DBMS Interview Questions 2022 | MySQL Interview Questions 2022 | DBMS Most Asked Interview Questions

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DBMS Interview Questions 2022 | MySQL Interview Questions 2022 | DBMS Most Asked Interview Questions

Ques: What is a database?

Ans: A information may be a logically coherent assortment of information with some inherent that means, representing some facet of the globe and that is meant, designed, and inhabited with information for a selected purpose.

Ques: What is DBMS?

Ans: It is a set of programs that permits users to form and maintain info. In alternative words it’s general computer code that has the users with the processes of shaping, constructing, and manipulating the info for numerous applications.

Ques: What is a Database system?

Ans: The database and DBMS software together is called a Database system.

Ques: What are the advantages of DBMS?

Ans:

  1. Redundancy is
  2. Unauthorized access is
  3. Providing multiple user
  4. Enforcing integrity
  5. Providing backup and

Ques: What are the disadvantages of a File Processing System?

Ans:

  • Data redundancy and
  • Difficult in accessing
  • Data  Data integrity.
  • Concurrent access is not
  • Security

Ques: Describe the three levels of data abstraction?

Ans: There are three levels of abstraction:

  1. Physical level: The lowest level of abstraction describes how data are
  2. Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
  3. View level: The highest level of abstraction describes only part of entire

Ques: Define the “integrity rules”?

Ans: There are two Integrity rules.

  1. Entity Integrity: States that “Primary key cannot have NULL value”
  2. Referential Integrity: States that “Foreign Key can be either a NULL value or should be Primary Key value of other relation.

Ques: What are extension and intention?

Ans:

  1. Extension: It is the number of tuples present in a table at any This is time dependent.
  2. Intension: It is a constant value that gives the name, structure of table and the constraints laid on

Ques: What is System R? What are its two major subsystems?

Ans: System R was designed and developed over the period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to demonstrate that it is possible to build a Relational System that can be used in a real-life environment to solve real-life problems, with a performance at least comparable to that of the existing system.

Its two subsystems are:

  • Research Storage
  • System Relational Data

Ques: How is the data structure of System R different from the relational structure?

Ans: Unlike Relational systems in System R:

  1. Domains are not supported
  2. Enforcement of candidate key uniqueness is optional
  3. Enforcement of entity integrity is optional
  4. Referential integrity is not enforced

Ques: What is Join?

Ans: An SQL Join is used to combine data from two or more tables, based on a common field between them. For example, consider the following two tables.

Student Table

ENROLLNOSTUDENTNAMEADDRESS
1000geek1geeksquiz1
1001geek2geeksquiz2
1002geek3geeksquiz3

Student Course Table

COURSEIDENROLLNO
11000
21000
31000
11002
21003

Following is a join query that shows the names of students enrolled in different courseIDs.

SELECT StudentCourse.CourseID, Student.StudentName FROM StudentCourse INNER JOIN Customers ON StudentCourse.EnrollNo = Student.EnrollNo ORDER BY StudentCourse.CourseID;

The above query would produce the following result.

COURSEIDSTUDENTNAME
1geek1
1geek2
2geek1
2geek3
3geek1

Ques: What is a view in SQL? How to create one

Ans: A view is a virtual table based on the result-set of an SQL statement. We can create using create view syntax.

CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition;

Ques. There is a table where only one row is fully repeated. Write a Query to find the repeated row

NameSection
abcCS1
bcdCS2
abcCS1

In the above table, we can find duplicate rows using the below query.

SELECT name, section FROM tbl GROUP BY name, section HAVING COUNT(*) > 1

Ques. What is the Query to find the 2nd highest salary of an employee?

Ans:

SELECT max(salary) FROM EMPLOYEES WHERE salary IN (SELECT salary FROM EMPLOYEEs MINUS SELECT max(salary) FROM EMPLOYEES);

OR

SELECT max(salary) FROM EMPLOYEES WHERE salary <> (SELECT max(salary) FROM EMPLOYEES);

Ques. Get employee details from employee table whose first name ends with ‘n’ and name contains 4 letters

Select * from EMPLOYEE where FIRST_NAME like '___n'; #(Underscores)

Ques. Get employee details from employee table whose first name starts with ‘J’ and name contains 4 letters

Select * from EMPLOYEE where FIRST_NAME like 'J___'; #(Underscores)

Ques. Get employee details from employee table whose Salary greater than 600000

Select * from EMPLOYEE where Salary >600000;

Ques. Get employee details from employee table whose Salary less than 800000

Select * from EMPLOYEE where Salary <  #800000

Ques. Get employee details from employee table whose Salary between 500000 and 800000.

