Given a materialized view mv_orders created from an orders table, what will be the result of running REFRESH MATERIALIZED VIEW mv_orders; if new orders were added after the last refresh?

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PostgreSQL - Views and Materialized Views

Given a materialized view mv_orders created from an orders table, what will be the result of running REFRESH MATERIALIZED VIEW mv_orders; if new orders were added after the last refresh?

AThe materialized view will include the new orders after refresh

BThe materialized view will remain unchanged and exclude new orders

CThe command will fail with an error because new data exists

DThe materialized view will be deleted and recreated

Step-by-Step Solution

Solution:

Step 1: Understand what refresh does
Refreshing updates the materialized view data to match current base table data.
Step 2: Effect of new data on refresh
New orders added after last refresh will be included after running the command.
Final Answer:
The materialized view will include the new orders after refresh -> Option A
Quick Check:
Refresh includes new data = The materialized view will include the new orders after refresh [OK]

Quick Trick: Refresh updates view with new base table data [OK]

Common Mistakes:

Thinking refresh does not update new data
Expecting errors if base table changed
Assuming refresh deletes the view

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Given a materialized view mv_orders created from an orders table, what will be the result of running REFRESH MATERIALIZED VIEW mv_orders; if new orders were added after the last refresh?

Step 1: Understand what refresh does

Step 2: Effect of new data on refresh

Final Answer:

Quick Check:

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