Pre-Sort Order Data with a Materialized View

Create a Materialized View with Sorting

Write a PostgreSQL query to create a materialized view that returns orders sorted by order date.

Solution:

-- Create a materialized view that lists orders in descending order of order_date.
CREATE MATERIALIZED VIEW SortedOrders AS
SELECT order_id, order_date, customer_id
FROM Orders
ORDER BY order_date DESC;

Explanation:

• Purpose of the Query:
• The goal is to pre-store a sorted list of orders to speed up queries that require ordered data.
• This demonstrates using ORDER BY within a materialized view definition.
• Key Components:
• ORDER BY order_date DESC : Ensures that the orders are sorted by the most recent first.
• Real-World Application:
• Beneficial for applications where users frequently view the latest orders, such as order management systems.

Notes:

• Sorting is performed at refresh time; subsequent queries against the view benefit from the pre-sorted data.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to create a materialized view that sorts customer records by registration date in ascending order.
• Write a PostgreSQL query to create a materialized view that orders products by price in descending order from the Products table.
• Write a PostgreSQL query to create a materialized view that sorts event logs by timestamp from the Logs table, displaying the latest first.
• Write a PostgreSQL query to create a materialized view that orders employee records alphabetically by last name from the Employees table.

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