Free SQL Tutorial - Learn SQL

Learn Sql Language

Learn SQL can be very rewarding. Once you have a basic knowledge of SQL, you can begin to develop more advanced web sites, and can (hopefully) load more money to do it!

This free service covers SQL Tutorial SQL (Structure Query Language) syntax and its various SQL commands. It requires a basic knowledge of databases and design database.

Although not essential, that will most benefit from examples of good practice on your own computer - this would require a database program like MS-SQL, MySQL, SQL Server, Oracle or configured on your computer.

If you do not have a database program installed on your machine, do not despair, you can always know what is SQL and its syntax. So when you find a database, you'll know exactly what to do!

What is SQL?

  • SQL stands for Structured Query Language
  • SQL lets you access and manipulate databases
  • SQL is an ANSI (American National Standards Institute) standard

What Can SQL do?

  • SQL can execute queries against a database
  • SQL can retrieve data from a database
  • SQL can insert records in a database
  • SQL can update records in a database
  • SQL can delete records from a database
  • SQL can create new databases
  • SQL can create new tables in a database
  • SQL can create stored procedures in a database
  • SQL can create views in a database
  • SQL can set permissions on tables, procedures, and views

SQL is a Standard - BUT....

Although SQL is an ANSI (American National Standards Institute) standard, there are many different versions of the SQL language.

However, to be compliant with the ANSI standard, they all support at least the major commands (such as SELECT, UPDATE, DELETE, INSERT, WHERE) in a similar manner.

Note: Most of the SQL database programs also have their own proprietary extensions in addition to the SQL standard!

Using SQL in Your Web Site

To build a web site that shows some data from a database, you will need the following:

  • An RDBMS database program (i.e. MS Access, SQL Server, MySQL)
  • A server-side scripting language, like PHP or ASP
  • SQL
  • HTML / CSS

RDBMS

RDBMS stands for Relational Database Management System.

RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.

The data in RDBMS is stored in database objects called tables.

A table is a collections of related data entries and it consists of columns and rows.

SQL Tutorial © Techashi. 2011