Interview Q&A / PostgreSQL
PostgreSQL interview questions
Indexes, EXPLAIN, transactions and isolation, JSONB and the Postgres specifics backend interviews probe.
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- What is the difference between ROW_NUMBER, RANK and DENSE_RANK?
All number rows in a window order. ROW_NUMBER gives unique numbers with no ties, RANK gives ties the same number and then skips ahead, and DENSE_RANK gives ties the same number without skipping.
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