Select * from EMPLOYEE where Salary between 500000 and 800000;

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  794. analisis de vibraciones
    Equipos de equilibrado: esencial para el operacion fluido y optimo de las dispositivos.

    En el mundo de la innovacion actual, donde la eficiencia y la estabilidad del equipo son de maxima relevancia, los aparatos de ajuste juegan un papel esencial. Estos equipos especializados estan concebidos para balancear y asegurar piezas moviles, ya sea en dispositivos productiva, automoviles de traslado o incluso en aparatos caseros.

    Para los profesionales en mantenimiento de aparatos y los especialistas, trabajar con sistemas de balanceo es importante para garantizar el funcionamiento estable y seguro de cualquier sistema dinamico. Gracias a estas opciones innovadoras avanzadas, es posible reducir notablemente las sacudidas, el zumbido y la presion sobre los rodamientos, mejorando la longevidad de elementos caros.

    Igualmente trascendental es el rol que cumplen los sistemas de calibracion en la servicio al comprador. El asistencia tecnico y el reparacion permanente empleando estos equipos habilitan dar asistencias de gran calidad, aumentando la bienestar de los clientes.

    Para los propietarios de proyectos, la contribucion en equipos de calibracion y sensores puede ser clave para optimizar la eficiencia y eficiencia de sus equipos. Esto es sobre todo importante para los emprendedores que manejan reducidas y pequenas empresas, donde cada punto importa.

    Ademas, los equipos de balanceo tienen una amplia implementacion en el campo de la fiabilidad y el supervision de calidad. Facilitan localizar potenciales defectos, impidiendo reparaciones costosas y perjuicios a los dispositivos. Ademas, los datos obtenidos de estos sistemas pueden utilizarse para perfeccionar sistemas y aumentar la presencia en buscadores de consulta.

    Las sectores de utilizacion de los equipos de balanceo comprenden numerosas sectores, desde la fabricacion de ciclos hasta el monitoreo del medio ambiente. No interesa si se refiere de extensas producciones productivas o modestos locales caseros, los equipos de ajuste son fundamentales para asegurar un rendimiento optimo y sin presencia de detenciones.

    Reply

  810. Профессиональный сервисный центр по ремонту техники в Новосибирске.
    Мы предлагаем: Сколько стоит ремонт квадрокоптеров global drone
    Наши мастера оперативно устранят неисправности вашего устройства в сервисе или с выездом на дом!

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  811. La Nivelación de Partes Móviles: Esencial para una Operación Sin Vibraciones

    ¿ Has percibido alguna vez temblores inusuales en un equipo industrial? ¿O sonidos fuera de lo común? Muchas veces, el problema está en algo tan básico como una falta de simetría en un elemento móvil. Y créeme, ignorarlo puede costarte bastante dinero .

    El equilibrado de piezas es una tarea fundamental tanto en la fabricación como en el mantenimiento de maquinaria agrícola, ejes, volantes, rotores y componentes de motores eléctricos . Su objetivo es claro: evitar vibraciones innecesarias que pueden causar daños serios a largo plazo .

    ¿Por qué es tan importante equilibrar las piezas?
    Imagina que tu coche tiene un neumático con peso desigual. Al acelerar, empiezan los temblores, el manubrio se mueve y hasta puede aparecer cierta molestia al manejar . En maquinaria industrial ocurre algo similar, pero con consecuencias aún peores :

    Aumento del desgaste en bearings y ejes giratorios
    Sobrecalentamiento de componentes
    Riesgo de fallos mecánicos repentinos
    Paradas sin programar seguidas de gastos elevados
    En resumen: si no se corrige a tiempo, una mínima falla podría derivar en una situación compleja.

