MySQL Introduction. By Prof. B.A.Khivsara

Transcription

1 MySQL Introduction By Prof. B.A.Khivsara Note: The material to prepare this presentation has been taken from internet and are generated only for students reference and not for commercial use.

2 Introduction to MySQL MySQL is the most popular Open Source Relational SQL Database Management System. MySQL is one of the best RDBMS being used for developing various web-based software applications. MySQL is developed, marketed and supported by MySQL AB, which is a Swedish company.

3 What is a Database? A database is a separate application that stores a collection of data. Each database has one or more distinct APIs for creating, accessing, managing, searching and replicating the data it holds.

4 A Relational DataBase Management System (RDBMS) is a software that Enables you to implement a database with tables, columns and indexes. Guarantees the Referential Integrity between rows of various tables. Updates the indexes automatically. Interprets an SQL query and combines information from various tables.

5 RDBMS Terminology Database A database is a collection of tables, with related data. Table A table is a matrix with data. A table in a database looks like a simple spreadsheet. Column One column (data element) contains data of one and the same kind, for example the column postcode. Row A row (= tuple, entry or record) is a group of related data, for example the data of one subscription. Redundancy Storing data twice, redundantly to make the system faster.

6 RDBMS Terminology Primary Key A primary key is unique. A key value can not occur twice in one table. With a key, you can only find one row. Foreign Key A foreign key is the linking pin between two tables. Compound Key A compound key (composite key) is a key that consists of multiple columns, because one column is not sufficiently unique. Index An index in a database resembles an index at the back of a book. Referential Integrity Referential Integrity makes sure that a foreign key value always points to an existing row.

7 RDBMS Database example Oracle MySQL Ms-Access PostgreSQL Microsoft SQL Server IBM DB2 SQLite Etc.

8 MySQL Database MySQL is an open-source database MySQL is customizable because it is an open source database MySQL is quicker than other databases so it can work well even with the large data set. MySQL supports many languages like PHP, PERL, C, C++, JAVA, etc. MySQL uses a standard form of the well-known SQL data language. MySQL supports large databases, up to 50 million rows or more in a table. The default file size limit for a table is 4GB, but you can increase this (if your operating system can handle it) to a theoretical limit of 8 million terabytes (TB).

9 MySQL Data Types Categaries Numeric Data Type Date and Time Data Type: String Data Types: Large Object Data Types (LOB) Data Types: Data Types INT, FLOAT(m,d), DOUBLE(m,d), DECIMAL(m,d) DATE, DATETIME,TIME, TIMESTAMP,YEAR CHAR,VARCHAR,TEXT, LONGTEXT,BINARY TINYBLOB, BLOB, MEDIUMBLOB, LONGTEXT

10 Command to Install MySQL in ubuntu sudo apt-get install mysql mysql-client mysql-server

11 How to start MySQL First install mysql then write following command on command prompt mysql -u root p Then Enter Password, it will show you MySQL prompt

12 Database related commands- CREATE Syntax to create database CREATE DATABASE database_name; Example: Let's take an example to create a database name "employees" CREATE DATABASE employees;

13 Database related commands- SHOW & USE You can check the created database by the following query: SHOW DATABASES; You can use SQL command USE to select a particular database. Syntax: USE database_name; Example: Let's take an example to use a database name "customers". USE customers;

14 Database related commands- DROP You can drop/delete/remove a MySQL database easily with the MySQL command. You should be careful while deleting any database because you will lose your all the data available in your database. Syntax: DROP DATABASE database_name; Example: Let's take an example to drop a database name "employees" DROP DATABASE employees;

15 How to Connect remote MySQL server To connect remote MySQL server, use the -h (host) with IP Address of remote machine. # mysqladmin -h u root -p

16 Schema Objects in Oracle and MySQL Oracle AFTER trigger BEFORE trigger Check constraint Column default Database Foreign key Index Package PL/SQL function PL/SQL procedure Primary key Role MySQL trigger trigger Check constraint Column default Database Foreign key Index N/A Routine Routine Primary key N/A

17 Schema Objects in Oracle and MySQL Oracle Schema Sequence Snapshot Synonym Table Tablespace Temporary table Trigger for each row Unique key User View MySQL Schema AUTO_INCREMENT for a column N/A N/A Table N/A Temporary table Trigger for each row Unique key User View

18 REFERENCES