Lumina Datamatics Team Lead Interview Questions and Answers

A SQL join is used to combine rows from two or more tables based on a related column between them.

• Use the JOIN keyword to specify the tables to be joined

• Use the ON keyword to specify the column to join on

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

Two common SQL joins are INNER JOIN and LEFT JOIN.

• 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.

Object-oriented programming concepts that focus on data encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: bundling data and methods that operate on the data into a single unit (class)

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

• Polymorphism: ability for objects of different classes to respond to the same message

• Abstraction: hiding the complex implementation det

The Plate with a Hole concept is a design technique used to reduce stress concentrations in a material.

• The concept involves creating a hole in a plate to distribute stress more evenly.

• It is commonly used in engineering and manufacturing.

• The size and location of the hole must be carefully considered to achieve the desired effect.

• Examples include the use of holes in aircraft wings to reduce weight and improve aerodynamic...read more