Mukesh Singh

@sql-datatools

Approx 14+ years of experience in all aspects of database design, web development, ETL, SSIS, SSRS, SSAS, MDX, OLAP and OLTP, Data Warehouse with SQL Server (all versions) and Azure SQL database. SSRS integration with SharePoint Server, Tableau, and Power BI. Good understanding on big data by using Hadoop and Python. Data Integrations with Talend and Pentaho. NoSQL with MongoDB.

269 posts

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Top 5 Interview Questions for SQL Data Warehousing

Please keep in mind that these questions cover key concepts in SQL Data Warehouse design and implementation, including schema design, data modeling, and data aggregation.

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SQL - How to Use Rollup Operator to Calculate SubTotal and GrandTotal

As we know, ROLLUP is an extension of the SQL GROUP BY clause, used to generate summary reports with subtotals and grand totals. It helps in aggregating data at multiple levels of granularity.

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SQL Interview Questions — High Cardinality Vs Low Cardinality

In SQL, understanding the cardinality of columns is crucial for database design and query optimization. High cardinality columns are ideal candidates for indexing, while low cardinality columns might not benefit as much from indexing but can be useful for categorical data analysis.

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SQL Interview Questions - Row_Number() vs Rank() vs Dense_Rank()

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PySpark - Replace Accented letters with their Non-Accented letters

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Orchestration- Databricks Workflow VS Azure Data Factory

DataBricks- Delta Lake Saves Your Money in many ways

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