Dr. C. Rani — Notes & PostsPlain-language posts on HR, analytics, teaching, and research from Dr. C. Rani.https://drcrani.com/en-inDuplicate and Reference Walk Into a Tea Stallhttps://drcrani.com/blog/duplicate-vs-reference/https://drcrani.com/blog/duplicate-vs-reference/Reena needs two new summary tables off her cleaned sales query. Power BI offers two options that look identical on the right-click menu — and her cousin warns that one of them will quietly break tomorrow.Thu, 07 May 2026 00:00:00 GMTAnalyticsdata-visualizationpower-bipower-querydata-modelingexplainerRani COne-to-Many and Many-to-Many Walk Into a Tea Stallhttps://drcrani.com/blog/one-to-many-vs-many-to-many/https://drcrani.com/blog/one-to-many-vs-many-to-many/Reena's Power BI report has thrown a yellow warning at her. One stranger arrives with an open fan. The other arrives with a tangled ball of yarn — and a small wooden plank.Thu, 07 May 2026 00:00:00 GMTAnalyticsdata-modelingpower-bidata-warehousingfundamentalsexplainerRani CCalculated Column and Measure Walk Into a Tea Stallhttps://drcrani.com/blog/calculated-column-vs-measure/https://drcrani.com/blog/calculated-column-vs-measure/Reena needs a Profit number for Sunday. Two strangers turn up — one who writes it into every row, one who keeps only the formula and presses a calculator when asked.Wed, 06 May 2026 00:00:00 GMTAnalyticsdata-visualizationpower-bidaxtableaudata-modelingexplainerRani CFact and Dimension Walk Into a Tea Stallhttps://drcrani.com/blog/fact-vs-dimension-table/https://drcrani.com/blog/fact-vs-dimension-table/Reena's notebook is bursting with repetition. Her cousin wants the data organised the proper way before he comes on Sunday. Two strangers know exactly how to split it.Thu, 30 Apr 2026 00:00:00 GMTAnalyticsdata-warehousingdata-modelingfundamentalsexplainerstar-schemaRani CSlicer and Filter Walk Into a Tea Stallhttps://drcrani.com/blog/slicers-vs-filters/https://drcrani.com/blog/slicers-vs-filters/Reena is preparing her slate for her cousin's visit. Some numbers should never be seen, some should be flipped through — and the difference is the difference between a filter and a slicer.Thu, 30 Apr 2026 00:00:00 GMTAnalyticsdata-visualizationpower-bitableaufundamentalsexplainerRani C