Given the partitioned table orders partitioned by range on order_date, what will the query SELECT * FROM orders WHERE order_date < '2023-01-01'; do?

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PostgreSQL - Table Partitioning

Given the partitioned table orders partitioned by range on order_date, what will the query SELECT * FROM orders WHERE order_date < '2023-01-01'; do?

AReturn an error because partition pruning is not supported

BScan all partitions regardless of date

CScan only the latest partition

DScan only partitions with order_date before 2023-01-01

Step-by-Step Solution

Solution:

Step 1: Understand partition pruning
PostgreSQL scans only relevant partitions based on query conditions.
Step 2: Apply to given query
Query filters order_date before 2023-01-01, so only partitions with those dates are scanned.
Final Answer:
Scan only partitions with order_date before 2023-01-01 -> Option D
Quick Check:
Partition pruning = Scan only partitions with order_date before 2023-01-01 [OK]

Quick Trick: Partition pruning scans only needed partitions [OK]

Common Mistakes:

Assuming all partitions are scanned
Thinking partition pruning causes errors
Believing only latest partition is scanned

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Given the partitioned table orders partitioned by range on order_date, what will the query SELECT * FROM orders WHERE order_date < '2023-01-01'; do?

Step 1: Understand partition pruning

Step 2: Apply to given query

Final Answer:

Quick Check:

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