Quiz · 5 questions
📝 Queries
SELECT, joins, aggregation, windows, CTEs
Level 0Schema Seedling
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Quiz
01What does the RETURNING clause do in PostgreSQL?
02Why does
NOT IN with a NULLable subquery return zero rows?03What does
COALESCE(a, b, c) return?04Why is OFFSET-based pagination slow at scale?
05Which window function gives unique sequential numbers with no ties?
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