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How would you create a materialized view for frequently accessed aggregated sales data?

SQLeasy0.2 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

CREATE MATERIALIZED VIEW mv_sales_agg AS SELECT region, product, SUM(amount) FROM sales GROUP BY region, product; **Refresh**: REFRESH MATERIALIZED VIEW mv_sales_agg; **Incremental**: Some systems (Snowflake, Delta) support incremental. **Schedule**: Cron or dbt. **Trade-off**:...

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Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
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1,863
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Expert Answer
44 words

CREATE MATERIALIZED VIEW mv_sales_agg AS SELECT region, product, SUM(amount) FROM sales GROUP BY region, product; Refresh: REFRESH MATERIALIZED VIEW mv_sales_agg; Incremental: Some systems (Snowflake, Delta) support incremental. Schedule: Cron or dbt. Trade-off: Refresh cost vs. query savings. Concurrent: REFRESH CONCURRENTLY (PostgreSQL) for no lock.

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Pro Tip

Red Flag: Full refresh during business hours—locks. Pro-Move: 'We refresh at 2am; CONCURRENTLY in Postgres—zero query blocking; 50× faster dashboard loads.'

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