    Métodos de equilibrado: cuál elegir
    No todos los casos son iguales. Dependiendo del tipo de pieza y su uso, se aplican distintas técnicas:

    Equilibrado dinámico
    Ideal para piezas que giran a alta velocidad, como rotores o ejes . Se realiza en máquinas especializadas que detectan el desequilibrio en varios niveles simultáneos. Es el método más preciso para garantizar un funcionamiento suave .
    Equilibrado estático
    Se usa principalmente en piezas como neumáticos, discos o volantes de inercia. Aquí solo se corrige el peso excesivo en una sola superficie . Es ágil, práctico y efectivo para determinados sistemas.
    Corrección del desequilibrio: cómo se hace
    Taladrado selectivo: se quita peso en el punto sobrecargado
    Colocación de contrapesos: como en ruedas o anillos de volantes
    Ajuste de masas: típico en bielas y elementos estratégicos
    Equipos profesionales para detectar y corregir vibraciones
    Para hacer un diagnóstico certero, necesitas herramientas precisas. Hoy en día hay opciones disponibles y altamente productivas, por ejemplo :

    ✅ Balanset-1A — Tu asistente móvil para analizar y corregir oscilaciones

    Reply

  812. La Nivelación de Partes Móviles: Esencial para una Operación Sin Vibraciones

    ¿ En algún momento te has dado cuenta de movimientos irregulares en una máquina? ¿O tal vez escuchaste ruidos anómalos? Muchas veces, el problema está en algo tan básico como una falta de simetría en un elemento móvil. Y créeme, ignorarlo puede costarte caro .

    El equilibrado de piezas es un paso esencial en la construcción y conservación de maquinaria agrícola, ejes, volantes y elementos de motores eléctricos. Su objetivo es claro: evitar vibraciones innecesarias que pueden causar daños serios a largo plazo .

    ¿Por qué es tan importante equilibrar las piezas?
    Imagina que tu coche tiene un neumático con peso desigual. Al acelerar, empiezan los temblores, el manubrio se mueve y hasta puede aparecer cierta molestia al manejar . En maquinaria industrial ocurre algo similar, pero con consecuencias considerablemente más serias:

    Aumento del desgaste en soportes y baleros
    Sobrecalentamiento de elementos sensibles
    Riesgo de averías súbitas
    Paradas imprevistas que exigen arreglos costosos
    En resumen: si no se corrige a tiempo, una mínima falla podría derivar en una situación compleja.

    Métodos de equilibrado: cuál elegir
    No todos los casos son iguales. Dependiendo del tipo de pieza y su uso, se aplican distintas técnicas:

    Equilibrado dinámico
    Ideal para piezas que giran a alta velocidad, como rotores o ejes . Se realiza en máquinas especializadas que detectan el desequilibrio en múltiples superficies . Es el método más fiable para lograr un desempeño estable.
    Equilibrado estático
    Se usa principalmente en piezas como llantas, platos o poleas . Aquí solo se corrige el peso excesivo en una única dirección. Es rápido, sencillo y eficaz para ciertos tipos de maquinaria .
    Corrección del desequilibrio: cómo se hace
    Taladrado selectivo: se perfora la región con exceso de masa
    Colocación de contrapesos: tal como en neumáticos o perfiles de poleas
    Ajuste de masas: habitual en ejes de motor y partes relevantes
    Equipos profesionales para detectar y corregir vibraciones
    Para hacer un diagnóstico certero, necesitas herramientas precisas. Hoy en día hay opciones económicas pero potentes, tales como:

    ✅ Balanset-1A — Tu aliado portátil para equilibrar y analizar vibraciones

    Reply

  813. Equilibrar rápidamente
    Solución rápida de equilibrio:
    Soluciones rápidas sin desmontar máquinas

    Imagina esto: tu rotor inicia con movimientos anormales, y cada minuto de inactividad genera pérdidas. ¿Desmontar la máquina y esperar días por un taller? Ni pensarlo. Con un equipo de equilibrado portátil, resuelves sobre el terreno en horas, preservando su ubicación.

    ¿Por qué un equilibrador móvil es como un “paquete esencial” para máquinas rotativas?
    Compacto, adaptable y potente, este dispositivo es la herramienta que todo técnico debería tener a mano. Con un poco de práctica, puedes:
    ✅ Corregir vibraciones antes de que dañen otros componentes.
    ✅ Reducir interrupciones no planificadas.
    ✅ Trabajar en lugares remotos, desde plataformas petroleras hasta plantas eólicas.

