Tutorial sql w3

SQL Tutorial

| SQL es un lenguaje estándar para acceder a bases de datos.
Nuestra SQL tutorial te enseña cómo usar SQL para tener acceso y manipular datos en:
MySQL, SQL Server, Access, Oracle, Sybase, DB2, y otros sistemas de base de datos. |

SQL Syntax SELECT Company, Country FROM Customers WHERE Country 'USA' |
SQL Result Company | Country |
Island Trading  | UK  |
Galeríadel gastrónomo  | Spain  |
Laughing Bacchus Wine Cellars  | Canada  |
Paris spécialités  | France  |
Simons bistro  | Denmark  |
Wolski Zajazd  | Poland  |

Try it yourself » |

Start learning SQL now!
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SQL Demo

Learn by examples! With our editor, you can edit the SQL, and click on a button to view the result.
Try-It-Yourself!-------------------------------------------------
SQL Quiz Test

Test your SQL skills at W3Schools!
Start SQL Quiz!
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SQL Quick Reference

An SQL Quick Reference. Print it and put it in your pocket.
SQL Quick Reference
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SQL Data Types
Data types and ranges for Microsoft Access, MySQL and SQLServer.
SQL Data Types
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Introduction to SQL
SQL es un lenguaje estándar para acceder y manipular bases de datos.

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
* SQLcan 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 viewsSQL 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...