Q1. What is an ETL process? A1. ETL is a architectural style, and it stands for Extract, Transform and Load. Extract does the process of reading data from an input data source like file, database, etc. … Read more ›...
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05: Linear regression outputs, null hypothesis, t-test & p-value interview Q&As
Q1. How do you produce & interpret Linear Regression output? A1. Scatter plots can only detect obvious relationships between variables by looking at the graph, but we can use statistics to comment about the variable relationships as outlined below. The link 11A: Databricks – Spark ML – Pandas Dataframe &...
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05: Pyspark read from a file & add new columns interview Q&As with tutorial
This extends Pyspark with schema & a simple join of two data frames example.
Q08: How would you read csv data into a spark Dataframe?
A08: Here is the tutorial step by step that reads employee.csv file into the Dataframe.
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05: Q37 – Q50 Apache Flume interview questions & answers
Q37. Where do use Apache Flume in the BigData world? A37. Apache Flume is used to ingest big data into HDFS. BigData is generally ingested from 1) Sporadic bulk loading processes, such as database and mainframe offloads and batched data dumps from legacy systems. … Read more ›...
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05: Q37-Q41 – Data lake & metadata interview Q&As
Q37. What is a Data Lake? A37. A data lake is a storage repository that holds a vast amount of structured, semi-structured, and unstructured raw data in its native format (aka pristine condition). The data structure and requirements are not defined until the data is needed. … Read more ›...
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05: Snowflake interview questions & answers – Stored Procedures, Session Variables, UDFs, etc
Q01. What is stored procedure in Snowflake? A01. Snowflake stored procedure lets you perform database operations by executing multiple SQL statements by automating repetitive tasks like cleaning up data by deleting records older than a specified date. … Read more ›...
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06: 50+ SQL scenarios based interview Q&As on unique N items per group
This extends 15+ SQL scenarios based interview Q&As on N items per group – part 5 This SQL scenarios based interview questions & answers focus on N items per group. These examples were done on MySQL v8.0 at www.db-fiddle.com. … Read more ›...
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06: Azure interview Q&As on Resource Groups & Resource Manager
Q01. What is an Azure Resource Manager (i.e. ARM)? A01. ARM is the native platform for infrastructure as code (IaC) in Azure. It enables you to centralise the management, deployment, and security of Azure resources. … Read more ›...
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06: Databricks interview questions & answers – SQL connectivity
Q01. How can you connect to Databricks for SQL? A01. SQL connectivity is very useful to access data from Databricks lakehouse from your code, JMeter for performance testing and from the command line (e.g. dbsqlcli) or SQL GUI clients like DBeaver for interactive querying. … Read more ›...
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06: Learn how to access Hive from Spark via SparkSQL & Dataframes by example
These Hadoop tutorials assume that you have installed Cloudera QuickStart, which has the Hadoop eco system like HDFS, Spark, Hive, HBase, YARN, etc. This example extends Learn Hive to write to and read from AVRO & Parquet files by examples to access Hive metastore via Spark SQL. … Read more...
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06: Pyspark SCD Type 1 & Type 2 Interview Q&As with tutorials
This extends Pyspark with schema & a simple join of two data frames example. Q13: What is SCD Type 1, and how will you implement it in pyspark? A13: SCD stands for Slowly Changing Dimension, … Read more ›...
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06: Q51 – Q61 HBase Interview Questions & Answers
Q51. Is HBase a relational database? A51. HBase is not a relational database. It is a NoSQL database. Hbase is a column-oriented (aka columnar) database management system, which runs on top of HDFS (Hadoop Distribute File System). Q52. … Read more ›...
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07: 50+ SQL scenarios based interview Q&As on Pivot Vs. Unpivot
Q01 Often you will have a requirement to report on a certain dimension, which requires you to convert rows into columns or columns into rows. How will you go about accomplishing this using SQL?
A01 The process of converting rows into columns is know as “
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