Power BI 778 Study Guide 2026
Everything you need to pass the Power BI 778 exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 Power BI 778 Exam Format at a Glance
📚 Power BI 778 Topics to Study (23)
✍️ Sample Power BI 778 Questions & Answers
1. Which cardinality setting should you use when one row in Table A matches exactly one row in Table B?
A one-to-one relationship means each row in Table A has exactly one corresponding row in Table B.
2. What does 'Promote Headers' do in Power Query?
Promote Headers takes the first row of the dataset and converts it into the column header names.
3. What Power BI feature allows you to group numerical data into ranges for analysis?
Binning in Power BI groups continuous numerical data into defined ranges (bins) to simplify distribution analysis.
4. In DAX Studio's Server Timings pane, what does a disproportionately high Formula Engine (FE) time relative to Storage Engine (SE) time typically indicate?
High FE time indicates the DAX uses operations like row-by-row iteration (SUMX, FILTER) that the VertiPaq storage engine cannot satisfy with a simple column scan, requiring more formula engine cycles.
5. What does the Power BI Admin Portal allow tenant administrators to manage?
The Admin Portal gives Power BI tenant admins control over organization-wide settings, including export controls, sharing policies, and audit logs.
6. Which DAX function returns the number of distinct values in a column?
DISTINCTCOUNT counts the number of unique, non-blank values in a column.