Tech Exam Prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to distinguish fact tables from dimension tables to establish optimal one-to-many relationships. - How to handle granularity mismatches across different fact tables without introducing calculation errors. - Why flattening snowflaked dimensions improves filter context propagation and VertiPaq compression. - How wide flat tables degrade Power BI model performance and break time intelligence capabilities. - How to resolve many-to-many modeling challenges without relying on risky bi-directional cross-filtering. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to handle composite keys by concatenating columns or creating numeric surrogate keys in Power Query - Why data types must strictly match across related tables to ensure stable model relationships - How unchecking Enable Load creates connection-only staging queries without breaking downstream references - When to disable Include in Report Refresh for static historical data to reduce refresh duration - A practical mnemonic to remember key modeling and query load rules on the PL-300 exam For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How Merge Queries joins tables horizontally using matching key columns, while Append Queries stacks tables vertically. - The six join kinds in Power Query Merge operations, including default Left Outer and audit-oriented Left Anti joins. - How duplicate key values in a Merge table cause row count expansion and row duplication traps on the exam. - Why Append Queries requires identical column names and case sensitivity to avoid extra null-filled columns. - Clear scenario triggers to instantly choose between horizontal column enrichment and vertical row consolidation. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How reference queries maintain parent-child lineage and automatically inherit upstream transformations in Power Query. - Why duplicate queries create independent M code scripts without ongoing dependencies or automatic updates from the original query. - Best practices for staging queries, including disabling load and referencing staging tables to build star schema fact and dimension tables. - Common PL-300 exam traps involving breaking changes in upstream queries and maintenance overhead in duplicated pipelines. - The mental shortcut Reference Remembers, Duplicate Disconnects to quickly solve query architectural scenarios on exam day. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to transform flat source data into fact and dimension tables in Power Query for the PL-300 exam - Why applying Remove Duplicates on dimension key columns is critical to prevent many-to-many relationships - How to establish and match correct granularity between fact and dimension tables - Key differences between referencing and duplicating queries when building data models - Common PL-300 exam traps involving query transformations and star schema design For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep