DBMS - Introduction to MySQL · Introduction to SQL Schemas and Databases A schema is a collection...

Overview of MySQLIntroduction to SQL

DBMS - Introduction to MySQL

Robert Lowe

Division of Mathematics and Computer ScienceMaryville College

February 9, 2016

Robert Lowe DBMS - Introduction to MySQL

Outline

1 Overview of MySQL

2 Introduction to SQL

Outline

1 Overview of MySQL

MySQL Basics

Created by Monty Widenius and David Axmark in 1995One of the "Crown Jewels" of Open Source SoftwareEnterprise class database server with many advancedfeatures

Stored ProceduresTriggersLoad BalancingReplication

Client-Server system, where the MySQL daemon servesboth network and local socket requests.Programmable using SQLMulti-User with robust permissions

MySQL Basics

Created by Monty Widenius and David Axmark in 1995

One of the "Crown Jewels" of Open Source SoftwareEnterprise class database server with many advancedfeatures

MySQL Basics

Created by Monty Widenius and David Axmark in 1995One of the "Crown Jewels" of Open Source Software

Enterprise class database server with many advancedfeatures

MySQL Basics

Client-Server system, where the MySQL daemon servesboth network and local socket requests.

Programmable using SQLMulti-User with robust permissions

MySQL Basics

Client-Server system, where the MySQL daemon servesboth network and local socket requests.Programmable using SQL

Multi-User with robust permissions

MySQL Basics

Schemas and Databases

A schema is a collection of entities and relationships.

MySQL calls a schema a database.A database is the basic boundary within MySQLEntities are stored as rows in tablesAttributes are stored as columnsColumns are strictly typed

A schema is a collection of entities and relationships.MySQL calls a schema a database.

A database is the basic boundary within MySQLEntities are stored as rows in tablesAttributes are stored as columnsColumns are strictly typed

A schema is a collection of entities and relationships.MySQL calls a schema a database.A database is the basic boundary within MySQL

Entities are stored as rows in tablesAttributes are stored as columnsColumns are strictly typed

A schema is a collection of entities and relationships.MySQL calls a schema a database.A database is the basic boundary within MySQLEntities are stored as rows in tables

Attributes are stored as columnsColumns are strictly typed

A schema is a collection of entities and relationships.MySQL calls a schema a database.A database is the basic boundary within MySQLEntities are stored as rows in tablesAttributes are stored as columns

Columns are strictly typed

A schema is a collection of entities and relationships.MySQL calls a schema a database.A database is the basic boundary within MySQLEntities are stored as rows in tablesAttributes are stored as columnsColumns are strictly typed

Overview of Data Types

MySQL stores data in strict types.

MySQL has a complex collection of data types.Numeric TypesString TypesDate and Time Types

MySQL stores data in strict types.MySQL has a complex collection of data types.

Numeric TypesString TypesDate and Time Types

MySQL stores data in strict types.MySQL has a complex collection of data types.Numeric Types

String TypesDate and Time Types

MySQL stores data in strict types.MySQL has a complex collection of data types.Numeric TypesString Types

Date and Time Types

MySQL stores data in strict types.MySQL has a complex collection of data types.Numeric TypesString TypesDate and Time Types

Integer Types

Type Bytes Minimum MaximumTINYINT(M) 1 -128 127

0 255SMALLINT(M) 2 -32768 32767

0 65535INT(M) 4 -2147483648 2147483647

0 4294967295BIGINT(M) 8 -9223372036854775808 9223372036854775807

0 18446744073709551615Note that the M is optional and specifies the display width of the integers.

Real Number Types

Fixed Point Types (Exact Math)DECIMAL(M,D) - Arbitrary precision decimal where M isprecision and d is decimal places.NUMERIC - Synonymous with DECIMALFloating Point TypesFLOAT - Floating point numberDOUBLE PRECISION - Double Precision Floating PointNumber

Bits and Bools

BIT(M) - Specify a bitfield of M bits.BOOL and BOOLEAN - synonyms for TINYINT(1). 0 -false, nonzero - true

String Types

CHAR(M) - Fixed-width character field of M charactersVARCHAR(M) - Variable-width, null-terminated string ofmaximum length MBINARY(M) - Fixed-width binary data of M bytesVARBINARY(M) - Variable-width binary data of max MbytesBLOB - Binary Large Object Arbitrary size binary data.TEXT - Arbitrary sized character data.ENUM - Can store one of several predefined values.SET - You should not use this. Stores lists of values in onecolumn!!!

