Azentio Senior Plsql Developer Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DBMS.

Q1. What is data integrity?
Ans. 
Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle.
• Data integrity ensures that data is accurate and consistent in storage and transmission.

• It involves maintaining the quality and reliability of data over time.

• Methods for ensuring data integrity include checksums, encryption, and error detection codes.

• Examples of data integrity violations include data corruption, unautho
Answered by AI
Add your answer
Q2. What is a trigger in the context of a database management system?
Ans. 
A trigger is a special type of stored procedure that automatically executes when certain events occur in a database.
• Triggers are used to enforce business rules, maintain data integrity, and automate repetitive tasks.

• They can be triggered by INSERT, UPDATE, or DELETE operations on a table.

• Examples of triggers include auditing changes to a table, updating related tables when a record is modified, or enforcing referential
Answered by AI
Add your answer
Q3. What is the difference between clustered and non-clustered indexes in a database management system?
Ans. 
Clustered indexes physically order the data in the table, while non-clustered indexes do not.
• Clustered indexes determine the physical order of data in the table, while non-clustered indexes do not.

• A table can have only one clustered index, but multiple non-clustered indexes.

• Clustered indexes are faster for retrieval of data, especially range queries, compared to non-clustered indexes.

• Non-clustered indexes are stored se...read more
Answered by AI
Add your answer

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions on DBMS.

Q1. What is the difference between UNION and UNION ALL in SQL?
Ans. 
UNION combines and removes duplicates, UNION ALL combines without removing duplicates.
• UNION merges the result sets of two or more SELECT statements and removes duplicates.

• UNION ALL merges the result sets of two or more SELECT statements without removing duplicates.

• UNION is slower than UNION ALL as it involves removing duplicates.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column...read more
Answered by AI
Add your answer
Q2. What are the functions of a cursor in PL/SQL?
Ans. 
A cursor in PL/SQL is used to retrieve and process multiple rows of data one at a time.
• Allows iteration over a result set

• Retrieves data row by row

• Can be used to update or delete rows in a table

• Must be declared, opened, fetched, and closed
Answered by AI
Add your answer
Q3. Write a SQL query to fetch the nth highest salary from a table.
Ans. 
SQL query to fetch the nth highest salary from a table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to fetch the nth highest salary
Answered by AI
Add your answer

Round duration - 30 minutes
Round difficulty - Easy

This was a managerial round with typical behavioral problems.

Math and verbal round .

General topics to speak

Q1. Duplicates in array College Projects Hashmap implementation
Ans. 
Implement a function to find duplicates in an array of strings using Hashmap.
• Create a Hashmap to store the frequency of each string in the array

• Iterate through the array and check if the frequency of any string is greater than 1

• If yes, add it to the list of duplicates

• Return the list of duplicates
Answered by AI
Add your answer

Round duration - 45 minutes
Round difficulty - Medium

Technical Interview round with questions on Core Subjects mainly.

Q1. What is the difference between C and C++?
Ans. 
C is a procedural programming language while C++ is an object-oriented programming language with features like classes and inheritance.
• C is a procedural programming language, while C++ is a multi-paradigm language with support for object-oriented programming.

• C does not support classes and objects, while C++ does.

• C uses structures for data organization, while C++ uses classes for data organization.

• C does not have featur...read more
Answered by AI
Add your answer
Q2. What is a virtual function?
Ans. 
A virtual function is a function in a base class that is declared using the keyword 'virtual' and can be overridden by a function with the same signature in a derived class.
• Virtual functions allow for dynamic polymorphism in object-oriented programming.

• They are used to achieve runtime binding and enable the implementation of the function to be determined during runtime.

• Example: virtual void display() = 0; in a base cla...read more
Answered by AI
Add your answer
Q3. What is inheritance in object-oriented programming?
Ans. 
Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows for code reusability by creating a new class based on an existing class

• Child class inherits attributes and methods of the parent class

• Can have multiple levels of inheritance (e.g. grandparent, parent, child classes)

• Example: class Dog extends Animal, where Dog inherits properties and methods
Answered by AI
Add your answer
Q4. What is the difference between a Default Constructor and a Copy Constructor in Object-Oriented Programming?
Ans. 
Default Constructor is a constructor that is automatically called when an object is created without any arguments. Copy Constructor is used to create a new object as a copy of an existing object.
• Default Constructor has no parameters, while Copy Constructor takes an object of the same class as a parameter.

• Default Constructor initializes the object with default values, while Copy Constructor creates a new object with the...read more
Answered by AI
Add your answer

Round duration - 40 minutes
Round difficulty - Easy

Technical Interview round with questions on Core Subjects mainly.

