All Articles & Tutorials
Explore practical guides, step-by-step masterclasses, and foundational definitions across AI, SQL, and data systems — written in plain, human English.
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Power BI for beginners: how to write measures that answer your question
Name Power BI measures after the question, write DAX that respects filter context, and test before the card goes live. Columns are raw material; measures are answers.
When to look at A/B test results and when to stop the test
Stop peeking at interim p-values as final decisions. Use fixed horizons or sequential plans, guardrail metrics, and a written stopping rule before launch.
How a data catalog settles which copy of your company’s data is correct
Build a one-page truth map and a minimum catalog card for each critical dataset. Certification is a promise with an owner, not a sticker on a dashboard.
Can AI read your charts and screenshots? What it gets right and wrong
Use multimodal AI on charts with visible-only asks and uncertainty labels. Verify dips and drivers in the source data before you paste the model’s story into Slack.
How to share a Custom GPT with your team without causing chaos
Share Custom GPTs with one owner, one live version, and clear edit rights. Kill ghost copies before the team trusts disagreeing answers.
