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Valores NULOS de SQL o SQL NULL Values

Tiempo de lectura: < 1 minuto

En SQL, un valor nulo es un valor que no tiene un valor específico o válido. En otras palabras, un valor nulo representa la ausencia de un valor en una columna específica. Es importante tener en cuenta que un valor nulo es diferente de un valor cero o una cadena vacía.

Existen varias formas de trabajar con valores nulos en SQL. A continuación se describen algunas de ellas:

  • IS NULL: esta cláusula se utiliza para buscar valores nulos en una columna específica. Por ejemplo, si queremos buscar todos los empleados cuyo salario es nulo, podríamos utilizar la siguiente consulta:
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SELECT *
FROM Empleados
WHERE Salario IS NULL;
SELECT * FROM Empleados WHERE Salario IS NULL;
SELECT * 
FROM Empleados 
WHERE Salario IS NULL;
  • IS NOT NULL: esta cláusula se utiliza para buscar valores que no son nulos en una columna específica. Por ejemplo, si queremos buscar todos los empleados cuyo salario no es nulo, podríamos utilizar la siguiente consulta:
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EnlighterJS 3 Syntax Highlighter
SELECT *
FROM Empleados
WHERE Salario IS NOT NULL;
SELECT * FROM Empleados WHERE Salario IS NOT NULL;
SELECT * 
FROM Empleados 
WHERE Salario IS NOT NULL;

Esto es todo sobre los valores nulos en SQL si necesitas mas información sobre ello. dejalo en los comentarios de la publicación.

Buena tarde a tod@s

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