter 4

Chapter 4. Introduction to MySQL. MySQL. “the world’s most popular open-source database application” “commonly used with PHP”. Relational Database. On cscdb.nku.edu, you have a database db_username (ex. db_frank ) Collection of tables look like Excel spreadsheets.

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Chapter 4

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  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 cscdb.nku.edu, you have a database db_username (ex. db_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 -128..127, unsigned 0..255)

  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 • AUTOINCREMNT PRIMARY KEY • 1, 2, 3, 4, … - assign each record an id

  11. MySQL Client • mysql.exe • mysql –h cscdb.nku.edu – u username –p

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