30+ Yardi Systems Interview Questions and Answers

Use SQL JOIN to combine two tables and display information.

• Use the JOIN keyword to combine tables based on a related column

• Specify the columns you want to display in the SELECT statement

• Use ON clause to specify the column used for joining the tables

Print numbers in pyramid shape patterns using SQL code.

• Use a loop to iterate through rows and columns to print the numbers in pyramid shape.

• Increment the numbers in each row to create the pyramid effect.

• Consider the spacing and alignment to create a visually appealing pyramid pattern.

List is a collection of objects, string array is an array of strings, etc. Each has its own characteristics and uses.

• List: dynamic collection of objects, can grow/shrink in size. Example: List numbers = new ArrayList<>();

• String array: fixed-size array containing strings. Example: String[] names = new String[3];

• Array: fixed-size collection of elements of the same type. Example: int[] scores = new int[5];

Code to sort array without sort function

• Iterate through the array and compare each element with the rest to find the smallest element

• Swap the smallest element with the first element in the unsorted portion of the array

• Repeat the process for the remaining unsorted portion of the array until fully sorted

Answers to questions related to SQL concepts like functions, stored procedures, triggers, joins, and constraints.

• Functions return a value while stored procedures do not.

• Triggers are special types of stored procedures that are automatically executed in response to certain events.

• Cross join is used to combine each row from one table with every row from another table.

• Joins are used to combine data from two or more tables based on a related column.

• HAVING is used to filter data ba...read more

Object-oriented programming concepts that focus on classes, objects, inheritance, encapsulation, and polymorphism.

• Classes: Blueprint for creating objects with attributes and methods.

• Objects: Instances of classes that contain data and behavior.

• Inheritance: Ability for a class to inherit attributes and methods from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability for objects of different classes to respond ...read more

SQL join types allow combining data from multiple tables based on a specified condition.

• Inner Join: Returns rows that have matching values in both tables.

• Left Join: Returns all rows from the left table and the matched rows from the right table.

• Right Join: Returns all rows from the right table and the matched rows from the left table.

• Full Outer Join: Returns all rows when there is a match in either left or right table.

• Self Join: Joining a table with itself to combine rows base...read more

Different types of joins in SQL include inner join, outer join, left join, right join, and full join.

• Inner join: Returns rows when there is a match in both tables

• Outer join: Returns all rows from one table and only matching rows from the other table

• Left join: Returns all rows from the left table and the matched rows from the right table

• Right join: Returns all rows from the right table and the matched rows from the left table

• Full join: Returns rows when there is a match in one...read more

Key types in SQL include primary keys, foreign keys, unique keys, and composite keys.

• Primary key: uniquely identifies each record in a table.

• Foreign key: establishes a relationship between two tables.

• Unique key: ensures that all values in a column are unique.

• Composite key: combination of multiple columns to uniquely identify a record.

SQL inner join combines rows from two or more tables based on a related column between them.

• Inner join retrieves rows from both tables that have matching values in the specified column

• Syntax: SELECT column_name(s) FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name

• Example: SELECT Orders.OrderID, Customers.CustomerName FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID

Ci/cd pipeline automates the process of building, testing, and deploying code changes.

• Automates code integration, testing, and deployment

• Ensures consistency and reliability in software delivery

• Facilitates faster feedback loops for developers

• Examples: Jenkins, GitLab CI/CD, Azure DevOps

SQL queries for select, create, and delete statements

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

• CREATE statement is used to create a new table in the database

• DELETE statement is used to remove rows from a table based on a condition

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 manages databases.

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

• RDBMS uses SQL for querying and managing data, while DBMS may or may not support SQL.

• Exa...read more

SQL commands are used to interact with databases, such as SELECT, INSERT, UPDATE, DELETE.

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE.

• SELECT is used to retrieve data from a database.

• INSERT is used to add new records to a table.

• UPDATE is used to modify existing records in a table.

• DELETE is used to remove records from a table.

Joins are used to combine data from two or more tables based on a related column.

• Inner join returns only the matching rows from both tables.

