Robertshaw Controls Interview Questions and Answers

Use GROUP BY and HAVING clause to find duplicate rows in a table without using DISTINCT.

• Use GROUP BY to group rows with the same values together

• Use HAVING clause to filter out groups with only one row

• Select columns to display duplicate rows

Redux is a predictable state container for JavaScript apps, commonly used with React to manage application state.

• Redux helps in managing the state of the application in a predictable way.

• It provides a single source of truth for the state of the application.

• Redux allows for easier debugging and testing of the application.

• Actions are dispatched to update the state in Redux.

• Reducers specify how the state changes in response to actions.

Create a form to input data and display it below the form.

• Create an HTML form with input fields for data entry

• Use JavaScript to capture the form data on submission

• Display the captured data below the form using DOM manipulation

The code snippet prints the numbers from 1 to 5 in reverse order.

• The code uses a for loop starting from 5 and decrementing by 1 until 1.

• Each iteration of the loop prints the current number.

Event loop is a mechanism that allows for asynchronous programming by handling and executing events in a loop.

• Event loop is a part of the runtime environment in JavaScript.

• It manages the execution of multiple tasks by putting them in a queue and processing them one by one.

• Event loop allows for non-blocking I/O operations, making the code more efficient.

• Example: setTimeout() function in JavaScript uses event loop to execute the callback function after a specified delay.