Power apps interview questions for freshers/Power apps Interview Questions and Answers for Freshers & Experienced

What are some of differences in data modeling between Power BI Desktop and Power Pivot for Excel?

Here are some of the differences:

1. Power BI Desktop supports bi-directional cross filtering relationships, security, calculated tables, and Direct Query options.

2. Power Pivot for Excel has single direction (one to many) relationships, calculated columns only, and supports import mode only. Security roles cannot be defined in Power Pivot for Excel.

What is xVelocity in-memory analytics engine used in Power Pivot?

The main engine behind power pivot is the xVelocity in-memory analytics engine. It can handle large amount of data because it stores data in columnar databases, and in memory analytics which results in faster processing of data as it loads all data to RAM memory.

What is Power Pivot Data Model?

It is a model that is made up of data types, tables, columns, and table relations. These data tables are typically constructed for holding data for a business entity.

What is Power Pivot?

Power Pivot is an add-in for Microsoft Excel 2010 that enables you to import millions of rows of data from multiple data sources into a single Excel workbook. It lets you create relationships between heterogeneous data, create calculated columns and measures using formulas, build PivotTables and PivotCharts. You can then further analyze the data so that you can make timely business decisions without requiring IT assistance.

What are the different Excel BI add-in?

Below are the most important BI add-in to Excel:

* Power Query: It helps in finding, editing and loading external data.
* Power Pivot: Its mainly used for data modeling and analysis.

* Power View: It is used to design visual and interactively reports.
* Power Map: It helps to display insights on 3D Map.

What are some benefits of using Variables in DAX ?

Below are some of the benefits:

* By declaring and evaluating a variable, the variable can be reused multiple times in a DAX expression, thus avoiding additional queries of the source database.

* Variables can make DAX expressions more intuitive/logical to interpret.

* Variables are only scoped to their measure or query, they cannot be shared among measures, queries or be defined at the model level.

What is special or unique about the CALCULATE and CALCULATETABLE functions?

These are the only functions that allow you modify filter context of measures or tables.

* Add to existing filter context of queries.
* Override filter context from queries.
* Remove existing filter context from queries.

Limitations:

* Filter parameters can only operate on a single column at a time.
* Filter parameters cannot reference a metric.

How is the FILTER function used?

The FILTER function returns a table with a filter condition applied for each of its source table rows. The FILTER function is rarely used in isolation, it’s generally used as a parameter to other functions such as CALCULATE.

* FILTER is an iterator and thus can negatively impact performance over large source tables.

* Complex filtering logic can be applied such as referencing a measure in a filter expression.
FILTER(MyTable,[SalesMetric] > 500)

What are the most common DAX Functions used?

Below are some of the most commonly used DAX function:

SUM, MIN, MAX, AVG, COUNTROWS, DISTINCTCOUNT
IF, AND, OR, SWITCH
ISBLANK, ISFILTERED, ISCROSSFILTERED
VALUES, ALL, FILTER, CALCULATE,
UNION, INTERSECT, EXCEPT, NATURALINNERJOIN, NATURALLEFTEROUTERJOIN,
SUMMARIZECOLUMNS, ISEMPTY,
VAR (Variables)
GEOMEAN, MEDIAN, DATEDIFF

What is DAX?

To do basic calculation and data analysis on data in power pivot, we use Data Analysis Expression (DAX). It is formula language used to compute calculated column and calculated field.

* DAX works on column values.
* DAX can not modify or insert data.
* We can create calculated column and measures with DAX but we can not calculate rows using DAX.

Sample DAX formula syntax:

For the measure named Total Sales, calculate (=) the SUM of values in the [SalesAmount] column in the Sales table.

What are content packs in Power BI?

Content packs for services are pre-built solutions for popular services as part of the Power BI experience. A subscriber to a supported service, can quickly connect to their account from Power BI to see their data through live dashboards and interactive reports that have been pre-built for them. Microsoft has released content packs for popular services such as Salesforce.com, Marketo, Adobe Analytics, Azure Mobile Engagement, CircuitID, comScore Digital Analytix, Quickbooks Online, SQL Sentry and tyGraph.

What are Building Blocks in Power BI?

