SQL Introduction: Learn Query, tools and commands

Platforms to lean SQL and copy SQL Dump to create sample student table with records and basics

Once our database and script installation is over then we can learn how to manage Database .
SQL ( Structured Query Language ) is one of the important tool for programmers. Sql is a part of the database management tool. There are many databases available from different vendors. For web applications MSSQL, MySQL, SQLite are mostly used. Oracle is very popular among enterprise users. MySQL community server can be downloaded from mysql.net and it is free.

Combination of PHP ( scripting language ) and MySQL ( database server ) is the most popular in the world today among all web applications.

What is SQL

Sql is a common language to manage all the operations for a database. There are different SQL commands available to manage the database. You need not start reading or take training on all the commands at a time, you can use this site as a referance and read all our free tutorials on SQL.
Scripts and SQL in Database

Now let us start with simple query to create table to store our student records. Then we will use insert query to add few records. Don't worry to understand all the meanings of the Query at this stage. Use this SQL to create the table.

CREATE TABLE student ( id int(2) NOT NULL auto_increment,  name varchar(50) NOT NULL default '', 
class varchar(10) NOT NULL default '', mark int(3) NOT NULL default '0', 
UNIQUE KEY id (id) ) TYPE=MyISAM;

This will create the table for us. We can see that there are three fields in the table. One is id which is an auto increment and will take one unique number each time one record is added to the table. Next field is name of 50 length, this will store the student name. Next is class field of 10 length.

Adding records

Let us fill the tables with some data. Here is the SQL to insert the data to the table. We need not worry at this stage how this SQL works as we will discuss that in other pages. You can just copy and paste this SQL code in your SQL window to insert some records to the tables.

INSERT INTO student VALUES (1, 'John Deo', 'Four', 75);
INSERT INTO student VALUES (2, 'Max Ruin', 'Three', 85);
INSERT INTO student VALUES (3, 'Arnold', 'Three', 55);
INSERT INTO student VALUES (4, 'Krish Star', 'Four', 60);
INSERT INTO student VALUES (5, 'John Mike', 'Four', 60);
INSERT INTO student VALUES (6, 'Alex John', 'Five', 55);

This SQL code will insert six records to the student table. Now our table with data is ready. We will start learning one SQL command now .

Types of SQL commands

DDL - Data Definition Language

CREATE, DROP, ALTER, TRUNCATE , COMMENT , RENAME

DML - Data Manipulation Language

INSERT, UPDATE, DELETE

DQL - Data Query Language

SELECT

DCL - Data Control Language

GRANT , REVOKE

TCL - Transaction Control Language

COMMIT, ROLLBACK, SAVEPOINT, SET TRANSACTION
Installation of Database Tables & records of a Database Managing MySQL SELECT Query

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Randy Orton	05-07-2010
What is diferrence among SQL,MySQL and Oracle. I wanna Know that..!

Neha	23-08-2010
these are different database servers made by different companies.

Wathum Nestore	27-08-2010
I like what this site gives to the public!

Marc	30-05-2012
Need a step by step guide to the selection query and the rest of the most common queries and how to build put them all together

sunil	10-11-2012
i have just one word for this tutorial "awesome".

alvin	15-01-2010
nice tutorials