SQL for Data Analysis
3 modules · 7 objectives · built from 6 sources, grouped by topic
3 objectives · 91%
3 objectives · 84%
Your sources disagree here“NULLs are excluded from COUNT(column)” — Relational databases · p. 22“COUNT always includes NULLs” — GROUP BY in 10 minutes · 4:10Both are shown; neither is hidden. Checks will avoid this point until you choose.
◌ Not covered yet
Not covered yet. Only one of your sources mentions window functions, in a single sentence — not enough to build checks. No checks will be created until coverage improves.
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