The following are the Building Blocks (or) key components of Power BI:

1. Visualizations: Visualization is a visual representation of data.
Example: Pie Chart, Line Graph, Side by Side Bar Charts, Graphical Presentation of the source data on top of Geographical Map, Tree Map, etc.

2. Datasets: Dataset is a collection of data that Power BI uses to create its visualizations.
Example: Excel sheets, Oracle or SQL server tables.

3. Reports: Report is a collection of visualizations that appear together on one or more pages.
Example: Sales by Country, State, City Report, Logistic Performance report, Profit by Products report etc.

4. Dashboards: Dashboard is single layer presentation of multiple visualizations, i.e we can integrate one or more visualizations into one page layer.
Example: Sales dashboard can have pie charts, geographical maps and bar charts.

5. Tiles: Tile is a single visualization in a report or on a dashboard.
Example: Pie Chart in Dashboard or Report.

What data sources can Power BI connect to?

The list of data sources for Power BI is extensive, but it can be grouped into the following:

<> Files: Data can be imported from Excel (.xlsx, xlxm), Power BI Desktop files (.pbix) and Comma Separated Value (.csv).

<> Content Packs: It is a collection of related documents or files that are stored as a group. In Power BI, there are two types of content packs, firstly those from services providers like Google Analytics, Marketo or Salesforce and secondly those created and shared by other users in your organization.

<> Connectors to databases and other datasets such as Azure SQL, Databaseand SQL, Server Analysis Services tabular data, etc.

What is Power BI Desktop?

Power BI Desktop is a free desktop application that can be installed right on your own computer. Power BI Desktop works cohesively with the Power BI service by providing advanced data exploration, shaping, modeling, and creating report with highly interactive visualizations. You can save your work to a file or publish your data and reports right to your Power BI site to share with others.

What is Power BI?

Power BI is a cloud-based data sharing environment. Once you have developed reports using Power Query, Power Pivot and Power View, you can share your insights with your colleagues. This is where Power BI enters the equation. Power BI, which technically is an aspect of SharePoint online, lets you load Excel workbooks into the cloud and share them with a chosen group of co-workers. Not only that, but your colleagues can interact with your reports to apply filters and slicers to highlight data. They are completed by Power BI, a simple way of sharing your analysis and insights from the Microsoft cloud.

What are datatypes in PowerApps?

Datatypes are basically the types of values that powerapp has. The powerapps datatypes form when you create your app using powerapps studio, especially when creating a data source. Datatypes in powerapps are either supported by powerapps or custom datatypes.

You are given a task to include the sentiment analysis feature in your app. How can you do this?

We can make use of AI models created using AI Builder. Note that the AI builder service is not available in all the locations. Thus, be careful when you choose the environment you want to work in, the AI Builder support is available.

What are DLP Policies used for?

We can create DLP policies that can act as guardrails to help prevent unintentionally exposing organizational data. You need to be a tenant admin or have the Environment Admin role.

How are you using the canvas app's media files?

In PowerApps, you can upload up to 200 MB of media per app. The most commonly recommended approach, however, is to use blob/media storage services. Azure Storage and Azure Media Service are two examples, and you can then embed your media URL into the app.

Is it essential to combine various data sources into a single canvas app?

Yes, it is. Power Apps allows you to create an unlimited number of connections. Once the connections are formed with an account, you can use an unlimited number of data sources in a single app.

What are the various methods for submitting data from the power apps?

The Patch() and Submitform() functions can be used to submit data. The Patch() function can be used to perform a partial data update.

What is the difference between an Action and a Trigger in MS-Flow?

Adjustments aimed directly by a User are referred to as actions. For example, you can use an action to perform SQL Database operations such as lookup, update, and delete data. All actions will be directly mapped to Swagger operations.

Triggers: Several connectors include triggers that will notify your app when certain events occur. Consider the case of an FTP connector with the OnUpdatedFile trigger. You can create a Logic App or a flow that listens for this trigger and takes action whenever it fires.

Triggers are classified into two types.

Polling Triggers: These triggers can call your service at a specific frequency to check for new data. When new data becomes available, it will trigger a new run of your workflow instance with the data as input.

Push Triggers: Such triggers can pay any attention to data on an endpoint, which means they will wait for an event to happen. When the event occurs, your workflow instance is restarted.

Does the use of more and more connections in an app degrade the performance?

