Looker Interview Questions

Businesses are looking for correlations between data sets in order to gain important insights. Trying to profit from the strengths of each data collection is a business aspiration. Looker is a critical business intelligence tool for organizations that enables them to create perceptive visuals. It has an intuitive user interface, i.e., completely browser-based, and encourages dashboard interaction.

The Looker tool is used by companies such as Chime, DigitalOcean, Typeform, and more to create visualizations and interfaces. According to payscale.com, the typical annual compensation for a Looker developer in the US is about $110K. Therefore, you have the chance to develop a lucrative career with Looker. In this blog, we will discuss top Looker Interview Questions and Answers that help you ace the interview.

Looker Interview Questions and Answers

Q1) What is the definition of the term "Business Intelligence"?

Ans: Organizations of all sizes perform a variety of procedures or activities that result in the generation of massive amounts of data. The data contains important information that may be used to improve corporate operations. That is where Business Intelligence Capabilities come into play, assisting firms in meaningful data exploration. The capacity to make better informed and data-driven decisions are enhanced by timely data processing and accurate reporting.

Q2) Describe the Data Flow.

Ans: It is mostly a task that is done with the assistance of an SSIS package and is responsible for data transformation. The source and destination are always clearly defined, and users may easily keep up with the amendments and modifications.

Q3) How Do You Define Logistic Regression?

Ans: It is essentially a method that is recognized for accurately verifying a dataset that contains unbiased variables. The validation level is determined by how accurately the final findings are dependent on these factors. It is not always appropriate to remove them as indicated.

Q4) What do you mean by Looker Business Intelligence?

Ans: The BI software from Looker assists in the exploration and analysis of data. We can bring together data from many sources to produce a cohesive perspective. Other than data, we can then create real-time metrics and simply distribute them. It has some impressive visuals and drill-down interfaces.

Q5) Describe what a drill-down analysis is.

Ans: Drilling down is a feature that most business intelligence systems have. It enables a thorough examination of data and provides in-depth conclusions. You may dive down into a study or showcase component to obtain more detailed information about it.

Q6) Describe the complete cache mode.

Ans: The usual cache style setting is full cache mode. Prior to execution, the benchmark result group will be cached. The complete dataset from the defined site search location will then be retrieved and stored. The full cache option is optimal when dealing with big data sets.

Q7) What is the SSIS acronym?

Ans: SQL Server Integration System is abbreviated as SSIS. It is a relational component that is used to create processes for file transfer activities. It is an extraction, transformation, and loading (ETL) tool that collects data from many sources, changes it, and imports it into a new destination.

Q8) Explain Pivoting.

Ans: Pivoting is a term that refers to the process of transferring data from columns to rows and conversely. Pivoting ensures that no information is lost either in a row or column when the same information is being shared.

Q9) What Does The Term "Drilling" Mean In Data Analysis?

Ans: It is essentially a strategy for analyzing the information contained in data that appears to be helpful. Additionally, it might be regarded as a way to avoid issues such as legitimacy and copyright.

Q10) Give the advantages of using Looker?

Ans: The advantages of Looker are:

• Data Administration - We assess and quantify the organization's current and future potential.
• Integrations - This indicates the capacity of a system to communicate with other platforms that provide a variety of sources and functions.
• Data Management - Looker converts reports to a variety of file types and distributes analytical findings.

Looker BI Tool Interview Questions

Q11) Describe OLTP.

Ans: Online Transaction Processing enables transaction-oriented programs to access information. It is concerned with a firm's day-to-day operations. It entails updating, adding, and removing tiny portions of data from a database. Because it works with tiny data sets, the execution frequency is higher.

Q12) Distinguish between the no-cache and partial cache modes.

Ans: When the benchmark set of data is too big to import into memory, the no-cache mode is utilized. Whenever the content is relatively tiny in size, the partial cache method is employed. Using partial cache mode, the query index is well-indexed, resulting in quicker results.

Q13) Describe the Drilling Process.

Ans: Drilling is a technique that we employ to delve into the intricacies of relevant data. Moreover, we might consider it for resolving concerns such as legitimacy and licensing.

Q14) What is the full form of NDTs?

Ans: NDTs are an abbreviation for Native Derived Tables. By supplying the exploration variable on the data structure through the appropriate columns, we may build NDTs.

Q15) Are logs related to packages?

Ans: Yes, the logs are package-specific. You may activate package logging using the logging settings.

Q16) Describe the heap analysis of user flow in Looker.

Ans: Heap automatically syncs user activity such as clicks, gestures, and actions across web-based applications. It enables data enrichment through the use of bespoke APIs. This will aid in the analysis of user activities and their visual presentation.

Q17) How is data cleaning defined?

Ans: In general, we have a variety of techniques for eliminating mistakes and discrepancies from datasets. Data cleaning is a term that refers to the combination of various techniques. These techniques are intended to improve the quality of information.

Q18) Describe a few approaches for data cleaning.

Ans: This can be accomplished in any manner. However, the first point to remember is the scope of the data. If it is very large, it should be split into smaller components. Evaluating the precise facts is another strategy that might be used. Moreover, developing utility qualities is quite useful and dependable.

Q19) What are Looker blocks?

Ans: Looker Blocks are pre-configured portions of LookML code that expedite the analytics process. You may utilize these looker blocks and modify them to meet the unique requirements. They assist to develop adaptive and rapid analytics.

Q20) Is it OK to utilize templated filters in PDTs?

Ans: Generally, it is not advised to use templated filters. Each time the filter is changed, the table is rebuilt, putting a lot of burden on the system.

Looker Developer Interview Questions

Q21) Why are duplicates of tables generated in a database's same PDT?

Ans: When you modify the SQL of a generated table and access it, the PDT creates a new replica of the table. Table clones are produced only when the SQL in development mode differs from the SQL in continuous mode.

Q22) How would you define Logistic Regression?

Ans: Logistic Regression is a technique that was developed for the purpose of thoroughly verifying a dataset that contains unbiased variables. The verification level is determined by the degree to which the overall results are dependent on these factors. It is not always a good idea to alter them once they have been stated.

Q23) What purpose does the SQL runner serve?

Ans: SQL runner enables immediate access to various databases and supports much accessibility. SQL runner performs exploration and query creation.

Q24) Describe the methods that are beneficial when dealing with Multiple-Supply Issues?

Ans: The methods are:

• Identification of related records.
• Schema reorganization.

Q25) Is it possible to filter the data using table calculations?

Ans: Yes, we may filter the data in the table computations using definite logic.

Q26) Which deployment method is preferable, SQL Server or File System?

Ans: As contrasted to File System deployment, SQL Server deployment is superior. SQL server development is a lightning-fast operation. As a result, it produces rapid outcomes. Additionally, it ensures data security.

Q27) What do you mean when you refer to SSIS package deployment?

Ans: We have a file labeled as the manifest file in SSIS. It always ensures that the packages contain trustworthy or permitted data and are not in violation of any policies. Users can install the same in either the System files or SQL Server, depending on their allotment or constraints.

Q28) What Are The Two Most Frequently Used Data Validation Methods?

Ans: Error Detection and Data Screening. Both of those approaches are identical but are presented in unusual ways.

Q29) What data is used to calculate the table values?

Ans: Following the result of the query, table computations are performed. They perform operations on the data contained in the exploration table.

Q30) What is the "Rebuild Derived Tables and Run button" used for?

Ans: It is used to initiate a rebuild of any permanent dependent tables affected by the request. Also, we utilize this to initiate the rebuild of all upstream PDTs.