This category is all about SQL interview questions and answers on different SQL concepts such as SQL Functions, Triggers, Commands, comparison concepts like difference between union and union all and difference between unique key and primary key e.t.c.
In this category, we have captured all important SQL concepts with practical examples.
I am sure any beginner can easily understand these concepts.
If you are preparing for an interview, these questions and answers can really boost your knowledge.
Some of them are very frequently asked interview questions such as rank, dense rank, partition e.t.c and some of them are advanced topics.
Google: How Do You Optimize a Power BI Data Model and DAX Queries to Perform Efficiently on Datasets Exceeding 200 Million Rows? Google is known for working with some of the largest datasets on the planet. Even internal BI and analytics teams handle billions of transactions, logs, events, impressions, and user interactions across Search, YouTube, … Read more
Amazon: How Do You Design a High-Performance Power BI Dashboard Using DirectQuery Without Causing High Query Latency? Amazon is known for building hyper-scalable, high-performance analytics solutions across departments such as Retail, AWS, Finance, Prime Video, Logistics, Supply Chain, Payments, and Marketplace Seller Analytics. Most Amazon BI teams use Power BI + DirectQuery on top of … Read more
Wipro: How Do You Convert a Fully Normalized ERP Dataset Into a Performance-Optimized Star Schema for Enterprise Reporting in Power BI? Wipro works with large global enterprises running complex ERP systems like SAP ECC, SAP S/4HANA, Oracle EBS, Microsoft Dynamics, Infor, and legacy mainframe-based systems. These ERP systems typically store their data in a highly … Read more
Cognizant: How Do You Build an Efficient ETL Workflow Using Azure Data Factory for High-Frequency Data Loads? Cognizant (CTS) is one of the world’s leading technology consulting companies, handling large-scale data engineering projects for enterprise clients in banking, healthcare, insurance, telecom, energy, and retail domains. Most Cognizant projects involve high-frequency, high-volume ETL pipelines where data … Read more
EY: How Do You Reduce Memory Footprint in Power BI When Importing Fact Tables Above 80 Million Rows? This is one of the most frequently asked questions in EY (Ernst & Young) Power BI, BI Architect, Data Engineering, and Analytics interviews. EY handles large-scale enterprise analytics implementations across banking, taxation, audit, insurance, global finance, supply … Read more
Deloitte: How Do You Design a Scalable SQL Schema for Financial Reporting With Daily, Monthly & Quarterly Aggregations? This question is frequently asked in Deloitte SQL Developer, Data Engineer, and BI Architect interviews. Deloitte’s financial analytics projects deal with extremely large datasets, multiple reporting cycles, regulatory requirements, and complex aggregations across daily, monthly, quarterly, and … Read more
TCS: How Do You Handle Complex DAX Measures When Your Power BI Model Has Circular Dependency Issues? In many TCS Power BI and Data Analyst interviews, candidates are asked how they deal with complex DAX measures that cause circular dependency errors. This is a practical question because real enterprise models often contain multiple measures, calculated … Read more
🧹 SQL Query to Remove Duplicate Records While Keeping the Latest Entry Duplicate data is one of the most common problems in database management. In this tutorial, you’ll learn how to remove duplicate records while keeping only the latest entry — based on a timestamp or unique ID. This technique works in MySQL, SQL Server, … Read more