Yes, we can say that. For eg: If we want to capture the details of an employee using an Office 365 connection, it can be a better choice to use a collection and store the details rather than using the connection every time when a piece of info is needed.

Which are the types of variables that are used in PowerApps?

Global variables and Context variables.

In a collaborative environment, how can you ensure the versioning of a canvas app when there are regular updates rolled out?

While saving the app, a version-specific note or comment can be left. Also, we can use a label on the Home screen of the app representing a version number that can be maintained manually by the app maker.

What are Actions?

A powerapp action is a link between powerapps and an external system. For example: we can create a powerapp that reads data from an excel file and loads it into powerapps list. This powerapp will have one action, which read data from excel file.

Why is the Patch function used in canvas apps?

A power apps canvas app lets users make their own powerapps. In powerapps, power users can select from a list of functions and choose the ones they wish to use.

The powerapps patch function is used when there are many conditions in one powerapp and if they all have to be satisfied the user has to go over all these powerapps and then use powerapps patch.

The powerapps patch function basically lets the user combine multiple powerapps into one powerapp by using an if-then statement.

How do you use the media files in the canvas app?

You can upload up to 200 MB of media per app in PowerApps. However, the most suggested approach is to use blob/media storage services. Few examples are Azure Storage or Azure Media Service and you can then embed your media URL to the app.

Is it possible to use multiple data sources in a single canvas app?

Yes. Power Apps allows you to create any number of connections, once the connections are created using an account, any number of data sources can be used in a single app.

How is it possible to create a different user environment in the PowerApps?

An environment is referred to as a space that is used for storing, managing, and sharing your organization's business data, apps, and flows. It is also considered as a container that is capable of separating the apps that might contain different roles, security requirements, or target audiences. The usage of the environments depends upon your organization and the apps that you are trying to build.

List out the different ways in which you can submit the data from the powerapps?

Data can be submitted using Patch() and Submitform() function. You can do a partial data update using Patch() function.

How to make use of the components in the canvas apps?

Components are referred to as the reusable building blocks for canvas apps so that app makers will be allowed to create the custom controls and use them across apps. Components can either be exported and imported in different apps across organizations. The Components are helpful and allow you to build larger apps that have the same control patterns. For example, we can build a navigation control and use it across our app on different screens. Once a component is updated, all instances in the app will be reflecting your changes. Components make sure that the performance is enhanced or improved and will also help in standardizing the look and feel of PowerApps applications in an organization. A component also consists of the input properties that are capable of receiving values from the app, and the component can make use of these internally. Components also include the output properties that are capable of providing output values to the app.

Is it possible to create PowerApps without gaining access to a license?

No. Neither creation nor consumption of PowerApps is possible without a license.

How can a local or global variable be defined or used in PowerApps?

To do so, the Set function is used to set the global variable’s value. This holds an information piece temporarily, like the result of operational data or the number of times somebody has clicked a button. And then, the UpdateContext function is used to create the content variable, which holds information temporarily.

How different user environments can be created in PowerApps?

An environment is referred to as the space to keep, manage and share the data, apps, and flow of the business. It can also be regarded as a container that distinguishes apps on the basis of different target audiences, security needs, and roles. However, creating or choosing the environment used basically depends upon the company and the apps you are thinking to develop.

What is a collection, and how can they be created?

This one is a special type of data source, which is not connected to the service of the cloud but local to the app. This is generally used as the local to the device and cannot be shared among devices for one or multiple users. Also, they can be saved as well as retrieved locally. To operate collections, Clear function, ClearCollect, and Collect can be used.

How is it possible to use media files in the Canvas app?

Up to 200 MB of media for each app can be uploaded in PowerApps. However, what is majorly recommended is using media/blog storage services, such as Azure Media or Azure Storage, and embed the media URL to the app.

How can Error Handling be implemented in PowerApps?

To do so, first, we will have to get information about any errors through the Errors function. And then, through Validation and DataSourceInfo, some of the errors can be ignored even before they take place.

What is Action and Trigger in MS-Flow?

Actions: Actions refer to the changes directed by a User. For Ex. you can use an action to perform the operations like lookup, update, delete data in SQL Database. All actions will be directly mapped to operations defined in Swagger.

