Acutec Global Services Interview Questions and Answers

SQL queries are used to retrieve, manipulate, and manage data stored in relational databases.

• SELECT statement is used to retrieve data from a database table

• INSERT statement is used to insert new data into a database table

• UPDATE statement is used to modify existing data in a database table

• DELETE statement is used to delete data from a database table

• JOIN statement is used to combine rows from different tables based on a ...read more

Inheritance is a mechanism in object-oriented programming where a new class is created from an existing class.

• Allows for code reuse and promotes modularity

• Derived class inherits properties and methods from base class

• Can override or add new functionality to inherited methods

• Types of inheritance include single, multiple, multilevel, and hierarchical

• Example: A Car class can inherit properties and methods from a Vehicle cl

An abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract and non-abstract methods.

• Abstract methods have no implementation and must be implemented by the derived class.

• A class can only inherit from one abstract class but can implement multiple interfaces.

• Example: abstract class Animal { abstract void makeSound(); }

• Example: class Dog extend...read more

Java features include platform independence, object-oriented programming, and automatic memory management.

• Platform independence allows Java code to run on any platform with a JVM.

• Object-oriented programming allows for modular and reusable code.

• Automatic memory management frees developers from managing memory allocation and deallocation.

• Other features include exception handling, multithreading, and security.

• Examples of ...read more

A select query is a type of SQL query used to retrieve data from a database.

• It is used to retrieve specific data from one or more tables in a database.

• It uses the SELECT statement followed by the columns to be retrieved.

• It can also include conditions using WHERE clause to filter the data.

• Examples: SELECT * FROM customers; SELECT name, age FROM employees WHERE department='IT';