Data Analytics — Teaching & Interview Guides
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Data Analytics Interview Guide: Explain and Defend a SQL Portfolio
Prepare a small SQL case study you can explain, reconcile and test during an interview.
Read guide →Why Is My Average Wrong? Average of Averages versus Weighted Average
Resolve a common dashboard doubt with group sizes, a tested SQL example and a reconciliation exercise.
Read guide →Data Analytics Interview Q&A: WHERE, HAVING and Trustworthy Grouped Results
Answer SQL grouping interview questions with a tested query, boundary cases and reporting checks.
Read guide →Sales KPIs Explained: Row Grain, Duplicates and Reliable Totals
Learn how an order-line dataset becomes a trustworthy sales KPI, with SQL examples, expected totals and checks that prevent double counting.
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