Tag Archives | command

MySQL Command Types MySql Tutorial for Beginners Part 2

Few Days ago we started MySQL for beginners tutorial. That was a quick intro about What is a database, What is Database table , What is SQL and Why do we use SQL? Today we will cover What are the types of MySQL database commands. Some readers asked why we are writing on MySQL Basics? We have readers learning MySQL for school or Job, We are Starting from Scratch on MySQL tutorial for beginners.You can Follow us on twitter to get latest updates on MySQL tutorial for beginners. Here is our Twitter


Types Of SQL Commands / Statements

SQL commands / statements are divided into few categories. Such as Data definition language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), Transaction Control Commands.

1. Data Definition Language (DDL):  This SQL statements are used to define database schema such as the creation or deletion of a table. Here are some examples:

  • CREATE : This statement is used for creating objects in Database.
  • DROP: This statement is used for deleting objects from Database.
  • RENAME : This statement is used for renaming objects from Database.
  • ALTER : This statement is used for altering structure of the Database.
  • TRUNCATE : This statement removes all record from a table.TRUNCATE removes all rows from a table immediately after execution .

2. Data Manipulation Language (DML): This statement are used for manipulating data from objects in a Relational Database system. Here are some Examples bellow:

  • SELECT : SELECT is one of the most Used Command in SQL. To Retrieve from Data from Database we use SELECT statement.
  • INSERT : INSERT statement is used for inserting data into Database.
  • DELETE : This statement is used to remove rows from a table. You need to be extra with this command.After using a DELETE operation you need to COMMIT the transaction to make the change permanent.
  • UPDATE : This statement updates existing data within a table.

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Some Unix Commands And tutorials For Beginners

Couple days ago i was  learning UNIX commands. I found some cool sites that could help some one to learn Unix Easily. …  I tried to add some best site for learning Unix. Enjoy and let me know if you know some cool site like this.
1. From Harvard Mathematics Department :


2. From Unix Tool Box : Here is a cool Cheat sheet for Unix commands from Unix toolbox


3. And One of the Best is Learn Unix In Ten Minutes :


4. And Here is a Unix/ Linus command Reference Cheat sheet from Fosswire.com . Check the link below to download the Unix command cheat sheet as PDF file for your everyday use.


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