    ¿Cuándo es ideal el equilibrado rápido?
    Siempre que puedas:
    – Contar con visibilidad al sistema giratorio.
    – Colocar sensores sin interferencias.
    – Realizar ajustes de balance mediante cambios de carga.

    Casos típicos donde conviene usarlo:
    La máquina muestra movimientos irregulares o ruidos atípicos.
    No hay tiempo para desmontajes (operación prioritaria).
    El equipo es de alto valor o esencial en la línea de producción.
    Trabajas en campo abierto o lugares sin talleres cercanos.

    Ventajas clave vs. llamar a un técnico
    | Equipo portátil | Servicio externo |
    |—————-|——————|
    | ✔ Rápida intervención (sin demoras) | ❌ Demoras por agenda y logística |
    | ✔ Mantenimiento proactivo (previenes daños serios) | ❌ Solo se recurre ante fallos graves |
    | ✔ Reducción de costos operativos con uso continuo | ❌ Costos recurrentes por servicios |

    ¿Qué máquinas se pueden equilibrar?
    Cualquier sistema rotativo, como:
    – Turbinas de vapor/gas
    – Motores industriales
    – Ventiladores de alta potencia
    – Molinos y trituradoras
    – Hélices navales
    – Bombas centrífugas

    Requisito clave: espacio para instalar sensores y realizar ajustes.

    Tecnología que simplifica el proceso
    Los equipos modernos incluyen:
    Software fácil de usar (con instrucciones visuales y automatizadas).
    Diagnóstico instantáneo (visualización precisa de datos).
    Batería de larga duración (perfecto para zonas remotas).

    Ejemplo práctico:
    Un molino en una mina comenzó a vibrar peligrosamente. Con un equipo portátil, el técnico detectó un desbalance en 20 minutos. Lo corrigió añadiendo contrapesos y evitó una parada de 3 días.

    ¿Por qué esta versión es más efectiva?
    – Estructura más dinámica: Listas, tablas y negritas mejoran la legibilidad.
    – Enfoque práctico: Ofrece aplicaciones tangibles del método.
    – Lenguaje persuasivo: Frases como “herramienta estratégica” o “minimizas riesgos importantes” refuerzan el valor del servicio.
    – Detalles técnicos útiles: Se especifican requisitos y tecnologías modernas.

    ¿Necesitas ajustar el tono (más técnico) o añadir keywords específicas? ¡Aquí estoy para ayudarte! ️

    Reply

  814. Предлагаем услуги профессиональных инженеров офицальной мастерской.
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  815. Equilibrio in situ
    El Equilibrado de Piezas: Clave para un Funcionamiento Eficiente

    ¿Alguna vez has notado vibraciones extrañas en una máquina? ¿O tal vez ruidos que no deberían estar ahí? Muchas veces, el problema está en algo tan básico como una irregularidad en un componente giratorio . Y créeme, ignorarlo puede costarte más de lo que imaginas.

    El equilibrado de piezas es un procedimiento clave en la producción y cuidado de equipos industriales como ejes, volantes, rotores y partes de motores eléctricos . Su objetivo es claro: prevenir movimientos indeseados capaces de generar averías importantes con el tiempo .

    ¿Por qué es tan importante equilibrar las piezas?
    Imagina que tu coche tiene un neumático con peso desigual. Al acelerar, empiezan los temblores, el manubrio se mueve y hasta puede aparecer cierta molestia al manejar . En maquinaria industrial ocurre algo similar, pero con consecuencias mucho más graves :

    Aumento del desgaste en soportes y baleros
    Sobrecalentamiento de partes críticas
    Riesgo de fallos mecánicos repentinos
    Paradas sin programar seguidas de gastos elevados
    En resumen: si no se corrige a tiempo, una mínima falla podría derivar en una situación compleja.