• Left join returns all the rows from the left table and matching rows from the right table.

• Right join returns all the rows from the right table and matching rows from the left table.

• Full outer join returns all the rows from both tables.

• Cross join returns the Cartesian product of both tables.

SQL query with join and pseudo code with array

• SQL query with join: SELECT column_name(s) FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name

• Pseudo code with array: for each element in array, do something

Questions related to QA

• Explain the difference between verification and validation

• Describe a scenario where you found a critical bug

• How do you prioritize test cases?

Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.

• Types of inheritance: single inheritance, multiple inheritance, multilevel inheritance, hierarchical inheritance

• Single inheritance: a class inherits from only one parent class. Example: class Dog inherits from class Animal

• Multiple inheritance: a class inherits from multiple parent classes. Example: class Manager inherits from classes Employee and Leader

• Mu...read more

Program to print star pattern in a specific shape

• Use nested loops to control the number of rows and columns

• Use if-else statements to determine when to print a star or a space

• Experiment with different loop conditions to create various patterns

Oops pillars refer to the four main concepts of object-oriented programming: Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Abstraction focuses on hiding the complex implementation details and showing only the necessary features of an object.

• Polymorphism allows objects to be treated as instance...read more

Function overloading is the ability to define multiple functions with the same name but different parameters in a class.

• Allows multiple functions with the same name but different parameters to be defined in a class

• Helps improve code readability and maintainability

• Example: void print(int num) and void print(string text) can both be defined in a class

Truncate removes all data from a table, while delete removes specific rows.

• Truncate is faster than delete as it doesn't log individual row deletions.

• Truncate resets the identity of the table, while delete doesn't.

• Truncate can't be rolled back, while delete can be.

• Truncate doesn't fire triggers, while delete does.

SQL joins are used to combine rows from two or more tables based on a related column between them.

• INNER JOIN: Returns rows when there is at least one match in both tables

• LEFT JOIN: Returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN: Returns all rows from the right table and the matched rows from the left table

• FULL JOIN: Returns rows when there is a match in one of the tables

• CROSS JOIN: Returns the Cartesian product of the two tables

Oops 2 pillars are Abstraction and Encapsulation.

• Abstraction: Hiding unnecessary details and showing only relevant information. Example: Car dashboard displaying speed without showing internal engine details.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class in object-oriented programming encapsulates data and methods.

Inheritance is a concept in object-oriented programming where a class inherits attributes and methods from another class.

• Child class inherits properties and behaviors from a parent class

• Allows for code reusability and promotes a hierarchical relationship between classes

• Example: Animal class can be a parent class with properties like name and methods like eat, and Dog class can inherit from Animal class with additional properties like breed

Basic SQL queries are used to retrieve, insert, update, and delete data from a database.

• SELECT * FROM table_name - retrieves all data from a table

• INSERT INTO table_name (column1, column2) VALUES (value1, value2) - inserts data into a table

• UPDATE table_name SET column1 = value1 WHERE condition - updates data in a table based on a condition

• DELETE FROM table_name WHERE condition - deletes data from a table based on a condition

Code to simulate elevator working

• Create a class for Elevator with attributes like current floor, direction, and list of requests

• Implement methods for moving the elevator up or down, adding requests, and handling stops

• Use a queue data structure to manage the requests in the order they are received

Objects are instances of classes in object-oriented programming (OOP). Classes define the blueprint for objects.

• Objects are instances of classes

• Classes define the blueprint for objects

• Objects have attributes and behaviors defined by their class

• Classes can be used to create multiple objects with similar properties and methods

To join two tables, use the JOIN keyword in SQL with a common column between them.

• Use the JOIN keyword to combine rows from two or more tables based on a related column between them

• Specify the columns to join on using the ON keyword

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

Masking is a technique used in graphic design to hide or reveal certain parts of an image or text.

• Use tools like the pen tool or selection tools to create a mask

• Apply the mask to the desired layer to hide or reveal parts of the image

• Experiment with different blending modes and opacity levels for creative effects