Web app development_my_sql_08

Jul 15, 20131 like615 views

This document provides an overview of databases and the SQL language. It defines a database as a container for tables and other SQL structures. It describes the main components of a database management system (DBMS) including defining, constructing, manipulating, and sharing databases. It outlines the three sublanguages that make up SQL: data definition language (DDL) to create and modify database structures, data manipulation language (DML) to work with data, and data control language (DCL) for security. Examples are provided of commands to create tables, alter tables, drop tables, and insert, update, and delete data. Data types and an exercise to create sample tables are also included.

hasen@microcis.net July 15, 2013Hassen poreya
Trainer, Cresco Solution
Afghanistan Workforce
Development Program
Database
Database Management System, MySQL

Database
A Database is a container that holds tables and other
SQL structures related to those tables.

Database Management System (DBMS)
 Elmasri & Navathe (2007):
“A database management system (DBMS) is a
collection of programs that enables users to
create and maintain a database.”

Database Management System (DBMS)
 A DBMS fulfills several purposes:
 Defining databases
 Constructing databases
 Manipulating databases
 Sharing databases among various users and
applications

Database Management System (DBMS)
 MS Access
 MySQL (Open Source)
 SQL-Server (Microsoft)
 Oracle
 PostgreSQL
 FoxPro
 SQLite

SQL (Structured Query Language)
 SQL is a database language designed for
 Retrieval and management of data in relational DBMS
 Database schema creation and modification
 It is used also in case of security, Authorization,
Integrity
 2 Originally, SQL was called SEQUEL (Structured
English QUEry Language)
 3 Three languages within a language:
 The Data Definition Language (DDL)
 The Data Manipulation Language (DML)
 The Data Control Language (DCL)

Data Definition Language (DDL)
 The Data Definition Language (DDL) is the part of
SQL.
 You use to create, change, or destroy the basic
elements of a relational database.
 Definition Language (DDL) deals with the structure
of a database.

Data Definition Language (DDL)
 The DDL consists of these three commands:
 CREATE: You use the various forms of this command to
build the essential structures of the database
 ALTER: You use this command to change structures
that You create
 DROP: If you apply this command to a table, it
destroys not only the table's data, but its structure as
well.

Data Manipulation Language (DML)
 The Data Manipulation Language deals with the
data contained within that structure.
 The Data Manipulation Language (DML) is the part
of SQL that operates on the data.
 The DML statements that can be use is:
 INSERT
 UPDATE
 DELETE
 SELECT

Data Control Language (DCL)
 Protects your database from becoming corrupted.
 The DCL provides security for your database
 DCL hast four commands:
 COMMIT
 ROLLBACK
 GRANT
 REVOKE

Data Control Language (DCL)
 Database Name: Company
 Tables: employee, project, works in

Create Command (DDL)
 SHOW databases;
 To list name of available databases.
 CREATE DATABASE name;
 USE name;

Create Command (DDL)
 To create new table:
 CREATE TABLE table_name (column1_name
data_type1, column2_name data_type2…);

Create Command (DDL)
 To create table project:
 To create table works_in:

ALTER TABLE Commands
 Add new column:
 ALTER TABLE employee ADD COLUMN (salary
INTEGER);
 Change data type of a column:
 ALTER TABLE employee MODIFY COLUMN salary
FLOAT;
 Delete column:
 ALTER TABLE employee DROP COLUMN salary;

DROP Commands
 Delete Database:
 DROP DATABASE Company;
 Delete Table:
 DROP TABLE employee;
 Two other useful command:
 SHOW TABLES; -- Show available tables (after selecting
a database with USE)

Commands
 DESCRIBE table name;
 Show structure of table

Data types
 INTEGER : integer
 FLOAT : floating point number
 DATE : a date, format: 'YYYY-MM-DD'
 VARCHAR(N) : variable length string, the length is
indicated by N, range 0-255
 TEXT : text, maximum length of 65,535 characters
 BOOLEAN : 0=false, any other value=true

Exercise
 Create a database “Student”
 Each student has different information including
ID, name, last name, class, phone number.
 Table student.
 Each student also needs a username and password
to enter to the library system.
 Table users
 Do entry at least for five students!

hasen@microcis.net July 15, 2013Hassen poreya
Trainer, Cresco Solution
Any Questions!