    Métodos de equilibrado: cuál elegir
    No todos los casos son iguales. Dependiendo del tipo de pieza y su uso, se aplican distintas técnicas:

    Equilibrado dinámico
    Recomendado para componentes que rotan rápidamente, por ejemplo rotores o ejes. Se realiza en máquinas especializadas que detectan el desequilibrio en dos o más planos . Es el método más exacto para asegurar un movimiento uniforme .
    Equilibrado estático
    Se usa principalmente en piezas como llantas, platos o poleas . Aquí solo se corrige el peso excesivo en una única dirección. Es ágil, práctico y efectivo para determinados sistemas.
    Corrección del desequilibrio: cómo se hace
    Taladrado selectivo: se quita peso en el punto sobrecargado
    Colocación de contrapesos: tal como en neumáticos o perfiles de poleas
    Ajuste de masas: habitual en ejes de motor y partes relevantes
    Equipos profesionales para detectar y corregir vibraciones
    Para hacer un diagnóstico certero, necesitas herramientas precisas. Hoy en día hay opciones accesibles y muy efectivas, como :

    ✅ Balanset-1A — Tu compañero compacto para medir y ajustar vibraciones

    Reply

  816. Equilibrado dinámico portátil:
    Soluciones rápidas sin desmontar máquinas

    Imagina esto: tu rotor inicia con movimientos anormales, y cada minuto de inactividad cuesta dinero. ¿Desmontar la máquina y esperar días por un taller? Olvídalo. Con un equipo de equilibrado portátil, corriges directamente en el lugar en horas, preservando su ubicación.

    ¿Por qué un equilibrador móvil es como un “kit de supervivencia” para máquinas rotativas?
    Fácil de transportar y altamente funcional, este dispositivo es una pieza clave en el arsenal del ingeniero. Con un poco de práctica, puedes:
    ✅ Evitar fallos secundarios por vibraciones excesivas.
    ✅ Reducir interrupciones no planificadas.
    ✅ Actuar incluso en sitios de difícil acceso.

    ¿Cuándo es ideal el equilibrado rápido?
    Siempre que puedas:
    – Acceder al rotor (eje, ventilador, turbina, etc.).
    – Colocar sensores sin interferencias.
    – Ajustar el peso (añadiendo o removiendo masa).

    Casos típicos donde conviene usarlo:
    La máquina muestra movimientos irregulares o ruidos atípicos.
    No hay tiempo para desmontajes (producción crítica).
    El equipo es costoso o difícil de detener.
    Trabajas en áreas donde no hay asistencia mecánica disponible.

    Ventajas clave vs. llamar a un técnico
    | Equipo portátil | Servicio externo |
    |—————-|——————|
    | ✔ Rápida intervención (sin demoras) | ❌ Demoras por agenda y logística |
    | ✔ Mantenimiento proactivo (previenes daños serios) | ❌ Solo se recurre ante fallos graves |
    | ✔ Ahorro a largo plazo (menos desgaste y reparaciones) | ❌ Gastos periódicos por externalización |

    ¿Qué máquinas se pueden equilibrar?
    Cualquier sistema rotativo, como:
    – Turbinas de vapor/gas
    – Motores industriales
    – Ventiladores de alta potencia
    – Molinos y trituradoras
    – Hélices navales
    – Bombas centrífugas

    Requisito clave: acceso suficiente para medir y corregir el balance.

    Tecnología que simplifica el proceso
    Los equipos modernos incluyen:
    Apps intuitivas (guían paso a paso, sin cálculos manuales).
    Diagnóstico instantáneo (visualización precisa de datos).
    Batería de larga duración (perfecto para zonas remotas).

    Ejemplo práctico:
    Un molino en una mina mostró movimientos inusuales. Con un equipo portátil, el técnico localizó el error rápidamente. Lo corrigió añadiendo contrapesos y ahorró jornadas de inactividad.

    ¿Por qué esta versión es más efectiva?
    – Estructura más dinámica: Organización visual facilita la comprensión.
    – Enfoque práctico: Se añaden ejemplos reales y comparaciones concretas.
    – Lenguaje persuasivo: Frases como “recurso vital” o “evitas fallas mayores” refuerzan el valor del servicio.
    – Detalles técnicos útiles: Se especifican requisitos y tecnologías modernas.

    ¿Necesitas ajustar el tono (más instructivo) o añadir keywords específicas? ¡Aquí estoy para ayudarte! ️

    Reply

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