Triggers: Several connectors provide triggers that will help in notifying your app when specific events take place. Let us consider an example of an FTP connector that has the OnUpdatedFile trigger. You can build either a Logic App or a flow that listens to this trigger and performs action whenever the trigger fires.

There are two types of triggers.

Polling Triggers: These triggers are capable of calling your service at a particular frequency to check for new data. Whenever there is new data is available, it will cause a new run of your workflow instance with the data as input.

Push Triggers: These triggers are capable of listening for data on an endpoint, which means that they will wait for an event to occur. Whenever the event occurs, it causes a new run of your workflow instance.

Does Flow depend on Power Apps or vice versa?

No, and that’s actually very easy to get confused. PowerApps is the new form of the solution, the quick and easy web-based or device-agnostic way which helps in creating an application that is oriented towards mobile being routed to SharePoint for forms. It also makes use of the Flow heavily, but it does not need Flow. And vice versa, Flow can make use of Power Apps, and is often using Power Apps as a frontend for what it does but it does not require Power Apps.

What are the different ways to submit data from PowerApps?

This task can be executed by using two functions – Patch() and Submit form(). However, Patch() can also be used to upload partial data.

Illustrate the major differences between Canvas App and Model-driven App?

Canvas Apps: Canvas App are those apps that start with your user experience, allowing you to craft a highly tailored interface with the power of a blank canvas and connecting it to at least 200 data sources. You are also allowed to build canvas apps for web, mobile, and tablet applications. Canvas apps provide you with the flexibility to arrange the user experience and interface in the way you would need. It also allows your creativity and business sense to engage and guide you on how you want your apps to be represented.

Model-driven Apps: Model-driven Apps are those apps that start with your data model which will be building up from the shape of your core business data and processes in the CDS to model forms, views, and many other components. Model-driven apps will automatically generate great user interfaces that are responsive across devices. Whenever you create a model-driven app, you are allowed to make use of all of the power of the Common Data Service to rapidly configure your forms, business rules, and process flows. You are also allowed to model-driven apps from the Power Apps site.

What is Common Data Service?

Common Data Service will allow you to securely store and manage data that is used by business applications. The Data that is present within Common Data Service is stored in the form of a set of entities. An entity is referred to as a set of records that are used for storing the data, which is similar to how a table stores data within a database. Common Data Service also contains a base set of standard entities that will be covering the typical scenarios, but you can also create custom entities that are specific to your organization and populate the same with data using Power Query. App makers will make use of PowerApps to build rich applications using this data.

Briefly explain the process of defining and using a local or global variable in power apps?

you will need to use the Set function to set the value of a global variable, this will temporarily hold a piece of information, like the number of times the user will select a button or the result of the data operation.

You will need to use the UpdateContext function that helps in creating a context variable, this will temporarily hold a piece of information, like the number of times the user will select a button or the result of the data operation.

What is meant by a collection? What is the process involved in the creation of a collection?

Collection is referred to as a special kind of data source, that is said to be local to the app and will not be connected to the cloud service. A collection data is said to be local to the device and is not allowed to be shared across devices for the same user or different users. Collections can be either saved and retrieved locally from the device. There are some functions that can be used to manipulate the collections like Collect, ClearCollect, and Clear.

Is it possible to use multiple data sources in one canvas app?

Yes. With PowerApps, you can create any number of connections. Once it is done, any number of data sources can be used in one app.

What are the types of apps that can be created in PowerApps?

PowerApps is one productivity development platform that allows us to create canvas apps, common data services, model-driven apps, and portals.

Define common data services, and why should we use them?

Common data service lets the data get integrated from different sources into one store that can be easily used in Power Automate, Power Virtual Agent, Power BI, and PowerApps. This makes the app developing experience seamless.

What is the difference between a Model-driven app and a Canvas app?

Model-driven apps use a component-based methodology to develop a significant app. They comprise various components, like dashboards, business processes, forms, charts, views, and entities that create a UI. On the other hand, canvas apps begin with user experience and enable customization interference through different UI controls, like charts, media, drop-down lists, text-input boxes, labels, and more.

What are PowerApps?

PowerApps is a Platform as a Service. It enables you to create mobile apps that run on different operating systems, such as Windows, iOS, and Android. At its core, it is a suite of data platforms, connectors, services, and apps that offer a quick application development environment to create custom apps for the business requirements.

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