Aggregate Sales Data from 2022 and 2023 Partitions
Retrieve Data from Multiple Partitions
Write a PostgreSQL query to fetch sales records from 2022 and 2023 in a range-partitioned Sales table.
Solution:
-- Fetch sales records from 2022 and 2023.
SELECT * FROM Sales
-- Filter records with sale_date from January 1, 2022 up to but not including January 1, 2024.
WHERE sale_date >= '2022-01-01' AND sale_date < '2024-01-01';
Explanation:
- Purpose of the Query:
- Retrieves data from multiple partitions (Sales_2022 and Sales_2023).
- Key Components:
- The WHERE clause allows partition pruning.
- Real-World Application:
- Useful for analyzing data trends across multiple years.
Notes:
- Ensure that the date range aligns with the partitioning strategy.
For more Practice: Solve these Related Problems:
- Write a PostgreSQL query to retrieve data from two adjacent partitions using a BETWEEN clause on the partition key.
- Write a PostgreSQL query to fetch data from non-contiguous partitions by using an IN clause with specific partition key values.
- Write a PostgreSQL query to combine data from multiple partitions using UNION ALL while applying different filters to each partition.
- Write a PostgreSQL query to aggregate data across multiple partitions using GROUP BY and a date range that spans them.
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Previous PostgreSQL Exercise: Query Data using Partition Pruning.
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