Optimize Sales Query for Customer 101 with Index Usage

Query Data using Index Scan on Partitioned Table

Write a PostgreSQL query to fetch all sales records of a specific customer_id = 101 from an indexed partitioned Sales table.

Solution:

-- Fetch sales records for customer_id 101.
SELECT * FROM Sales 
-- Filter records where the customer_id is 101.
WHERE customer_id = 101;

Explanation:

• Purpose of the Query:
• Uses indexing to quickly fetch data for a specific customer.
• Key Components:
• WHERE customer_id = 101: Helps PostgreSQL use indexes efficiently.
• Real-World Application:
• Optimized queries improve performance on large partitioned tables.

Notes:

• Ensure indexing is enabled on the partitioned table and its partitions.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to fetch records from a partitioned table using a composite index on both the partition key and another column.
• Write a PostgreSQL query to retrieve data from a partitioned table that forces an index scan on a specific indexed column.
• Write a PostgreSQL query to fetch records using an index scan combined with an ORDER BY clause on the partitioning key.
• Write a PostgreSQL query to retrieve data for a given value on an indexed column in a partitioned table, ensuring optimal index utilization.

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Previous PostgreSQL Exercise: Count Records in Each Partition.