Q01. What are stages in Snowflake? A01. Snowflake stages are locations where data files are temporarily stored (i.e. staged) for loading and unloading data from & to Snowflake tables. The stages can be internal or external Internal Stage Internal storages are used for loading data from local files or other...
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04: 50+ SQL scenarios based interview Q&As on Nth value
This SQL scenarios based interview questions & answers focus on nth highest value or nth lowest value. These examples were done on MySQL v8.0 at www.db-fiddle.com. This will answer questions like:
Problem statements & hints
1) Who gets the 2nd highest salary?
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04: Azure interview Q&As on compute
Q01. What are the Compute options Azure provide? A01 Azure compute services can be IaaS, PaaS and Serverless. Azure provides: 1) Azure Virtual Machines (i.e. VMs) are IaaS allowing you to deploy and manage VMs inside a virtual network (VNet). … Read more ›...
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04: Databricks – Spark SCD Type 2
Prerequisite: Extends 03: Databricks – Spark SCD Type 1. What is SCD Type 2 SCD stands for Slowly Changing Dimension, and it was explained in 10 Data warehouse interview Q&As. … Read more ›...
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04: Databricks interview questions & answers – read & write from Dataframe
Q1. What is a medallion architecture? A1. A medallion architecture is a data design pattern used to organise data in a lakehouse with the view of incrementally and progressively improving the structure and quality of data as it flows through each layer of the architecture from Bronze ⇒ Silver ⇒...
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04: Pyspark testing interview Q&As with pytest tutorial
This extends Pyspark testing interview Q&As with unittest tutorial. Q04: How would you go about writing init tests to test your pyspark transformations and functions? A04: Here is a complete example using a popular python third-party testing library pytest. … Read more ›...
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04: Residuals, Cost/Loss functions, R-squared & Gradient Descent interview Q&As
Q01. What do you understand by the terms mean, variance, and standard deviation of the sample Vs. the population? A01. Given that the following are the number of job applications sent by 6 individuals:
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X = 17, 15, 23, 7, 9 and 13 |
Where X is the Sample. … Read more ›...
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04: Snowflake interview questions & answers – security, monitoring & recovery
Q01. What is RBAC, which is Role Based Access Control in Snowflake? A01. RBAC is a security model that restricts access to data & resources based on the roles assigned to users. … Read more ›...
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04a: Databricks – Spark SCD Type 1 with Merge
Prerequisite: Extends 03: Databricks – Spark SCD Type 1. What is SCD Type 1 SCD stands for Slowly Changing Dimension, and it was explained in 10 Data warehouse interview Q&As. … Read more ›...
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04b: Databricks – Spark SCD Type 2 with Merge
Prerequisite: … Read more ›...
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05: 50+ SQL scenarios based interview Q&As on N items per group
This extends 15+ SQL scenarios based interview Q&As on Nth value – part 4. 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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05: Azure interview Q&As on Security
Q01. What is Azure Active Directory? A01 Azure Active Directory (i.e. AD) is a cloud-based identity and access management (i.e. IAM) solution that provides a centralised, secure, and scalable platform for managing identities, access control, … Read more ›...
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05: Databricks interview questions & answers – parquet data vs Delta lake
Q1. How will you convert parquet data to data lake in Databricks? A1. A parquet data will have a list of *.snappy.parquet files under each partition like year=2023, month=02, day-25, etc.
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%sql CONVERT TO DELTA parquet.`abfss://mycontainer@mystorageaccount.dfs.core.windows.net/user_detail` PARTITIONED BY (year STRING, month STRING, day STRING) |
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%python from delta.tables import * deltaTable = DeltaTable.convertToDelta(spark, "parquet.`abfss://mycontainer@mystorageaccount.dfs.core.windows.net/user_detail`", "year STRING, month STRING, day STRING") |
Q2. … Read more ›...
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