SQL is a special-purpose programming language designed to manage data in relational database management systems (RDBMS). It allows users to define, manipulate, and control access to data in databases. SQL statements are divided into two main categories: DDL (Data Definition Language) statements are used to define database objects like tables, while DML (Data Manipulation Language) statements are used to query and manipulate data like SELECT, INSERT, UPDATE, DELETE. SQL was developed in the 1970s by IBM researchers Donald D. Chamberlin and Raymond F. Boyce and was initially called SEQUEL.

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1. [email protected] July 15, 2013Hassen poreya Trainer, Cresco Solution Afghanistan Workforce Development Program Database Database Management System, MySQL

2. Database A Database is a container that holds tables and other SQL structures related to those tables.

3. Database

4. Database Management System (DBMS)  Elmasri & Navathe (2007): “A database management system (DBMS) is a collection of programs that enables users to create and maintain a database.”

5. Database Management System (DBMS)  A DBMS fulfills several purposes:  Defining databases  Constructing databases  Manipulating databases  Sharing databases among various users and applications

6. Database Management System (DBMS)  MS Access  MySQL (Open Source)  SQL-Server (Microsoft)  Oracle  PostgreSQL  FoxPro  SQLite

7. SQL (Structured Query Language)  SQL is a database language designed for  Retrieval and management of data in relational DBMS  Database schema creation and modification  It is used also in case of security, Authorization, Integrity  2 Originally, SQL was called SEQUEL (Structured English QUEry Language)  3 Three languages within a language:  The Data Definition Language (DDL)  The Data Manipulation Language (DML)  The Data Control Language (DCL)

8. Data Definition Language (DDL)  The Data Definition Language (DDL) is the part of SQL.  You use to create, change, or destroy the basic elements of a relational database.  Definition Language (DDL) deals with the structure of a database.

9. Data Definition Language (DDL)  The DDL consists of these three commands:  CREATE: You use the various forms of this command to build the essential structures of the database  ALTER: You use this command to change structures that You create  DROP: If you apply this command to a table, it destroys not only the table's data, but its structure as well.

10. Data Manipulation Language (DML)  The Data Manipulation Language deals with the data contained within that structure.  The Data Manipulation Language (DML) is the part of SQL that operates on the data.  The DML statements that can be use is:  INSERT  UPDATE  DELETE  SELECT

11. Data Control Language (DCL)  Protects your database from becoming corrupted.  The DCL provides security for your database  DCL hast four commands:  COMMIT  ROLLBACK  GRANT  REVOKE

12. Data Control Language (DCL)  Database Name: Company  Tables: employee, project, works in

13. Create Command (DDL)  SHOW databases;  To list name of available databases.  CREATE DATABASE name;  USE name;

14. Create Command (DDL)  To create new table:  CREATE TABLE table_name (column1_name data_type1, column2_name data_type2…);

15. Create Command (DDL)  To create table project:  To create table works_in:

16. ALTER TABLE Commands  Add new column:  ALTER TABLE employee ADD COLUMN (salary INTEGER);  Change data type of a column:  ALTER TABLE employee MODIFY COLUMN salary FLOAT;  Delete column:  ALTER TABLE employee DROP COLUMN salary;

17. DROP Commands  Delete Database:  DROP DATABASE Company;  Delete Table:  DROP TABLE employee;  Two other useful command:  SHOW TABLES; -- Show available tables (after selecting a database with USE)

18. Commands  DESCRIBE table name;  Show structure of table

19. Data types  INTEGER : integer  FLOAT : floating point number  DATE : a date, format: 'YYYY-MM-DD'  VARCHAR(N) : variable length string, the length is indicated by N, range 0-255  TEXT : text, maximum length of 65,535 characters  BOOLEAN : 0=false, any other value=true

20. Exercise  Create a database “Student”  Each student has different information including ID, name, last name, class, phone number.  Table student.  Each student also needs a username and password to enter to the library system.  Table users  Do entry at least for five students!

21. [email protected] July 15, 2013Hassen poreya Trainer, Cresco Solution Any Questions!

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