Q1. What are the types of access modifiers in C++?
Ans. 
The types of access modifiers in C++ are public, private, and protected.
• Public: accessible from outside the class

• Private: only accessible within the class

• Protected: accessible within the class and its subclasses
Answered by AI
Add your answer
Q2. What is the difference between DDL (Data Definition Language) and DML (Data Manipulation Language)?
Ans. 
DDL is used to define the structure of database objects, while DML is used to manipulate data within those objects.
• DDL is used to create, modify, and delete database objects like tables, indexes, etc.

• DML is used to insert, update, delete, and retrieve data from database tables.

• DDL statements include CREATE, ALTER, DROP, TRUNCATE, etc.

• DML statements include INSERT, UPDATE, DELETE, SELECT, etc.
Answered by AI
Add your answer
Q3. What are the key differences between a Primary Key and a Unique Key in a database management system?
Ans. 
Primary Key uniquely identifies each record in a table, while Unique Key ensures that all values in a column are distinct.
• Primary Key does not allow NULL values, while Unique Key allows one NULL value.

• A table can have only one Primary Key, but multiple Unique Keys.

• Primary Key is automatically indexed, while Unique Key may or may not be indexed.

• Primary Key is used to establish relationships between tables, while Unique ...read more
Answered by AI
Add your answer
Q4. What is the difference between DBMS and RDBMS?
Ans. 
DBMS is a software system that manages databases, while RDBMS is a type of DBMS that stores data in a structured format using tables.
• DBMS stands for Database Management System, which is a software system that allows users to interact with a database.

• RDBMS stands for Relational Database Management System, which is a type of DBMS that stores data in a structured format using tables with rows and columns.

• RDBMS uses Struct...read more
Answered by AI
Add your answer
Q5. What are the objectives of normalization in database management systems?
Ans. 
Normalization in database management systems aims to reduce data redundancy, improve data integrity, and optimize database performance.
• Eliminate data redundancy by breaking down data into smaller tables

• Reduce update anomalies by ensuring data is stored in a logical and consistent manner

• Improve data integrity by enforcing referential integrity constraints

• Optimize database performance by reducing the amount of redundant
Answered by AI
Add your answer

Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Round duration - 60 minutes
Round difficulty - Medium

The interviewer was really cool. He realized that I mostly work on java applications so he chose to ask me stuff related to that. He didn't want me to know the answer well but just wanted me to approach to it, maybe think more. He went through my resume back and forth and asked mostly about all my projects and their logic and how could I take them to the next level.
Tips: Be confident. Its okay not to know any answer, just try giving it a shot in the approach.

Q1. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods with implementation.

• Interface can only have abstract methods and constants.

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

• Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with m
Answered by AI
Add your answer
Q2. What is the difference between 'final', 'finally', and 'finalize' in Java?
Ans. 
final is a keyword used to declare constants, finally is a block used in exception handling, and finalize is a method used for cleanup.
• final is a keyword used to declare constants in Java, meaning the value cannot be changed once assigned. Example: final int x = 10;

• finally is a block used in exception handling to ensure a piece of code is always executed, whether an exception is thrown or not. Example: try { // code } ...read more
Answered by AI
Add your answer
Q3. What is the difference between the private and final access modifiers in Java?
Ans. 
Private restricts access to the class itself, while final prevents inheritance and method overriding.
• Private access modifier restricts access to the class itself, while final access modifier prevents inheritance and method overriding.

• Private members are only accessible within the same class, while final classes cannot be extended and final methods cannot be overridden.

• Example: private int num; - num can only be accesse...read more
Answered by AI
Add your answer
Q4. What are the steps for establishing a JDBC connection?
Ans. 
Establishing a JDBC connection involves loading the driver, creating a connection, creating a statement, executing queries, and handling exceptions.
• Load the JDBC driver using Class.forName() method

• Create a connection using DriverManager.getConnection() method

• Create a statement using connection.createStatement() method

• Execute queries using statement.executeQuery() method

• Handle exceptions using try-catch blocks
Answered by AI
Add your answer
Q5. What is JSON?
Ans. 
JSON is a lightweight data interchange format used to store and transmit data between a server and a web application.
• JSON stands for JavaScript Object Notation.

• It is easy for humans to read and write, and easy for machines to parse and generate.

• JSON is language-independent and can be used with any programming language.

• Example: {"name": "John", "age": 30}

• Example: [{"name": "Alice", "age": 25}, {"name": "Bob", "age": 35}
Answered by AI
Add your answer
Q6. What do you know about garbage collection in Java?
Ans. 
Garbage collection in Java is the process of automatically managing memory by deallocating objects that are no longer needed.
• Garbage collection helps in preventing memory leaks by reclaiming memory used by objects that are no longer referenced.

• Java uses a garbage collector to automatically manage memory, unlike languages like C++ where memory management is manual.

• Garbage collection in Java can be triggered by calling S...read more
Answered by AI
Add your answer

Round duration - 30 minutes
Round difficulty - Easy

I wouldn't say it went great but it was fine. I did not think I would clear it as for most of the questions the interviewer seemed disappointed and wanted more out of me.