Contenido del Curso
Introducción a SQL
Introducción a SQL
Recuperación de Columnas Individuales
¿Qué es SQL?
SQL es un lenguaje de programación para la interacción del usuario con bases de datos, utilizado para consultar, actualizar y gestionar bases de datos.
Base de datos
Una base de datos es una estructura organizada diseñada para almacenar, modificar y procesar grandes cantidades de datos.
Database
Why SQL Matters
SQL is essential for managing and querying databases efficiently. It is widely used due to its standardization, scalability, and ability to ensure data integrity. SQL's integration with other technologies makes it a versatile tool in various applications, supporting real-time data processing and decision-making.
En nuestra consulta anterior, utilizamos SELECT
para recuperar una única columna de continente de la tabla de países.
Es importante notar que debe especificar el nombre de la columna inmediatamente después de la palabra clave SELECT
, y la palabra clave FROM
especifica el nombre de la tabla de la cual deseamos recuperar datos.
SQL Syntax Explanation
To retrieve data from a database, SQL uses the SELECT
statement. Here's the basic syntax:
- SELECT: Specifies the columns to retrieve;
- FROM: Specifies the table from which to retrieve the data.
For example, to get the continent
column from the country
table, the syntax is:
This query will return all entries in the continent
column from the country
table.
SELECT continent FROM country;
In our previous query, we utilized the SELECT
to retrieve a single continent column from the country table.
It's important to note that you must specify the column name immediately after the SELECT
keyword, and the FROM
keyword specifies the name of the table from which we wish to retrieve data.
Swipe to show code editor
Write an SQL query to retrieve a capital
column from the country
table.
Once you've completed this task, click the button below the code to check your solution.
¡Gracias por tus comentarios!
Recuperación de Columnas Individuales
¿Qué es SQL?
SQL es un lenguaje de programación para la interacción del usuario con bases de datos, utilizado para consultar, actualizar y gestionar bases de datos.
Base de datos
Una base de datos es una estructura organizada diseñada para almacenar, modificar y procesar grandes cantidades de datos.
Database
Why SQL Matters
SQL is essential for managing and querying databases efficiently. It is widely used due to its standardization, scalability, and ability to ensure data integrity. SQL's integration with other technologies makes it a versatile tool in various applications, supporting real-time data processing and decision-making.
En nuestra consulta anterior, utilizamos SELECT
para recuperar una única columna de continente de la tabla de países.
Es importante notar que debe especificar el nombre de la columna inmediatamente después de la palabra clave SELECT
, y la palabra clave FROM
especifica el nombre de la tabla de la cual deseamos recuperar datos.
SQL Syntax Explanation
To retrieve data from a database, SQL uses the SELECT
statement. Here's the basic syntax:
- SELECT: Specifies the columns to retrieve;
- FROM: Specifies the table from which to retrieve the data.
For example, to get the continent
column from the country
table, the syntax is:
This query will return all entries in the continent
column from the country
table.
SELECT continent FROM country;
In our previous query, we utilized the SELECT
to retrieve a single continent column from the country table.
It's important to note that you must specify the column name immediately after the SELECT
keyword, and the FROM
keyword specifies the name of the table from which we wish to retrieve data.
Swipe to show code editor
Write an SQL query to retrieve a capital
column from the country
table.
Once you've completed this task, click the button below the code to check your solution.
¡Gracias por tus comentarios!