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2 of 3 competencies · 4 receipts
Relational database basics91% · ↗ · Sep–Oct
№ 0171Describe what a foreign key does✓ LINKED
№ 0176Identify the primary key in a table✓ LINKED
Joins84% · ↗ · Oct
№ 0193What does a LEFT JOIN return when no row matches?✓ LINKED
№ 0198Applied task: monthly sales report◷ SOURCE CHANGED
Aggregation and grouping72% · → · Oct
№ 0205When should you use HAVING instead of WHERE?✓ LINKED

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Expires 14 Nov 2026 · 3 views · last opened 2 days ago
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