Date and Time Types

DATE - Stores the dateDATETIME - Stores date and timeTIME - Stores timeTIMESTAMP - UNIX TimestampYEAR - Stores the Year

Launching the Client

Basic launch looks like this:mysql -uuser -p

You can also select a default database.mysql -uuser -p dbname

Basic Commands

Display available databases with SHOW DATABASESDisplay tables in the current database with SHOWTABLESView table structure with DESC tableNameView the currently selected database withSELECT DATABASE();

Basic Commands

Display available databases with SHOW DATABASES

Display tables in the current database with SHOWTABLESView table structure with DESC tableNameView the currently selected database withSELECT DATABASE();

Basic Commands

Display available databases with SHOW DATABASESDisplay tables in the current database with SHOWTABLES

View table structure with DESC tableNameView the currently selected database withSELECT DATABASE();

Basic Commands

Display available databases with SHOW DATABASESDisplay tables in the current database with SHOWTABLESView table structure with DESC tableName

View the currently selected database withSELECT DATABASE();

Basic Commands

Display available databases with SHOW DATABASESDisplay tables in the current database with SHOWTABLESView table structure with DESC tableNameView the currently selected database withSELECT DATABASE();

Designing for MySQL

1 Build an ER Model2 Build a Crow’s Foot Diagram of the Model3 Select Types for All Attributes4 Write Schema Generation Script in SQL

Outline

1 Overview of MySQL

SQL Overview

Design in the 1970’s by Donald Chamberlin and RaymondF. BoyceSpecial Purpose Programming Language - RDBMSDeclarative Procedural Language

SQL Overview

Design in the 1970’s by Donald Chamberlin and RaymondF. Boyce

Special Purpose Programming Language - RDBMSDeclarative Procedural Language

SQL Overview

Design in the 1970’s by Donald Chamberlin and RaymondF. BoyceSpecial Purpose Programming Language - RDBMS

Declarative Procedural Language

SQL Overview

Design in the 1970’s by Donald Chamberlin and RaymondF. BoyceSpecial Purpose Programming Language - RDBMSDeclarative Procedural Language

Structure of a Statement

A statement is a series of clauses which are terminated bya ";"Statements typically contain a command clause and aconditional clause.Commands are applied to rows which match theconditional clause.A null conditional clause matches all rows.

A statement is a series of clauses which are terminated bya ";"

Statements typically contain a command clause and aconditional clause.Commands are applied to rows which match theconditional clause.A null conditional clause matches all rows.

A statement is a series of clauses which are terminated bya ";"Statements typically contain a command clause and aconditional clause.

Commands are applied to rows which match theconditional clause.A null conditional clause matches all rows.

A statement is a series of clauses which are terminated bya ";"Statements typically contain a command clause and aconditional clause.Commands are applied to rows which match theconditional clause.

A null conditional clause matches all rows.

A statement is a series of clauses which are terminated bya ";"Statements typically contain a command clause and aconditional clause.Commands are applied to rows which match theconditional clause.A null conditional clause matches all rows.

CreateReadUpdateDelete

Creation

CREATE DATABASE - Creates a new SchemaCREATE TABLE - Creates a TableINSERT - Creates a row

Creation

CREATE DATABASE - Creates a new Schema

CREATE TABLE - Creates a TableINSERT - Creates a row

Creation

CREATE DATABASE - Creates a new SchemaCREATE TABLE - Creates a Table

INSERT - Creates a row

Creation

CREATE DATABASE - Creates a new SchemaCREATE TABLE - Creates a TableINSERT - Creates a row

SELECT - Selects matching rowsSELECT is the most complex of the statements, it’s wheremost of the work is done!

SELECT - Selects matching rows

SELECT is the most complex of the statements, it’s wheremost of the work is done!

SELECT - Selects matching rowsSELECT is the most complex of the statements, it’s wheremost of the work is done!

Modifying Data

UPDATE - Change values on matching rowsDELETE - Delete matching rows

Modifying Data

UPDATE - Change values on matching rows

DELETE - Delete matching rows

Modifying Data

UPDATE - Change values on matching rowsDELETE - Delete matching rows

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